Re: [JSch-users] SFTP of large file hangs

[Vikas Verma]

Yeah looks like a similar issue. But I am not familiar with JSCH source code to 
figure out how to change that to make it work.



From: Alan Ezust <alan.ez...@gmail.com>
Sent: Friday, October 14, 2016 12:55 PM
To: Vikas Verma
Cc: jsch-users@lists.sourceforge.net
Subject: Re: [JSch-users] SFTP of large file hangs

I had to google to figure out what "rekeying" means and came across this 
interesting thread
about a similar problem the paramiko client used to have at 1gb.

https://github.com/paramiko/paramiko/issues/49
[https://avatars1.githubusercontent.com/u/1007176?v=3=400]<https://github.com/paramiko/paramiko/issues/49>

Transfer fails at 1GB: rekey window too small, hard-coded 
...<https://github.com/paramiko/paramiko/issues/49>
github.com
First off, thanks for the great work with paramiko. At 1GB of data transferred 
over sftp, paramiko initiates a ssh rekey request and then sets a limit on the 
number ...







--
Check out the vibrant tech community on one of the world's most 
engaging tech sites, SlashDot.org! http://sdm.link/slashdot___
JSch-users mailing list
JSch-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/jsch-users

Re: [JSch-users] SFTP of large file hangs

[Vikas Verma]

I have also verified that changing  SFTPRekey parameter to "none" on the 
ProFTPD server configuration fixes the issue. So the issue definitely is that 
JSCH is unable to handle Rekeying from the SFTP server. Any idea how I can fix 
this?

Help truly appreciated.


Thanks,

Vikas.


From: Vikas Verma <vvick...@hotmail.com>
Sent: Monday, October 10, 2016 12:38:28 PM
To: Alan Ezust
Cc: jsch-users@lists.sourceforge.net
Subject: Re: [JSch-users] SFTP of large file hangs


I just tried java -Xmx4096m -classpath "*" Sftp and it still fails. Looking at 
the change logs I see that there was a Rekeying issue with ProFTPD server but 
supposedly it was fixed in version 53. I have already tested with both 53 and 
54 but no luck.


Thanks,

Vikas.





From: Alan Ezust <alan.ez...@gmail.com>
Sent: Monday, October 10, 2016 12:09 PM
To: Vikas Verma
Cc: jsch-users@lists.sourceforge.net
Subject: Re: [JSch-users] SFTP of large file hangs


Another guess: investigate what the startup command line options are for java 
on the system in question.
Is the max heap size limited with an -Xmx option? Or is there a -d32 being 
passed in?



On Mon, Oct 10, 2016 at 8:26 AM, Vikas Verma 
<vvick...@hotmail.com<mailto:vvick...@hotmail.com>> wrote:

I was able to reproduce this in our local environment. We were able to setup 
ProFTPD SFTP server with default settings. After transferring about 2GB of data 
(using jsch) the transfer stops. I am attaching the ProFTPD logs for reference. 
Please help.


Thanks,

Vikas.


From: Vikas Verma <vvick...@hotmail.com<mailto:vvick...@hotmail.com>>
Sent: Wednesday, October 5, 2016 11:40:47 AM
To: Alan Ezust

Cc: jsch-users@lists.sourceforge.net<mailto:jsch-users@lists.sourceforge.net>
Subject: Re: [JSch-users] SFTP of large file hangs


@Alan --> Yes its running 64 bit.

@Lothar --> The problem is just between Proftpd and JSCH. I am able to transfer 
huge files (> 4gb) to other SFTP servers from JSCH. And Proftpd works fine with 
other ssh clients (like the one that comes with linux). I am not sure sure 
about their (Partner that hosts sftp server) logging. I can reach out and ask. 
But their support isnt that great.


Thanks,

Vikas.


From: Alan Ezust <alan.ez...@gmail.com<mailto:alan.ez...@gmail.com>>
Sent: Wednesday, October 5, 2016 11:00:44 AM
To: Vikas Verma
Cc: jsch-users@lists.sourceforge.net<mailto:jsch-users@lists.sourceforge.net>
Subject: Re: [JSch-users] SFTP of large file hangs

Just wondering, is the client running jsch also running a 64 bit version of 
Java?


On Mon, Oct 3, 2016 at 12:19 PM, Vikas Verma 
<vvick...@hotmail.com<mailto:vvick...@hotmail.com>> wrote:

Can anyone please help? The SFTP server is proftpd. This looks like an old 
Rekeying problem between Proftpd and Jsch. I have tried JSCH version 50/51 and 
54 with no luck.


Thanks,

Vikas.


From: Vikas Verma <vvick...@hotmail.com<mailto:vvick...@hotmail.com>>
Sent: Wednesday, September 14, 2016 11:43:16 AM
To: jsch-users@lists.sourceforge.net<mailto:jsch-users@lists.sourceforge.net>
Subject: SFTP of large file hangs


We are having a strange issue with one of our clients (Client hosts the SFTP 
server. We are the client using JSCH). When we SFTP a large file to their SFTP 
server the file stops getting uploaded after exactly 2143990632 
bytes. The JSCH connection just starts over at that point. I am including the 
logs. Has anyone seen this behavior before? I can use any other SFTP client 
with that server and they work.

In the logs you will see that after my custom log prints (3 and 4) it starts 
putting the file. After sending 2143990632 bytes it kind of 
starts over and the highlighted log shows up. The file at that point does not 
"grow" in size on the server side.

Help truly appreciated !!

Thanks,
Vikas.


INFO: Connecting to xxx.xxx.xxx.xx port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-mod_sftp/0.9.7
INFO: Local version string: SSH-2.0-JSCH-0.1.53
INFO: CheckCiphers: 
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: CheckKexes: 
diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: CheckSignatures: 
ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: 
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,rsa1024-sha1
INFO: kex: server: ssh-rsa,ssh-dss
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-c

Re: [JSch-users] SFTP of large file hangs

[Vikas Verma]

I just tried java -Xmx4096m -classpath "*" Sftp and it still fails. Looking at 
the change logs I see that there was a Rekeying issue with ProFTPD server but 
supposedly it was fixed in version 53. I have already tested with both 53 and 
54 but no luck.


Thanks,

Vikas.





From: Alan Ezust <alan.ez...@gmail.com>
Sent: Monday, October 10, 2016 12:09 PM
To: Vikas Verma
Cc: jsch-users@lists.sourceforge.net
Subject: Re: [JSch-users] SFTP of large file hangs


Another guess: investigate what the startup command line options are for java 
on the system in question.
Is the max heap size limited with an -Xmx option? Or is there a -d32 being 
passed in?



On Mon, Oct 10, 2016 at 8:26 AM, Vikas Verma 
<vvick...@hotmail.com<mailto:vvick...@hotmail.com>> wrote:

I was able to reproduce this in our local environment. We were able to setup 
ProFTPD SFTP server with default settings. After transferring about 2GB of data 
(using jsch) the transfer stops. I am attaching the ProFTPD logs for reference. 
Please help.


Thanks,

Vikas.


From: Vikas Verma <vvick...@hotmail.com<mailto:vvick...@hotmail.com>>
Sent: Wednesday, October 5, 2016 11:40:47 AM
To: Alan Ezust

Cc: jsch-users@lists.sourceforge.net<mailto:jsch-users@lists.sourceforge.net>
Subject: Re: [JSch-users] SFTP of large file hangs


@Alan --> Yes its running 64 bit.

@Lothar --> The problem is just between Proftpd and JSCH. I am able to transfer 
huge files (> 4gb) to other SFTP servers from JSCH. And Proftpd works fine with 
other ssh clients (like the one that comes with linux). I am not sure sure 
about their (Partner that hosts sftp server) logging. I can reach out and ask. 
But their support isnt that great.


Thanks,

Vikas.


From: Alan Ezust <alan.ez...@gmail.com<mailto:alan.ez...@gmail.com>>
Sent: Wednesday, October 5, 2016 11:00:44 AM
To: Vikas Verma
Cc: jsch-users@lists.sourceforge.net<mailto:jsch-users@lists.sourceforge.net>
Subject: Re: [JSch-users] SFTP of large file hangs

Just wondering, is the client running jsch also running a 64 bit version of 
Java?


On Mon, Oct 3, 2016 at 12:19 PM, Vikas Verma 
<vvick...@hotmail.com<mailto:vvick...@hotmail.com>> wrote:

Can anyone please help? The SFTP server is proftpd. This looks like an old 
Rekeying problem between Proftpd and Jsch. I have tried JSCH version 50/51 and 
54 with no luck.


Thanks,

Vikas.


From: Vikas Verma <vvick...@hotmail.com<mailto:vvick...@hotmail.com>>
Sent: Wednesday, September 14, 2016 11:43:16 AM
To: jsch-users@lists.sourceforge.net<mailto:jsch-users@lists.sourceforge.net>
Subject: SFTP of large file hangs


We are having a strange issue with one of our clients (Client hosts the SFTP 
server. We are the client using JSCH). When we SFTP a large file to their SFTP 
server the file stops getting uploaded after exactly 2143990632 
bytes. The JSCH connection just starts over at that point. I am including the 
logs. Has anyone seen this behavior before? I can use any other SFTP client 
with that server and they work.

In the logs you will see that after my custom log prints (3 and 4) it starts 
putting the file. After sending 2143990632 bytes it kind of 
starts over and the highlighted log shows up. The file at that point does not 
"grow" in size on the server side.

Help truly appreciated !!

Thanks,
Vikas.


INFO: Connecting to xxx.xxx.xxx.xx port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-mod_sftp/0.9.7
INFO: Local version string: SSH-2.0-JSCH-0.1.53
INFO: CheckCiphers: 
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: CheckKexes: 
diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: CheckSignatures: 
ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: 
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,rsa1024-sha1
INFO: kex: server: ssh-rsa,ssh-dss
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: z...@openssh.com<mailto:z...@openssh.com>,zlib,none
INFO: kex: server: z...@openssh.com<mailto:z...@openssh.com>

Re: [JSch-users] SFTP of large file hangs

[Alan Ezust]

Another guess: investigate what the startup command line options are for
java on the system in question.
Is the max heap size limited with an -Xmx option? Or is there a -d32 being
passed in?



On Mon, Oct 10, 2016 at 8:26 AM, Vikas Verma <vvick...@hotmail.com> wrote:

> I was able to reproduce this in our local environment. We were able to
> setup ProFTPD SFTP server with default settings. After transferring about
> 2GB of data (using jsch) the transfer stops. I am attaching the ProFTPD
> logs for reference. Please help.
>
>
> Thanks,
>
> Vikas.
> --
> *From:* Vikas Verma <vvick...@hotmail.com>
> *Sent:* Wednesday, October 5, 2016 11:40:47 AM
> *To:* Alan Ezust
>
> *Cc:* jsch-users@lists.sourceforge.net
> *Subject:* Re: [JSch-users] SFTP of large file hangs
>
>
> @Alan --> Yes its running 64 bit.
>
> @Lothar --> The problem is just between Proftpd and JSCH. I am able to
> transfer huge files (> 4gb) to other SFTP servers from JSCH. And Proftpd
> works fine with other ssh clients (like the one that comes with linux). I
> am not sure sure about their (Partner that hosts sftp server) logging. I
> can reach out and ask. But their support isnt that great.
>
>
> Thanks,
>
> Vikas.
> --
> *From:* Alan Ezust <alan.ez...@gmail.com>
> *Sent:* Wednesday, October 5, 2016 11:00:44 AM
> *To:* Vikas Verma
> *Cc:* jsch-users@lists.sourceforge.net
> *Subject:* Re: [JSch-users] SFTP of large file hangs
>
> Just wondering, is the client running jsch also running a 64 bit version
> of Java?
>
>
> On Mon, Oct 3, 2016 at 12:19 PM, Vikas Verma <vvick...@hotmail.com> wrote:
>
>> Can anyone please help? The SFTP server is proftpd. This looks like an
>> old Rekeying problem between Proftpd and Jsch. I have tried JSCH version
>> 50/51 and 54 with no luck.
>>
>>
>> Thanks,
>>
>> Vikas.
>> --
>> *From:* Vikas Verma <vvick...@hotmail.com>
>> *Sent:* Wednesday, September 14, 2016 11:43:16 AM
>> *To:* jsch-users@lists.sourceforge.net
>> *Subject:* SFTP of large file hangs
>>
>>
>> We are having a strange issue with one of our clients (Client hosts the
>> SFTP server. We are the client using JSCH). When we SFTP a large file to
>> their SFTP server the file stops getting uploaded after exactly
>> 2143990632 bytes. The JSCH connection just starts over at that point. I
>> am including the logs. Has anyone seen this behavior before? I can use any
>> other SFTP client with that server and they work.
>>
>> In the logs you will see that after my custom log prints (3 and 4) it
>> starts putting the file. After sending 2143990632 bytes it kind of
>> starts over and the highlighted log shows up. The file at that point does
>> not "grow" in size on the server side.
>>
>> Help truly appreciated !!
>>
>> Thanks,
>> Vikas.
>>
>>
>> INFO: Connecting to xxx.xxx.xxx.xx port 22
>> INFO: Connection established
>> INFO: Remote version string: SSH-2.0-mod_sftp/0.9.7
>> INFO: Local version string: SSH-2.0-JSCH-0.1.53
>> INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-c
>> tr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour
>> 128,arcfour256
>> INFO: aes256-ctr is not available.
>> INFO: aes192-ctr is not available.
>> INFO: aes256-cbc is not available.
>> INFO: aes192-cbc is not available.
>> INFO: CheckKexes: diffie-hellman-group14-sha1,ec
>> dh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
>> INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2
>> -nistp384,ecdsa-sha2-nistp521
>> INFO: SSH_MSG_KEXINIT sent
>> INFO: SSH_MSG_KEXINIT received
>> INFO: kex: server: diffie-hellman-group-exchange-
>> sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-gro
>> up14-sha1,diffie-hellman-group1-sha1,rsa1024-sha1
>> INFO: kex: server: ssh-rsa,ssh-dss
>> INFO: kex: server: aes256-ctr,aes192-ctr,aes128-c
>> tr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour2
>> 56,arcfour128,3des-ctr,3des-cbc
>> INFO: kex: server: aes256-ctr,aes192-ctr,aes128-c
>> tr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour2
>> 56,arcfour128,3des-ctr,3des-cbc
>> INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md
>> 5,hmac-md5-96,hmac-ripemd160
>> INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md
>> 5,hmac-md5-96,hmac-ripemd160
>> INFO: kex: server: z...@openssh.com,zlib,none
>> INFO: kex: server: z...@openssh.com,zlib,none
>> INFO: kex: server:
>> INFO: kex: server:
>> INFO: kex: client: ecd

Re: [JSch-users] SFTP of large file hangs

[Vikas Verma]

@Alan --> Yes its running 64 bit.

@Lothar --> The problem is just between Proftpd and JSCH. I am able to transfer 
huge files (> 4gb) to other SFTP servers from JSCH. And Proftpd works fine with 
other ssh clients (like the one that comes with linux). I am not sure sure 
about their (Partner that hosts sftp server) logging. I can reach out and ask. 
But their support isnt that great.


Thanks,

Vikas.


From: Alan Ezust <alan.ez...@gmail.com>
Sent: Wednesday, October 5, 2016 11:00:44 AM
To: Vikas Verma
Cc: jsch-users@lists.sourceforge.net
Subject: Re: [JSch-users] SFTP of large file hangs

Just wondering, is the client running jsch also running a 64 bit version of 
Java?


On Mon, Oct 3, 2016 at 12:19 PM, Vikas Verma 
<vvick...@hotmail.com<mailto:vvick...@hotmail.com>> wrote:

Can anyone please help? The SFTP server is proftpd. This looks like an old 
Rekeying problem between Proftpd and Jsch. I have tried JSCH version 50/51 and 
54 with no luck.


Thanks,

Vikas.


From: Vikas Verma <vvick...@hotmail.com<mailto:vvick...@hotmail.com>>
Sent: Wednesday, September 14, 2016 11:43:16 AM
To: jsch-users@lists.sourceforge.net<mailto:jsch-users@lists.sourceforge.net>
Subject: SFTP of large file hangs


We are having a strange issue with one of our clients (Client hosts the SFTP 
server. We are the client using JSCH). When we SFTP a large file to their SFTP 
server the file stops getting uploaded after exactly 2143990632 
bytes. The JSCH connection just starts over at that point. I am including the 
logs. Has anyone seen this behavior before? I can use any other SFTP client 
with that server and they work.

In the logs you will see that after my custom log prints (3 and 4) it starts 
putting the file. After sending 2143990632 bytes it kind of 
starts over and the highlighted log shows up. The file at that point does not 
"grow" in size on the server side.

Help truly appreciated !!

Thanks,
Vikas.


INFO: Connecting to xxx.xxx.xxx.xx port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-mod_sftp/0.9.7
INFO: Local version string: SSH-2.0-JSCH-0.1.53
INFO: CheckCiphers: 
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: CheckKexes: 
diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: CheckSignatures: 
ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: 
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,rsa1024-sha1
INFO: kex: server: ssh-rsa,ssh-dss
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: z...@openssh.com<mailto:z...@openssh.com>,zlib,none
INFO: kex: server: z...@openssh.com<mailto:z...@openssh.com>,zlib,none
INFO: kex: server:
INFO: kex: server:
INFO: kex: client: 
ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
INFO: kex: client: 
ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: none
INFO: kex: client: none
INFO: kex: client:
INFO: kex: client:
INFO: kex: server->client aes128-ctr hmac-md5 none
INFO: kex: client->server aes128-ctr hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
WARN: Permanently added 'xxx.xxx.xxx.xx' (RSA) to the list of known hosts.
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT received
INFO: Authentications that can continue: publickey,keyboard-interactive,password
INFO: Next authentication method: publickey
INFO: Authentications that can continue: password
INFO: Next authentication method: password
INFO: Authentication succeeded (password).
---3
---4
IN

Re: [JSch-users] SFTP of large file hangs

[Alan Ezust]

Just wondering, is the client running jsch also running a 64 bit version of
Java?


On Mon, Oct 3, 2016 at 12:19 PM, Vikas Verma  wrote:

> Can anyone please help? The SFTP server is proftpd. This looks like an
> old Rekeying problem between Proftpd and Jsch. I have tried JSCH version
> 50/51 and 54 with no luck.
>
>
> Thanks,
>
> Vikas.
> --
> *From:* Vikas Verma 
> *Sent:* Wednesday, September 14, 2016 11:43:16 AM
> *To:* jsch-users@lists.sourceforge.net
> *Subject:* SFTP of large file hangs
>
>
> We are having a strange issue with one of our clients (Client hosts the
> SFTP server. We are the client using JSCH). When we SFTP a large file to
> their SFTP server the file stops getting uploaded after exactly 2143990632
> bytes. The JSCH connection just starts over at that point. I am including
> the logs. Has anyone seen this behavior before? I can use any other SFTP
> client with that server and they work.
>
> In the logs you will see that after my custom log prints (3 and 4) it
> starts putting the file. After sending 2143990632 bytes it kind of starts
> over and the highlighted log shows up. The file at that point does not
> "grow" in size on the server side.
>
> Help truly appreciated !!
>
> Thanks,
> Vikas.
>
>
> INFO: Connecting to xxx.xxx.xxx.xx port 22
> INFO: Connection established
> INFO: Remote version string: SSH-2.0-mod_sftp/0.9.7
> INFO: Local version string: SSH-2.0-JSCH-0.1.53
> INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-
> ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,
> arcfour128,arcfour256
> INFO: aes256-ctr is not available.
> INFO: aes192-ctr is not available.
> INFO: aes256-cbc is not available.
> INFO: aes192-cbc is not available.
> INFO: CheckKexes: diffie-hellman-group14-sha1,
> ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
> INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-
> nistp521
> INFO: SSH_MSG_KEXINIT sent
> INFO: SSH_MSG_KEXINIT received
> INFO: kex: server: diffie-hellman-group-exchange-
> sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-
> group14-sha1,diffie-hellman-group1-sha1,rsa1024-sha1
> INFO: kex: server: ssh-rsa,ssh-dss
> INFO: kex: server: aes256-ctr,aes192-ctr,aes128-
> ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,
> arcfour256,arcfour128,3des-ctr,3des-cbc
> INFO: kex: server: aes256-ctr,aes192-ctr,aes128-
> ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,
> arcfour256,arcfour128,3des-ctr,3des-cbc
> INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-
> md5,hmac-md5-96,hmac-ripemd160
> INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-
> md5,hmac-md5-96,hmac-ripemd160
> INFO: kex: server: z...@openssh.com,zlib,none
> INFO: kex: server: z...@openssh.com,zlib,none
> INFO: kex: server:
> INFO: kex: server:
> INFO: kex: client: ecdh-sha2-nistp256,ecdh-sha2-
> nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha1,
> diffie-hellman-group-exchange-sha256,diffie-hellman-group-
> exchange-sha1,diffie-hellman-group1-sha1
> INFO: kex: client: ssh-rsa,ssh-dss,ecdsa-sha2-
> nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
> INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
> INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
> INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-
> 256,hmac-sha1-96,hmac-md5-96
> INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-
> 256,hmac-sha1-96,hmac-md5-96
> INFO: kex: client: none
> INFO: kex: client: none
> INFO: kex: client:
> INFO: kex: client:
> INFO: kex: server->client aes128-ctr hmac-md5 none
> INFO: kex: client->server aes128-ctr hmac-md5 none
> INFO: SSH_MSG_KEXDH_INIT sent
> INFO: expecting SSH_MSG_KEXDH_REPLY
> INFO: ssh_rsa_verify: signature true
> WARN: Permanently added 'xxx.xxx.xxx.xx' (RSA) to the list of known hosts.
> INFO: SSH_MSG_NEWKEYS sent
> INFO: SSH_MSG_NEWKEYS received
> INFO: SSH_MSG_SERVICE_REQUEST sent
> INFO: SSH_MSG_SERVICE_ACCEPT received
> INFO: Authentications that can continue: publickey,keyboard-
> interactive,password
> INFO: Next authentication method: publickey
> INFO: Authentications that can continue: password
> INFO: Next authentication method: password
> INFO: Authentication succeeded (password).
> ---3
> ---4
> INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-
> ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,
> arcfour128,arcfour256
> INFO: aes256-ctr is not available.
> INFO: aes192-ctr is not available.
> INFO: aes256-cbc is not available.
> INFO: aes192-cbc is not available.
> INFO: CheckKexes: diffie-hellman-group14-sha1,
> ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
> INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-
> nistp521
> INFO: SSH_MSG_KEXINIT sent
> INFO: kex: server: diffie-hellman-group-exchange-
> sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-
> 

[JSch-users] SFTP of large file hangs

[Vikas Verma]

We are having a strange issue with one of our clients (Client hosts the SFTP 
server. We are the client using JSCH). When we SFTP a large file to their SFTP 
server the file stops getting uploaded after exactly 2143990632 bytes. The JSCH 
connection just starts over at that point. I am including the logs. Has anyone 
seen this behavior before? I can use any other SFTP client with that server and 
they work.

In the logs you will see that after my custom log prints (3 and 4) it starts 
putting the file. After sending 2143990632 bytes it kind of starts over and the 
highlighted log shows up. The file at that point does not "grow" in size on the 
server side.

Help truly appreciated !!

Thanks,
Vikas.


INFO: Connecting to xxx.xxx.xxx.xx port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-mod_sftp/0.9.7
INFO: Local version string: SSH-2.0-JSCH-0.1.53
INFO: CheckCiphers: 
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: CheckKexes: 
diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: CheckSignatures: 
ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: 
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,rsa1024-sha1
INFO: kex: server: ssh-rsa,ssh-dss
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: z...@openssh.com,zlib,none
INFO: kex: server: z...@openssh.com,zlib,none
INFO: kex: server:
INFO: kex: server:
INFO: kex: client: 
ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
INFO: kex: client: 
ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: none
INFO: kex: client: none
INFO: kex: client:
INFO: kex: client:
INFO: kex: server->client aes128-ctr hmac-md5 none
INFO: kex: client->server aes128-ctr hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
WARN: Permanently added 'xxx.xxx.xxx.xx' (RSA) to the list of known hosts.
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT received
INFO: Authentications that can continue: publickey,keyboard-interactive,password
INFO: Next authentication method: publickey
INFO: Authentications that can continue: password
INFO: Next authentication method: password
INFO: Authentication succeeded (password).
---3
---4
INFO: CheckCiphers: 
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: CheckKexes: 
diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: CheckSignatures: 
ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: kex: server: 
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,rsa1024-sha1
INFO: kex: server: ssh-rsa,ssh-dss
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: 
aes256-ctr,aes192-ctr,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,cast128-cbc,arcfour256,arcfour128,3des-ctr,3des-cbc
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,hmac-ripemd160
INFO: kex: server: z...@openssh.com,zlib,none
INFO: kex: server: z...@openssh.com,zlib,none
INFO: kex: server:
INFO: kex: server:
INFO: kex: client: