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https://issues.apache.org/jira/browse/SSHD-1265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17530753#comment-17530753
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Sreedhar J commented on SSHD-1265:
----------------------------------

some more inputs.  on client side, all connections are closed.  But Server 
side, few ports are still in ESTABLISHED state.  I took one port and looked 
into the server logs.  here is the output
02 May 2022 19:40:05,902 [sshd-SshServer[2b1b1967](port=59119)-nio2-thread-7] 
DEBUG Nio2Session  - Creating IoSession on /10.15.102.66:59119 from 
/10.84.45.195:49518 via /0:0:0:0:0:0:0:0:59119
02 May 2022 19:40:05,902 [sshd-SshServer[2b1b1967](port=59119)-nio2-thread-7] 
DEBUG SessionTimeoutListener  - 
sessionCreated(ServerSessionImpl[null@/10.84.45.195:49518]) tracking
02 May 2022 19:40:05,902 [sshd-SshServer[2b1b1967](port=59119)-nio2-thread-7] 
DEBUG ServerSessionImpl  - 
sendIdentification(ServerSessionImpl[null@/10.84.45.195:49518]): SSH-2.0-SFTP 
2.0 Server
02 May 2022 19:40:05,902 [sshd-SshServer[2b1b1967](port=59119)-nio2-thread-7] 
DEBUG Nio2Session  - writeBuffer(Nio2Session[local=/10.15.102.66:59119, 
remote=/10.84.45.195:49518]) writing 25 bytes


If you see above,  Server has sent it's identificaiton, but there is no 
response from Client.

> maximum number of concurrent connections to SFTP Server?
> --------------------------------------------------------
>
>                 Key: SSHD-1265
>                 URL: https://issues.apache.org/jira/browse/SSHD-1265
>             Project: MINA SSHD
>          Issue Type: Question
>            Reporter: Sreedhar J
>            Priority: Major
>
> as part of my performance test, I am sending 180 concurrent requests to 
> Apache SFTP Server, but I can got the test completed.  around 10 to 15 
> requests gets timed out.   Are there any known tuning properties on the 
> SSHD/SFTP Server  which increases the concurrent connecttion request 
> processing.
> Also, Anyone has some data around max concurrent connections?  



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