>> You could try un-commenting that entry and re-starting sshd before doing the scan.
I meant to say, un-comment that entry and change the parameter from 'yes' to 'no'. ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Scherff Sent: Tuesday, January 16, 2007 10:32 AM To: Thomas Nguyen Van; [email protected] Subject: RE: SSH Credentials problem Thomas, Generally, items that are commented out in sshd_config are shown with their default settings. This probably means your sshd is doing reverse-map checking. You could try un-commenting that entry and re-starting sshd before doing the scan. On top of that, ReverseMappingCheck has been deprecated, so either your sshd is old (bad) or your config file is just a carry-over from an old version (not-so-bad). You should definitely check your version of sshd and apply any available patches. There are a few things you can get away with not patching for a long time, but SSH ain't one of them. Finally, you could also try putting your scanning server in /etc/hosts. And I definitely concur with Ron Gula on putting sshd into debug mode for troubleshooting purposes. Good luck, John ________________________________ From: Thomas Nguyen Van [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 16, 2007 6:35 AM To: John Scherff; [email protected] Subject: RE: SSH Credentials problem Afternoon John, Sorry for the delay and below my answers to your questions in green. Thanks for all. Thomas Nguyen Van (CEH) | OneIT Technical Security Consultant | OneIT Operations | BT | E: [EMAIL PROTECTED] |Mobile: +353 86 1720 692 | Fax: +353 1 432 5899| www.btireland.com -----Original Message----- From: John Scherff [mailto:[EMAIL PROTECTED] Sent: 15 January 2007 18:14 To: Thomas Nguyen Van; [email protected] Subject: RE: SSH Credentials problem Thomas, Does your Nessus scanner have a PTR record (reverse-map entry) in the DNS? > There is no PTR record and no DNS is defined. > cat /etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 myserver localhost.localdomain localhost Some implementations of sshd have a bug wherein you can't turn off reverse-map checking (setting 'ReverseMappingCheck' to 'no' in the sshd_config file has no effect). > grep -i "reverse" /etc/ssh/sshd_config #ReverseMappingCheck yes Also, are you doing anything with TCP wrappers on the target? > I'm not familiar with TCP wrappers. Could you precise your idea, please? John Scherff ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Thomas Nguyen Van Sent: Tuesday, December 19, 2006 8:26 AM To: '[email protected]' Subject: RE: SSH Credentials problem Good afternoon, In addition to my previous mail of today, I would like to add those information: We did the following tests: Test 1 - Manual SSH connection to IP_Nessus_Target with password: Ok Test 2 - Manual SSH connection to IP_Nessus_Target with public/private keys: Ok Test 3 - Nessus SSH connection to IP_Nessus_Target with password: Ok Test 4 - Nessus SSH connection to IP_Nessus_Target with public/private keys: Failed The analyse of the /var/adm/messages file on IP_Nessus_Target showed that: Dec 19 16:05:55 IP_Nessus_Target sshd[13422]: [ID 800047 auth.info] Did not receive ident string from IP_Nessus_Scanner. Dec 19 16:05:56 IP_Nessus_Target sshd[13423]: [ID 800047 auth.info] Could not reverse map address IP_Nessus_Scanner. Dec 19 16:05:56 IP_Nessus_Target sshd[13423]: [ID 800047 auth.info] Connection closed by IP_Nessus_Scanner Dec 19 16:06:01 IP_Nessus_Target sshd[13424]: [ID 800047 auth.info] Could not reverse map address IP_Nessus_Scanner. Dec 19 16:06:01 IP_Nessus_Target sshd[13424]: [ID 800047 auth.info] Connection closed by IP_Nessus_Scanner Dec 19 16:06:01 IP_Nessus_Target sshd[13425]: [ID 800047 auth.info] Did not receive ident string from IP_Nessus_Scanner. Do you know why I read the message "Did not receive ident string from IP_Nessus_Scanner." on the Nessus_Target? Many thanks in advance Regards, Thomas -----Original Message----- From: Thomas Nguyen Van Sent: 19 December 2006 13:04 To: '[email protected]' Subject: SSH Credentials problem Good afternoon, I checked your Nessus' FAQ before calling you (http://mail.nessus.org/pipermail/nessus/2006-September/msg00186.html) and I have quiet the same problem as JeanPaul. Actually, I activated the plugins "Local Checks Failed" (21745) and scanned a solaris server. On the /var/log/message file, I can see that nessus account was able to connect on the target server: Dec 19 13:01:09 Server_Target sshd[7724]: [ID 800047 auth.info] Accepted publickey for nessus_account from nessus_server port 56364 ssh2 However, when I checked the .nbe file, I got the error message associated to the plugin 21745 and I can't get any information like security holes or general information with the plugin 12634. I would really appreciate a clue to understand what happened. 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