AIX

Hey,

I have upgraded 3 servers from SSH Tectia 4.0.3 to SSH Tectia 6.0.2. 2 of them are working fine but one server suddenly began to have troubles after about 2 hours. Now it is impossible to login to this server using SSH and even telnet. When SSH is running on this particular server, the CPU of the server is at it's maximum because of the SSH processes, which is not the case on the other 2 servers. Currently I have shut down the SSH processes on the server.

Then, when I try to make a connection using telnet it immediatly replies: 'Connection closed'. The strange fact however is that telnet refuses a connection done by the root user, but if I try it using another user, telnet works fine. (SSH doen't work in either case though) Restarting and even reinstalling SSH also didn't work. After SSH was uninstalled I tried another telnet connection but still it didn't work.

I've checked /etc/security/user, because of the telnet/root problem, but everything looks identical to the configuration of the other 2 servers. Can anyone help me with this problem?

Thank you

Many servers dont allow root connection except from console...
Have you checked? What OS?

I use IBM AIX 5.3 as OS.

I have removed the new SSH version and replaced it again with the old version. Some of the problems are fixed. SSH is possible again, but not for the root user. Telnet also works but again, not for the root user.

When trying a SSH connection as root the following error occures:
Authentication successful.
Received signal 11. (no core)

After this error the connection failes again. Does anyone has an idea of what this problem might be?

Thanks.

Since your issue seems to be more AIX specific, I will if you agree move your post to that group...
Ah, but can root connect from the console?

All the best

From inside the server I can connect to the outside with ssh as root. Strangely enough from the outside it is impossible to enter that server with both ssh or telnet as root. It's like root has no permission to enter that particular server.

Everytime I try to connect the following error occures: Received signal 11. (no core). The authentication however does succeed.

Here's the output of using ssh -v:

warning: Development-time debugging not compiled in.
warning: To enable, configure with --enable-debug and recompile.
debug: Ssh2/ssh2.c:1848: User config file not found, using defaults. (Looked for '//.ssh2/ssh2_config')
debug: Connecting to server1, port 22... (SOCKS not used)
debug: client supports 3 auth methods: 'publickey,keyboard-interactive,password'
debug: Remote version: SSH-2.0-4.0.5.5 SSH Secure Shell
debug: Major: 4 Minor: 0 Revision: 5
debug: SshProtoTransport/trcommon.c:1464: lang s to c: `', lang c to s: `'
debug: SshProtoTransport/trcommon.c:1530: c_to_s: cipher aes128-cbc, mac hmac-sha1, compression none
debug: SshProtoTransport/trcommon.c:1533: s_to_c: cipher aes128-cbc, mac hmac-sha1, compression none
debug: Remote host key found from database.
debug: server offers auth methods 'publickey,password'.
debug: Ssh2AuthPubKeyClient/authc-pubkey.c:1733: Starting pubkey auth...
debug: SshUnixUserFiles/sshunixuserfiles.c:354: Using '//.ssh2/identification' as identity file.
debug: Constructing and sending signature in publickey authentication.
debug: Ssh2AuthPubKeyClient/authc-pubkey.c:725: reading private key //.ssh2/id_server1
debug: Ssh2AuthPubKeyClient/authc-pubkey.c:1822: Public key authentication was successful.
Authentication successful.
Received signal 11. (no core)
debug: Got session close with exit_status=255
Connection to server1 closed.

And yes it's fine if you export it to the AIX group.

Thanks!

Another fact I forgot to mention:
If I try "ssh server1" it fails.
If i try "ssh server1 ls", strangely enough it works...
So root can in fact connect to that server, but just can't logon to it.

Greetings.