I am working on a server with Debian 5.2.2. Barely having any administrative knowledge with Linux, I think I screwed something up. I used apt-get update and apt-get upgrade to get everything up to date and then I downloaded and installed Apache, PHP, and MySQL. Those tools seem to work fine, but now I can't even login to the server EXCEPT via local console. If I try to login via the GUI or if I try to login remotely via ssh, scp, or anything else, I get disconnected IMMEDIATELY upon successful login. In other words, it has no problem with the initial connection, but when I put in the correct username and password (for root or any user), I get disconnected. With the GUI, the screen goes black for a second and then puts me right back to the login prompt. With ssh, I get "connection to [server] closed." I tried WinSCP and I get "Connection has been unexpectedly closed. Server sent command exit status 254."
Any help is appreciated, and if there is any way I could give more information, please let me know. Thank you for your time.
Edits:
-- Any user can login on the local console
-- At the moment I don't have local access to the machine, so all I can do right now is ssh. Here is the output of ssh -vvv [server] after I enter my password:
Linux xxxxxxx.com 2.6.26.8+20091222+1056-debhawk-5.2.2-custom #1 SMP PREEMPT Tue Dec 22 10:58:57 EST 2009 i686
Last login: Mon Apr 30 14:48:07 2012 from xxxxxxx.com
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug2: channel 0: rcvd close
debug2: channel 0: close_read
debug2: channel 0: input open -> closed
debug3: channel 0: will not send data after close
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i3/0 o3/0 fd -1/-1)
debug3: channel 0: close_fds r -1 w -1 e 6
Connection to xxx.x.xx.xx closed.
debug1: Transferred: stdin 0, stdout 0, stderr 35 bytes in 0.0 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 3845.3
debug1: Exit status 254
/var/log/messages
and/car/log/secure
logs when you try to log on remotely. Try logging on withssh -vvv <servername>
so you can see what is going wrong.dmesg
output might be useful as well but you'll need to trim and post only relevant parts. Can you log on with any user account on the local console or only root? Is the SSH daemon running (ps auxwww|grep ssh
)?