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Full Discussion: General Unix Error Logging?
Top Forums UNIX for Dummies Questions & Answers General Unix Error Logging? Post 302350201 by Dave Stockdale on Thursday 3rd of September 2009 04:57:21 AM
Old 09-03-2009
General Unix Error Logging?

Yesterday evening my server appeared to fall over. I couldn't copy (scp) files to it, and I couldn't SSH to it either. Every time I tried, it just gave me this message:

Read from remote host <IP ADDRESS>: Connection reset by peer
Connection to <IP ADDRESS> closed.


I got in this morning, and unfortunately it hadn't fixed itself. I went down to the server room to try and use the console down there, but that wasn't responding, so I rebooted it.

This fixed the problem, and everything came back up, but I would like to know what happened to it. I've had a look in /var/log/secure and it isn't massively helpful - it shows the last activity before falling over as being on 30th August (which is correct) and then nothing until 9:10 this morning:

Sep 3 09:10:24 www sshd[2849]: Server listening on :: port 22.
Sep 3 09:10:24 www sshd[2849]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.


Which I guess is when I booted it. It hasn't recorded any failed attempts to connect to it.

Are there any logs that might show me what happened in between this period so that I can figure out what went wrong? I was thinking maybe some process logs or something?

Sorry for the lengthy post, wanted to give as much detail as possible. Thanks guys!
 

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libssh2_channel_forward_listen_ex(3)				  libssh2 manual			      libssh2_channel_forward_listen_ex(3)

NAME
libssh2_channel_forward_listen_ex - listen to inbound connections SYNOPSIS
#include <libssh2.h> LIBSSH2_LISTENER * libssh2_channel_forward_listen_ex(LIBSSH2_SESSION *session, char *host, int port, int *bound_port, int queue_maxsize); LIBSSH2_LISTENER * libssh2_channel_forward_listen(LIBSSH2_SESSION *session, int port); DESCRIPTION
Instruct the remote SSH server to begin listening for inbound TCP/IP connections. New connections will be queued by the library until accepted by libssh2_channel_forward_accept(3). session - instance as returned by libssh2_session_init(). host - specific address to bind to on the remote host. Binding to 0.0.0.0 (default when NULL is passed) will bind to all available addresses. port - port to bind to on the remote host. When 0 is passed, the remote host will select the first available dynamic port. bound_port - Populated with the actual port bound on the remote host. Useful when requesting dynamic port numbers. queue_maxsize - Maximum number of pending connections to queue before rejecting further attempts. libssh2_channel_forward_listen(3) is a macro. RETURN VALUE
A newly allocated LIBSSH2_LISTENER instance or NULL on failure. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket. LIBSSH2_ERROR_PROTO - An invalid SSH protocol response was received on the socket. LIBSSH2_ERROR_REQUEST_DENIED - The remote server refused the request. LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block. SEE ALSO
libssh2_channel_forward_accept(3) libssh2 0.15 1 Jun 2007 libssh2_channel_forward_listen_ex(3)
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