Problems with SSHD

[Jonathan horne]

On Sun, 11 Mar 2007 23:24:13 +0100
"Alexander Schlichting" <alex at cshw.net> wrote:

>  
> 
> Hi,
> 
>  
> 
> I am having a big problem with the OpenSSH Daemon on my server. Whenever I
> am connected to the server and the connection is idle for a few seconds it
> gets disconnected. It's almost impossible to work from remote on the server
> when the connection is always getting dropped. The server is running FreeBSD
> angmar.domain.com 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30
> UTC 2007     root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP  i386 and
> the SSHD installed by sysinstall OpenSSH_4.5p1 FreeBSD-20061110, OpenSSL
> 0.9.7e-p1 25 Oct 2004 . I tried a complete FreeBSD reinstall but it did not
> help, I tried various settings like KeepAlive TCPKeepAlive but they did not
> help either. I upgraded OpenSSL to 0.9.8e and I installed OpenSSH 4.6p1 but
> it did not solve the problem. When I run SSH with loglevel debug I see this
> in the auth.log when I am getting disconnected: Read error from remote host
> 192.168.2.100: Connection reset by peer . When I use strace to monitor the
> process I see this on disconnect
> 
>  
> 
> 643   wait4(-1, [WIFEXITED(s) && WEXITSTATUS(s) == 0], WNOHANG, NULL) = 4975
> 
> 643   wait4(-1, 0xbfbfdc9c, WNOHANG, NULL) = -1 ECHILD (No child processes)
> 
> 643   syscall_416(0x14, 0, 0xbfbfdc20)  = 0
> 
> 643   syscall_417(0xbfbfdcd0)           = -1 (errno 4)
> 
> 643   select(7, [3 4], NULL, NULL, NULL <unfinished ...>
> 
>  
> 
> I tried to find information's about syscall_417 but had no luck with that. I
> am stuck here and have no idea what to do. When I am connected to the server
> by FTP I don't get disconnected when the connection is idle ( no nohup or so
> being sent ) and when I connect by Telnet I also don't get disconnected when
> the connection is idle. I am not sure if I should add the dmesg output here
> for sys specs or not. I don't do it now but can give it if needed.
> 
>  
> 
> I installed Debian on another HDD of the server today and I am not having
> any problems there. No SSH disconnects all the time. Thanks for any help.
> 
>  
> 
> -Alex
> 

out of curiosity, what kind of nic is in the machine, and did you try swapping it with another?

cheers,
jonathan