Date: Sun, 11 Mar 2007 17:52:25 +0100 From: "Alexander Schlichting" <alex@cshw.net> To: <questions@FreeBSD.org> Subject: OpenSSH Problem with disconnects Message-ID: <035c01c763fd$b7341cf0$259c56d0$@net>
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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@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
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