Connections Hang

From: Tanya Seno (data_at_csun.edu)
Date: 06/23/05

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    Date: Wed, 22 Jun 2005 16:55:37 -0700
    
    

    Hi

            I am having a really random problem. I have a dual opteron proliant
    dl145 system running Redhat ESv3. The problem is that for the last three
    weeks I would have to reboot it about every 5 days because no new
    network connections could be established to the machine. I will try to
    ssh and I get a prompted for my password but after that it just hangs.
    The same is true of telnet and ftp. Other things hangs like changing a
    user password. Could I be running out of file descriptors or inodes?

    When I do a strace on a hang process I get this ...
    [root@scali rc2.d]# strace -p 19459
    Process 19459 attached - interrupt to quit
    select(4, [3], NULL, NULL, {6, 310000}) = 0 (Timeout)
    select(4, [3], NULL, NULL, {10, 0}) = 0 (Timeout)
    select(4, [3], NULL, NULL, {10, 0}) = 0 (Timeout)
    select(4, [3], NULL, NULL, {10, 0}) = 0 (Timeout)
    select(4, [3], NULL, NULL, {10, 0}) = 0 (Timeout)
    select(4, [3], NULL, NULL, {10, 0}

    [root@scali rc2.d]# netstat -ap | grep -i CONNECTED | wc -l
         142

    unix 2 [ ] STREAM CONNECTED 2347840 19561/sshd:
    root [p
    unix 3 [ ] STREAM CONNECTED 2329799
    19459/scaproxyd
    unix 3 [ ] STREAM CONNECTED 2329798
    19459/scaproxyd
    unix 3 [ ] STREAM CONNECTED 2329797
    19459/scaproxyd
    .... about 81 entries of this which I can't kill.

            Any tips would be greatly appreciated.

    Thanks,
    Tanya


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