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[b]socket[/b] restarting every 5 minutes - same bug as [b]APAR IY89429 - 5300-05-03 ?[/b]

  • 1.  [b]socket[/b] restarting every 5 minutes - same bug as [b]APAR IY89429 - 5300-05-03 ?[/b]

    Posted Thu November 16, 2006 03:23 PM

    Originally posted by: Robert_Willcox


    We have a client that is getting sockets disconnected every 5 minutes. Weve noticed an APAR that indicates a bug in AIX 5.3 TL 4. The client is not willing to take their system down unless they know applying Service Pack 3 (w/ this fix) will correct the problem. The symptoms we see are that we have a TCP/IP socket connection, our host transmits a packet with the ACK sequence number set to X, our host then gets back a sequence number that is (X 1), this repeats every 30 seconds or so, for 4 minutes or so, until the host receives a RST and the socket connection is restarted for a while. This goes on and on. Our network engineers say that sequence numbers should never go/come in decreasing order and usually this symptom points to hardware failure. However the problem started when the client upgraded to AIX 5.3 TL 4.

    There is a new APAR for 5.3 Service Pack (SP) 3, released last month that could be the problem here. We haven't installed it at our clients yet. But am bringing it up to converse w/ the experts. The APAR:
    IY89429: AIX STOPS RESPONDING TO KEEPALIVES 06/11/01 PTF PECHANGE

    A fix is available

    Obtain fix for this APAR
    APAR status
    Closed as program error.

    Error description

    When a TCP connection goes idle, and remote end (need not
    be AIX) sends TCP keepalives, AIX will respond to 5
    keepalives and stop responding after that. However, it
    will respond to FIN when closing the connection.

    Local fix

    Problem summary

    ***************************************************************
    *USERS AFFECTED: *
    • All users with the following filesets at these levels *
    • bos.net.tcp.client 5.3.0.30
    • bos.net.tcp.client 5.3.0.31
    • bos.net.tcp.client 5.3.0.32
    • bos.net.tcp.client 5.3.0.40
    • bos.net.tcp.client 5.3.0.41
    • bos.net.tcp.client 5.3.0.42
    • bos.net.tcp.client 5.3.0.43
    • bos.net.tcp.client 5.3.0.44
    • bos.net.tcp.client 5.3.0.50
    • bos.net.tcp.client 5.3.0.51
    • bos.net.tcp.client 5.3.0.52
    *************************************
    #AIX-Forum


  • 2.  Re: restarting every 5 minutes - same bug as

    Posted Thu November 16, 2006 03:26 PM

    Originally posted by: Robert_Willcox


    that was supposed to be host receives a packet back with sequene number X minus 1.
    #AIX-Forum


  • 3.  Re: restarting every 5 minutes - same bug as

    Posted Fri November 17, 2006 10:16 AM

    Originally posted by: cd3lgado


    Hi

    I had the same problem with a lpar running a very sensible service for a customer. Every night in the past weekend several disconnections led the system to stop service. We are working with the networking team in order to improve the arquitecture but i think this AIX patch issue might be the problem.

    Thanks.
    #AIX-Forum


  • 4.  Re: restarting every 5 minutes - same bug as

    Posted Wed November 29, 2006 08:31 PM

    Originally posted by: Robert_Willcox


    The APAR I mentioned solved the problem!
    #AIX-Forum


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