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Conference lassie::ucx

Title:DEC TCP/IP Services for OpenVMS
Notice:Note 2-SSB Kits, 3-FT Kits, 4-Patch Info, 7-QAR System
Moderator:ucxaxp.ucx.lkg.dec.com::TIBBERT
Created:Thu Nov 17 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:5568
Total number of notes:21492

5237.0. "A TCP/IP or router question on lost packets and a winsock hang on read" by MANANA::FLANAGAN () Tue Feb 18 1997 13:37

    Hi,
    
    This may really be a TCP/IP or router question...
    
    Several users experience an occassional hang on their PC's which requires them to
    reboot their machines..  Other users on a different network segment but accessing
    the same server (they say) do not have the problem.
    
    The application, TeamLinks V2.5, is doing a Winsock read using the Microsoft
    Winsock.dll on Windows 3.x, against a TCP/IP connection to a server running 
    UCX 2.5-3.
    
    The application is not really hung, it is doing a blocking read, waiting for 
    a response from the server.  Is it possible that an outgoing packet from the
    server was lost but the connection remains up?
    
    Is there some part of the underlying TCP/IP protocol which
    would tell the TCP/IP stack on the server or client side that a packet
    never got through?
    
    Any suggestions on how to diagnose, more easily reproduce (or fix) this?
    
    / Peter
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