Need help with networking problem on unix Concurrent machine.

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1 total messages Started by Lisa Henry Thu, 13 Aug 1992 23:06

#18

Author: Lisa Henry
Date: Thu, 13 Aug 1992 23:06

56 lines
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I'm having trouble with a networking problem involving several
test stations running with a Concurrent computer (UNIX/6.1) 
(the man pages footer says AT&T SYSV.2 and 4.2BSD),
networked between two subnets (ethernet), with several X-terminals
connecting to them over the network.  

The problem is that periodically (on some nodes once to twice
a day) the ARPA network services on these nodes gets 'hung', for
lack of a better word.  These are the symptoms:

1.  I am not able to remote connect to a node that is 'hung' from
    one that is running okay by means of telnet, ftp, rsh, or
    rlogin.  

    With ftp and telnet, the initial connection is made:

    % telnet hung_node
      Trying...
      Connected to hung_node.
      Escape character is '^]'.

    but nothing happens after that.  Similarly with ftp:

    % ftp hung_node
      Connected to hung_node.

    and again no response after that.  

    Also, when the system is hung up, X-terminals are not
    able to download server code from it.  They are using
    tftp to transfer the server files.

2.  I *can* execute these utilities from the hung_node to other
    systems that are running okay.  Works just fine.

3.  The above symptoms led me to think that the netd process 
    was somehow locked up, so I tried to kill it.  It won't
    die.  No option to kill has worked so far. 

4.  The only solution so far has been to reboot the machine,
    which stops and restarts the netd process, and then 
    everything runs just fine.  

    The problem is that I can't just reboot the machine every
    time this happens.  There are users running from X-terminals
    and dumb-terminals all over, and I can't just keep 
    interrupting their work.  

So I need a less drastic solution than rebooting.  Anyone have
any ideas?  Any help would be appreciated.  
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~  Lisa Yvette Henry           * System Administrator 
~  root@hp750_s1.ds.boeing.com * Status:  Babe in the woods...
~  hank@bcstec.ca.boeing.com   * "Wow, look at all these toys!"

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