Chris - I would prefer to see an Activity Log message which matched the
client time message.  If both ends see the session drop, neither did it,
and neither gets a good indication why, then it would have to be due to
something in between: network gear, or TCP/IP protocol stack in the OS.
One thing to check is that your client TCPWindowsize is not at odds with
that in your OS.
You might also do 'ping -s -vR <ServerHostname>' in Solaris, or use
traceroute, to look for any network participant which is new or unexpected
in the transmission path which may be contributing to this.
Talk to your network people and see if anything changed a couple of weeks
ago - or if anyone else is experiencing the same thing.
Also check out ANR0480W causes in ADSM QuickFacts.
I would also look further in the Activity Log for contextual clues, as
well as in the Solaris /var/log/messages log.
Don't overlook the trivial: verify that the failing session is trying to
connect to the same system that you are with your 'dsmc i' (including
using the same type of network addressing and port number): it's all too
easy for an unobvious environment variable or configuration file to be
in play.

   Richard Sims

On Fri, 3 Dec 2004, Chris Hund wrote:

> Greetings admin brothers and sisters,
>
> I've had an issue with one of my clients for a couple of weeks that I'm 
> unable to correct.
>This is a Solaris client, version 5.2.2.  The server is AIX, version 5.1.6.
>The client schedule starts with no problems, and sometimes a little bit
> of data is sent to tape, but invariably communication with the server
>gets hosed and I start seeing the following messages in the client's error log:
>
> *****
> 12/03/04   12:33:22 ANS1005E TCP/IP read error on socket = 5, errno = 131, 
> reason : 'Connection reset by peer'.
> 12/03/04   12:33:22 ANS1809W Session is lost; initializing session reopen 
> procedure.
> 12/03/04   12:33:38 ANS1810E TSM session has been reestablished.
> *****
>
> Here's what I'll see in the server activity log:
>
> *****
> 12/03/04 14:22:36     ANR0480W Session 1073 for node PRDWEB2 (SUN SOLARIS)
>      terminated - connection with client severed.
> *****
>
> Oddly enough, I can run the backup from the command doing a "dsmc i" and it 
> completes
...
>
> The problem started for no particular reason a couple of weeks ago.
...