I am running TSM v3.7 on an NT 4.0 Cluster. I am performing some tests to 
ensure reliability of the arrange. One of these tests consists in launching a 
large backup from a client outside the cluster through the public network and 
force the failure of one of the machines on the cluster. It is supposed that 
the restart must be transparent for the client, and once the other machine on 
the cluster takes control of the resources the TSM should reopen the session 
and the backup should continue to complete. But once the TSM restarts the 
session to complete the back up, the following message appears on the client:
                          ! TCP/IP communication error
and the 'q ses' command on the server displays the following:
                         Session status      IDLEW          instead of          
RUN

I don't know what could be causing this.

Thanks in advance.
Regards.

Gerardo Zapata
Tivoli Prfessional Services/ADSM
IBM de Mexico
(5) 270 5740