Prem,
It would be helpful to have more information like the platform and TSM verison of the client and Spectrum Protect (TSM) Server. But from reviewing the log you provided it appears to be a connectivity issue. There are numerous messages that indicate a problemm for instance:
ANS1815E Either the window has elapsed or the schedule has been deleted
Check the details of your schedule, you may need to increase the duration and/or duration units.
ANS1351E Session rejected: All server sessions are currently in use
Check you maximun sessions and maximum scheduled sessions parameter on the backup server by issueing the "q stat" command and increasing them as needed. This message is saying when the client is trying to perform the backup all available sessions are being used, you will need to increase the number of allowed scheduled sessions, or re-schedule the backup at a time when the backup server is not so busy.
The error I see most is obviously:
ANS5216E Could not establish a TCP/IP connection with address '10.50.59.73:1500'. The TCP/IP error is 'Unknown error' (errno = 10061).
This is saying for whatever reason the machine cannot access the IP address and/or port specified. To troubleshoot this issue refer to the following link:
http://www-01.ibm.com/support/docview.wss?uid=swg21623552
-Rick Adamson
edited: corrected response by changing period and period units to duration and duration units.