Try checking your TSO region size.  It could be a failure in obtaining the
comm buffers.
If it is a problem with authorization I would expect some RACF message that
gives
additional details about an authorization problem.

 errno 156 is EMVSINITIAL which is not listed in the TCP/IP manuals as a
possible
return code for a socket() call.

From a RACF perspective, you can make sure your RACF user has a UID
defined in an OMVS segment.  Use the RACF command LISTUSER to check
for a UID in the OMVS segment.  If not using RACF then check the
appropriate
area in your security package for the similar function.

David Bohm
ADSM server development
email - bohm AT us.ibm DOT com

>After starting the TSO Admin client and after entering the administrator's
>userid I get the following messages in the dsmerror.log:
>
>TcpOpen(): socket(): errno = 156
>TcpOpen: Error creating TCP/IP socket.
>sessOpen: Failure in communications open call. rc: -50
>ANS1017E Session rejected: TCP/IP connection failure
>ANS8023E Unable to establish session with server.
>
>When one of our Systems programmers tries it, it works perfectly.
>We both use the same options file and Rexx exec.
>The only thing we can think of is, that it is caused by a difference in
>authorizations.
>Can anyone help.
>
>Thanks,
>
>Luuk Kleibrink
>Storage Administrator, Delta Lloyd, The Netherlands