Net-Library routine net_listen() failed in srv__start_net. Network error: status = 12 - Net-lib protocol driver call to register a listener failed
This is the Open Server equivalent of “Network port already in use.”
If your system is Digital OpenVMS using DECnet:
The SYSNAM privilege is required to start a DECnet listener, just as with Adaptive Server. Check to be sure this privilege is set appropriately.
If this fails to help, try using DECnet object names instead of object numbers. If this works, then report to Sybase Technical Support that you have encountered bug 51237.