The SAP system expects to use ports 3300 through 3399 for SAP gateways. If the Publisher channel of the SAP User driver connects as a JCo server and that server is configured to connect to a gateway on System 01, then SAP tries to connect to the driver on port 3301. If the System is 11, then port 3311 is expected.
The automatic configuration of these ports is prohibited in SUSE® Linux Enterprise Server, Windows* 2008 64-bit server, and Solaris 64-bit server. The ports must be manually configured in the following files:
Linux/UNIX: /etc/services
For example:
sapgw01 3301/tcp # SAP Gateway for IDM User Driver JCO
Windows: C:\WINDOWS\system32\drivers\etc\services file
For example:
sapgw01 3301/tcp