Wow. first time I see this.
Did you install SAP Gui on your PC?
If yes you should have this file. There is a list of message servers for 3 digit SAP System ID (SID)
e.g. AX8 is myserver.mycompany.com.
under c:/Windows/system32/drivers/etc/services is also list with ports for message server
So you best is you define your system in EP not via SID but via message server directly. Its safer.
Use help.sap.com and try a little. Its not so easy to understand all parameters directly.
BR,
Oliver
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