Description

Whenever Users tries to Login via Studio or Transaction User gets the Error "Connection to Message Server Failed Service ? Unknown"

Applies to

10X; 11X

Solution

This error occurs when entry of the sap system message port is not present in the services file.

Location of services file: %windir%\system32\drivers\etc

Add the following entry at the end of services file.

sapms[SID]         36[system number]/tcp          # comment

Note : this entry in the services file should be followed by {return} key.

Example:
W47 connects to sap using message server logon with system number 03

sapmsW47         3603/tcp          # SAP System Message Port for W47

How to determine the system number?

Logon to SAP server and run t-code smms. It will show the message server port.