Resolving a service 'sapxxnn' unknown error

While deploying an inbound module to test environment, if you get an error message stating that the "service 'sapxxnn' unknown" (where xx is two letters, and nn is two numbers), you can resolve this by adding a missing entry into the services file.

This error is caused when the SAP gateway protocol 'sapxxnn' is not existing in the services file. In UNIX, it is located in etc/services and in Windows, it is located in \WINDOWS\system32\drivers\etc\services. To verify and resolve this error: