SAP Message RSM205 - No connection to system & possible: &

Diagnosis
Connection to system &V1& could not be created. Possible causes:
Source system &V1& is not available.
The application server is not available.
The communication parameters of source system &V1& are incorrect.

System Response
V2

Procedure
Check the possible causes and remove the problem. You can use thetechnical description of the source system for analyzing problems.