Oracle Message ORA-06321 - IPA: Cannot reach the remote side

ERRORIPA: Cannot reach the remote side
CAUSEThere has been a timeout on an attempt to connect to a remote server the reason for which is most likely to be the remote SQL*Net IPA software is not running. An alternative reason could be that the remote initiator service name is incorrect.
ACTIONCheck and start the remote SQL*Net software. Check that it is started with the correct service names supplied.