This error is generated whenever the driver cannot access the target PeopleSoft Application Server. Typical reasons for the error are:
The Application Server address and port number are incorrect or incorrectly specified (the format must be: //address:port number).
The Application Server is down.
If this error occurs on the Publisher channel, the driver retries transaction processing in 60 seconds or the configured poll interval, whichever is greater. If the error occurs on the Subscriber channel, the Identity Manager engine schedules event retries.