The connection between Client and Server process was broken.
1. Restart Post.
sp_ctrl> start post
2. If Post stops again with the same error then there was a communication error that requires further investigation.
First, check for network problems and review the SQL*Net setup.
Secondly, ensure the Target database is up and running. Also look in the alert.log file for any errors.
Finally, test to see whether the server process is dead and whether a trace file was generated at failure time.