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Version
All versions
Explanation
Unable to connect to session.
Cause
The network is disconnected or the client has a problem.
Action
This error message is just a notification saying that the database server detected and tried to disconnect an abnormal connection. The client did not exist, so the session was closed.
The internal thread (CM detector) which checks abnormal connections is closing the connection. Thus, no action is required.
Reference
N/A