DGOK3640 The server task is not valid; a logoff has been performed.

Explanation

The client received a return code 8 with reason code X'64' from the data collector task. The data collector returns this error if the user's started task is in an invalid and unrecoverable state. The most common reason is that the data collector ran out of memory. The client cannot recover from this situation because all subsequent requests against the server lead to the same error.

Logging off and on usually frees some resources and allows the user to continue for a while. However, over time, the error recurs.