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SQL-02128:

Sessions still exist, not logged off
Cause: A host was not removed ("logged off") from SQLLIB because XA still has sessions associated with that host.
Action: Before calling SQLXDH to drop a host, XA must either drop all sessions for that host or set the "doit_anyway" flag. *Note: This error *msg* is never actually used. The error *number* is used, given as a possible return value to the sqllib xa function sqlxdh.