Release : 13.5
Component : OPS/MVS
It is possible that a RESTART(MSF) solves this problem. However, a restart of the entire OPS subsystem may be required.
"In the event that MSF is unable to close its VTAM ACB, the restart will not be successful, and you may need to restart the entire product. The MSF system definitions will not be preserved after an MSF restart. You will need to redefine the MSF sessions by using the MSFRESTARTREXX parameter to call an OPS/REXX program that you have written to set up your MSF environment after the MSF has been restarted."