Counts how many TCP connections belonging to this row's named TCP server (in the NSXS Execution Server process's TCP framework) have been closed, whether the server itself or a remote host ended the connection. It sits alongside the accepted/refused/initiated connection counters for the same server name, so an admin can compare it to bwNSXSTcpServersNbConnectionsAccepted to see whether connections are being torn down at a normal rate. It is writable, so it can be reset by management tools along with the rest of the row's counters.