This preserves the count of Mode Configuration settings this device dispatched and had rejected by the peer (client) over a now-expired tunnel's full lifetime, per its description. It's the historical audit trail for whether a specific closed remote-access session's client kept refusing an attribute the head-end tried to push, such as a split-DNS or routing setting. A nonzero value here paired with a short tunnel lifetime suggests the attribute mismatch may have contributed to that session ending early.