Trying to chase down why my server locks up so much.

One ping program returned these lines from the HEADER during an outage.
I couldn't find where it's set in ubbthreads.php

Is this expiration date valid?
Set-Cookie: ubbt_hash=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT

--BIll B