Please paste the entries prior to (say 10-20 lines) these that indicate what triggered 503 error and what was going on that time, etc.
Also check stderr.log.
Advanced Search (/search.php) is OK. But What's New (/search.php?do=getdaily&contenttype=vBForum_Post) isn't.
Last edited by webizen; 09-23-2011 at 08:49 PM..