I am having a problem with Apache version 2.053 running with PHP 4.3.10. This install of Apache is running on an XP professional installation service pack 2. The problem is that anywhere from 1 day to 6 days, (which I don't think the number of day matters) Apache will begin to refuse port 80 requsts and will not allow my users access to the server. I have been running this web server for a number of years now, but recently migrated to a new machine and new OS install and upgraded apache and the rest of my server softwares when I made the change, (I know, alot of variable all at once), but everything else seems to be ok, except for this problem. I looked at my log files after every occurence, and it seems that there are indications of search engine spiders (non malicious), and either spider hits to my webmail page, or a user on my webmail page around the same time. My webmail installation runs on IIS on the same machine, and apache proxies the mail.site.com request to IIS when the user calls it up.
Does anyone have any ideas?