I've been having this problem for the past week: everyday in the afternoon my dedicated server goes unresponsive for about an hour or so--you can FTP into it (upload and download work fine) and access the control panel, but it refuses to serve up any webpages / files through the browser (no one can access my site). Meanwhile the CPU / RAM seems to be just sitting there being completely unused. This problem just starts by itself and then goes away by itself somewhat regularly. Restarting the server has no effect on this.
I'm puzzled as to what the problem could possibly be or how I can fix it--any ideas? My server's running Fedora 6 / GoDaddy control panel if it helps.
The part at the top probably would have been more helpful. Try netstat -tupan. However, it seems likely that just looking at your web server's logs or doing an strace on the web server daemon would help you find out what was going on.
-Mark Adams www.bitserve.com - Secure Michigan web hosting for your business.
Only host still offering a full money back uptime guarantee and prorated refunds.
Offering advanced server management and security incident response!
During the problem, use tcpdump to check if your server actually receives any web traffic and try to surf the site to check if your IP will appear on the list:
tcpdump -ni <interface> 'host <yourip> and port 80' (without <>)
- If it does but it doesn't respond back, then you may have to check server-related issues (firewall, daemon or even an incoming attack)
- If it doesn't, then your provider may be blocking the IP/port for some reason (i.e incoming attack or different issue)