I have a terrible problem that I have tried to solve since three days ago:
I browse my own web site and after a while I cannot access the web site. AT ALL!
I can only see a 501 error message:
"Method Not Implemented. GET to / not supported. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."
Once I get that error the site is totally and permanently inaccessible in that browser!! Reboot, browser restarts, clear cache, clear all history and cookies, etc., are not working.
I have reproduced it in 4 different computers. Three computers are in one city, the 4th is in another city. Two different ISP's also. One computer is Linux, the others are on Windows (XP and 2000). Browsers are FF 3 to FF3.5 and IE 8.
The error is ALMOST reproducible on demand (for me at least). It appears when I browse the forum under certain circumstances. I don't know which are these circumstances, but if I browse it long enough (10 sec to 5 minutes) it eventually appears. Just to make it clear, once the error appears (while browsing the forum) then the whole web site become inaccessible, not only the forum!
My host is not willing to help because they say they cannot reproduce the error. I sent screenoshots but they don't care.
Reseting browser's settings from the 'Tools->Clear private data' din't worked. However! When I have cleared the same settings (more exaclty) cookies from the special menu that appears when you right click website's icon, it worked. So it was something related to a cookie BUT it manifests in all browsers (FF, IE, Opera). So it cannot be a browser related problem.