Thread:Project:Support desk/Are there forbidden character sequences that can cause 404 errors?/reply

Thats one of the more weird issues I've ever heard of.

I think its just the phrase "drwxr" appearing in the output causing this. I think it might be your webserver, because http://pj.freefaculty.org/cgi-bin/mw/api.php?action=help&requestid=drwxr causes the issue, which doesn't really invoke much of mediawiki at all. You might want to try putting just a plain html document containing "drwxr" (and perhaps a plain php document outputting just that) to try and see if its a web server or php issue.