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We could use some more information such as do you own your own server or are you using a colocation site?
Version of XOOPS?
Do you have any security files installed such as
.htaccess
index.html
Have you changed anything on the site or the server configuration?
Is there any information in the web server error logs?
On Linux/Unix using apache this is usually in:
/var/log/apache/error_log
but varies with your operating system. Windows would have this in the system event log.
Sam Bowen