It is a common issue with vBulletin. If you get 404 – page not found error in vBulletin, first try enabling RewriteBase within .htaccess file.
In order to do so please find the following line within your .htaccess
#RewriteBase /
and uncomment that line.
If you have installed vBulletin inside a sub folder such as forum you should use the following RewriteBase
RewriteBase /forum/
If
this does not resolve your problem please make sure your host supports
mod_rewrite and you are allowed to use .htaccess file on your hosting.
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