A 404 error is an HTTP status code that means that the page you were trying to reach on a website couldn't be found on their server.

Technically, an Error 404 is a client-side error, implying that the error is your mistake, either because you typed the URL in wrong or the page has been moved or removed from the website

www.islamonline.uhostfull.com redirect to 404 error..

it could be corrupted .htaccess file . check your htaccess file in your oxwall it should look like this.

Options +FollowSymLinks
RewriteEngine On

AddEncoding gzip .gz
AddEncoding gzip .gzip
<FilesMatch "\.(js.gz|js.gzip)$">
  ForceType text/javascript
</FilesMatch>
<FilesMatch "\.(css.gz|css.gzip)$">
  ForceType text/css
</FilesMatch>

RewriteCond %{REQUEST_URI} !^/index\.php
RewriteCond %{REQUEST_URI} !/ow_updates/index\.php
RewriteCond %{REQUEST_URI} !/ow_updates/
RewriteCond %{REQUEST_URI} !/ow_cron/run\.php
RewriteCond %{REQUEST_URI} !/e500\.php
RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.xml|\.feed|robots\.txt|\.raw|/[^.]*)$  [NC]
RewriteRule (.*) index.php

some urls not working properly
eg. http://islamonline.uhostfull.com/join

i don't know what to do help me please ....

thanks..