Forum URGENT.... Users cannot connect to my site.
 

I have a problem and hopefully you maybe able to help.

I have a few users that simply cannot connect to my site, thay had been logged on earlier in the day, but now just get a blank screen when trying to connect.

They both can ping the sites URL, flushed their DNS and tried with http://www. and just http://

I have gone through my settings and cannot see anything out of order.

Any help would be most appreciated as both these users are my main moderators.

Thanks.