Some people on the network can access a website, but others can't

Some people on our network can access our homepage, but others can't. I've checked routing, rights, our web filter and I cannot find anything that would cause this.
The people who host our website can't seem to find anything wrong on their end either.
Any ideas?
 
See if everyone is using the same anti virus.

I have had this problem once trying to reach the game runescape didn't work and after a day or two it started working.

If they are using a anti virus then the program might be blocking the site.
 
Guarded

Hello,
Thanks for your replys. These PCs are frozen with Centurion Guard, so they have no antivirus installed.
We are all using the same Windows firewall as well as the firewall that's in our router.
Thanks
 
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