I work for this company and they put a block on certain groups of network users for internet access.

We only have limited access to a few sites...

Any idea how to avoid this?

A ping to a domain will result in an IP, but no respondse.

If you can use one of the authorised IP addresses to use as a proxy server (the same one they use), then you may be able to connect to the whole Internet. Hope this helps.

Cheers,
Infinite

PS. The dns servers are working for you, but the firewall/proxy server is denying you access to that IP/domain address.