How come VPN Users are not able to connect to website in a DMZ?

Hi,

I have a internal network and a DMZ. In the DMZ there is a webserver.

Internal and HTTP clients can access the website in the DMZ, but when users access the network via VPN (cisco asa 5510) they are not able to access those websites hosted on the webserver.

I have no experience with this subject, so any help would be appreciated!

Any ideas?