Cannot Ping DNS server

[GaryGilgan]

Hi, I have recently got our Cisco engineer to create a VPN connection to our network through a ASA5510.

I am able to ping all devices on the network bar two servers (2xW2K3, one configured with AD/DNS and the other is a AD/file server) using IP addresses

However, I cannot ping any devices using host names. The engineer has entered in the correct IP address of our DNS server, but still we have this issue. As the VPN client cannot ping the DNS server, it is unable to resolve the host names, but I cannot seem to work out why we cannot ping the DNS server, so any suggestions?          

[malshbou]

do you use tunnel-all or split-tunnel ?

if split-tunnel, is the IP of the VPN DNS server included in the split-tunnel acl?

if included, is it configured under the group-policy that is assigned to the clients ?

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Mashal