DNS Problem - External Name Resolution

[ptbarnum]

I have an ISA server that is simply a member server. A domain controller that is also a DNS server. ISA a is conencted through a DSL connection with a dynamic IP. I have set up DNS with a forwarder to my ISP's DNS server. I also have that dns sever as a secondary DNS server in the IP properties of my DNS server. I currently have opened up all IP traffic in both packet filters and protocol rules. My DNS server has the ISA server's internal IP address as it's default gateway.

I am able to ping external IP addresses but am not able to ping external names. Ping of

http://www.verizon.net

returns

http://www.verizon.net

not found. The ISA FW-- log shows an entry and the IP log shows it going out as well. When I use a freeware proxy server in place of ISA server all works fine.

Any idea what I am doing wrong?

 

[znetbiz]

When you try to ping are you on the ISA box, or an internal box? Whne you do a NSLOOKUP on the internal, whatr server is it using? DNS utilizes a UDO port (17 and 53 I think). Are these open?

 

[ptbarnum]

I am on an internal machine. Pinging

http://www.xxx.com

from ISA server returns an IP address. NSLOOKUP from internal machine lists my DNS server as it's name server. My DNS server has the ISP DNS server listed as a Forwarder.

For testing purposes all ports and protocols are open.