DNS Forwarding Not Work

I have simpe network like follow,
DSL Modem------> ISA Server ----> Switch--->PDC, BDC, Exchange,.....

All Servers Windows 2003 SP2,

In Our DNS Server (PDC) I have put Our ISP DNS Addresses as
Forwarders. But it is Not working. I mean i can not Browse internet
even i can not ping, nslookup any Internet site or IP.
I thought it was becaouse of ISA Firewall. then now i have Unstall the
ISA Server Services for time being to test the Forwarding. even not
working.

ISA Serve MAchine IP address

External Interafce : IP : Static, Default Gateway: DSL Modem IP, DNS :
Empty
Internal Interface: IP: Local Static IP : Default Gateway: Empty, DNS:
Local DNS Servers.

At the same time PDC's interface: IP: Static : Default Gateway: ISA
Server IP, DNS: Local DNS


When i try NSLookup from PDC to ISP DNS Server :

++++++++++++++++++++++++++++++++
C:\>nslookup ISP DNS Server or IP
Server: PDCname.Doamin.com
Address: 192.168.*.*

DNS request timed out.
timeout was 2 seconds.
*** Request to PDCname.Doamin.com timed-out
+++++++++++++++++++++++++++++++++++

Please be noted now there is no Firwall Server (ISA) not installed.

But Local NSLOOKUP is working fine.

Please Any one Help Me.


.

Relevant Pages

  • RE: ISA Errors
    ... DNS Service as the DNS Server. ... On the DNS Server, create the DNS Forwarder to forward the external DNS ... Make sure the latest version of ISABPA is installed on the ISA box. ... Microsoft Online Newsgroup Support ...
    (microsoft.public.windows.server.sbs)
  • Re: Binding A Server To A Specific IP Address
    ... ISA will use the first IP bound to the external NIC and I don't know a way ... For DNS requests from the Internet to my DNS Server: ...
    (microsoft.public.isaserver)
  • Re: Binding A Server To A Specific IP Address
    ... I have multiple IPs on the external ISA NIC. ... For DNS requests from the Internet to my DNS Server: ...
    (microsoft.public.isaserver)
  • Re: Cannot get access to router on SBS server
    ... point the DNS server setting to the IP of the SBS ... calling CNetCommit::ValidateFulltimeConnectionProperties. ... Call to Reading web publishing selection returned ok. ...
    (microsoft.public.windows.server.sbs)
  • Re: Herb Martin...Global Catalog SRV record missing!
    ... Error: Root hints list has invalid root hint server: ... DNS server: 128.63.2.53 ... PTR record query for the ...
    (microsoft.public.windows.server.dns)
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