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isa server 2004 problems resolving dns names

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Last Modified: 2012-08-27
Im using a isa server 2006 running on w2k3 .
The company has purchased a new server, and I have to reinstall the operating system but with ISA 2004.
 Install and configure the ISA 2004 and I started to try from a client.
 http proxy works ok, but i cant use telnet
 Detected that this is because it is not resolving the name.
 If I write telnet "ip" 80 works perfect.
 From the workstation I can connect fine with telnet ip,
Dns servers are not resolving external dns names .
Is not a dns problem because if i change the isa , the resolution works fine again
isa 2006 is disconected .
Two servers has the same ip
if i disconnet isa2k4 and connect isa2k6 everithing works ok
From the isa server 2004 (localhost) everything works ok . I can resolve internet adresses
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