users authentication fail

[joe12321]

hello, i have install the isa 2004 and have some problems in user authentication. Here is the setup:

i have set up a back end ISA 2004 server which redirect the traffic upstream to front end ISA server. In the back end ISA i have joined the domain and created a access rule to allow specific domain users and localhost (ISA server itself) user to access the internet (http). Then when i use the internal machine(proxy pointing to ISA in IE setting) to access the internet, it returns error if i log on as domain user, it said
"HTTP 407 Proxy Authentication required - The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied. (12209)"
....but when i use localhost (ISA) to access internet, it works. I could nslookup the domain controller in the ISA server. Is there any idea of this problem?

Sorry for my poor English, thanks

Jo

 

[dyngo]

which is the first DNS for the isa?
is it an internal DNS with all the SRV records to find the DCs?
If the first DNS is contacted is the only one checked

also check the system rules about DNS and DCs
Allow DNS from ISA Server to selected servers
Allow access to directory services for authentication purposes

and then check the proxy authentication configuration
Configuration>Networks> properties of the Internal network>Web Proxy tab>Authentication button normaly the integrated authentication is used, here you can also define the default domain for authentification