Proxy Server Authentication

I am an ISA Novice. But this has been a very difficult trial for me. We do use a proxy server.

Part 1.

Some websites that are visited on my network my clients are greeted with an enter password box that states...

Please type your user name and password.
Connecting to proxy server <our server name>
realm: <our server name>

<user name>
<password>

A perfect example would be for like Yahoo's Launchcast music. This has hindered me I believe in syncronizing my SUS Server as well deploying a special credit card software for my accting dept. It is like my authentication scheme is off but I just don't know.

I have banged my head on this but like I said I am just a novice currently taking MCSE classes learning on the fly.


Part 2.

Below is an Auth error from the accting software

18:07:19 Initialize - HTTPSCnx : URLPort = 443
18:07:19 Initialize - HTTPSCnx : UseWinInet = False
18:07:19 Initialize - HTTPSCnx : Exit
18:07:19 tmrPost_Timer - frmHTTPS(1) : Enter
18:07:19 StartConnectTimer - frmHTTPS(1) : Interval: 60
18:07:19 HTTPS_Error - frmHTTPS(1) : HTTPS
18:07:19 StopConnectTimer - frmHTTPS(1)
18:07:19 mfrm_Error - HTTPSCnx : Enter
18:07:19 mfrm_Error - HTTPSCnx : ErrorCode = 118
18:07:19 mfrm_Error - HTTPSCnx : Description = HTTP/1.1 407 Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied.  )