Proxy Authentication (407) when launching Microsoft Virtual Labs behind transparent proxy

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holLaunchPad Online
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The remote server returned an unexpected response: (407) Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  ).

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When I try to launch any Microsoft Virtual Lab I get the error above.

I've done some reading and believe this is a configuration error within the .Net application but is there anything I can do to workaround it from the client side? For example
http://stackoverflow.com/questions/10857684/407-proxy-authentication-required-the-isa-server-requires-authorization-to-f

Client
OS - Windows 7 SP1
Browser - IE9/Firefox 22

Proxy
Websense Appliance

Proxy Configuration
WCCPv2 transparently forwarding HTTP/HTTPS traffic to the Websense Appliance. No configuration required within IE or Firefox and it works for all other sites.
LVL 5
ReceptAsked:
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amatson78Sr. Security EngineerCommented:
I  would run a pcap and find the user agent to bypass it for proxy auth.
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ReceptAuthor Commented:
It's not pretty but I managed to workaround the application not handling proxy authentication by running the program Fiddler2 locally.

It creates a 'virtual proxy' which encapsulates the requests, with the correct authentication, and passes them onto the transparent Websense proxy.

I'd still love to know alternatives should anyone have any suggestions.
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