Re: Proxy & VPN

From: Leythos (void_at_nowhere.lan)
Date: 08/09/05 

Date: Tue, 09 Aug 2005 14:30:03 GMT

In article <E0E82D3F-702C-4818-8D85-4C9B1BF920F0@microsoft.com>,
MichaelMetzger@discussions.microsoft.com says...
> Hello everybody!
>
> OS = XP SP2
>
> By GPO th IE ist told to use a proxyserver (ISA2004).
>
> Users are not allowed to leave the corporate network for internet traffic
> without using the proxy, spezified on the firewall.
>
> Administrative Computers are allowed, for testing reasons, but normally
> still use the proxy. Administrative Computers are also allowd to establish
> VPN connections outside. (Simple PPTP MS VPN)
>
> Leaving the corportate network for Internettraffic over the proxy server
> makes the outside world see a different IP than leaving it just over the
> firewall, thats the reason why I found out th efollwing issue:
>
> What happened is, I established a VPN connection outside and was using IE at
> the same time. Although the IE was correctly configured to use the proxy
> server, it didnĀ=3Ft, but went straight throught the firewall. As soon as i
> disconnected the VPN connection, everything was fine again. This issue did
> not happen when trying the same thing with firefox.
>
> Does anybody know reasons for that?

When you VPN outbound you abandon your internal network and use the VPN
tunnel - simplistic way to look at it. You can't use your internal
resources.

When you use FF, it doesn't know about the proxy and will work just
fine.

IE can't reach the Proxy while your VPN is active. 

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