VPN and unwanted HTTP proxy

I have a VPN tunnel working to my customer's site. However, it forces an HTTP proxy setting which routes all my http traffic through their proxy server. A side effect of this is that I can't access internal machines because the proxy server is only set up to access machines outside their network. This kind of defeats the point of the VPN.
So, my goal is no http or https proxy. DNS should resolve based on search domains. This all works for non http/https requests. My mac can resolve all the domain names properly and can send traffic to the machines just fine. Ssh, vnc and other non-web access works great, both hosts over the VPN tunnel or just out my WAN interface.
It's just the web proxy that is causing grief.
Thanks for any help.

Another piece of information. I screwed up and had a bogus entry in the /etc/hosts file for the machine I was testing web access to. Now I can access internal machines at my customer's site. However it looks like the web proxy is still in effect. If I set the Bypass proxy settings for these Hosts & Domains to * I see the change take effect with the scutil --proxy command. However my traffic still goes through their proxy server.

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