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MS Proxy Server and IP Connectivity

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9 replies

by bseay 1 view

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I have an NT netowrk running MS Proxy Server. I am trying to use a vpn connection from the office to a remote client. From the Proxy, I can log in wothout a problem. from any PC, however, I can not connect. Additionally, I can not even ping across the Proxy to the Internet. I get name resolution, but destination host unreachable errors.

Any Ideas?

9 replies

by Former member

Does the proxy deny any ports? You should check these.

Pinging through a proxy-If you use NAT on the proxy, then you're doing a translated ping, and that may not work.

When you establish a VPN, your IP may have the incorrect scheme thanks to the proxy server...

by bseay

Nope, I opened them all. I am using NAT, but I don;t think that's the problem

by Member 33070795

First the easy part! The word according to MS is:
(http://support.microsoft.com/Support/proxy/faq/apps/102.asp)
Does PING work through the Proxy Server?

No, ping uses the ICMP protocol to communicate. Proxy only supports TCP and UDP packets. Ping will resolve the DNS name but go no further.

Next. PPTP uses Port 1723 ( I think) and you need to have that port open to the clients and of course the necessary permissions granted. The server can connect because it doesn't go through the Proxy.

You can configure the Proxy server so that it is bypassed for selected IP addresses or Domains if that is appropriate to your needs.

by bseay

I configured the client to bypass the proxy for the PPTP connection and it works.

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