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Cannot access internet via vpn and squid proxy

This is a bit outside my area of expertise, any pointers welcome. The MD of a company I support has moved to Spain, but wants to access certain UK-only services. I have set up a Squid proxy server on a box running XP Pro. It has an ADSL connection via an ethernet router. If I set my browser on my (remote) pc to use this proxy, specifying an internal address (192.168.x.x) and port 3128, once I have established a vpn connection, it works just fine. When the MD brings his laptop to London and is connected via the main corporate network, he is also able to connect via the vpn to the proxy server and it works just fine. Using his ISP in Spain or Vodafone 3G access, however, nothing happens. I am assuming the ISP blocks the port. Is this likely to be the case and if so, how can I find a port that isn't blocked.

Many thanks for your help...Chris
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chrisp666
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chrisp666
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1 Solution
 
arnoldCommented:
If the person is able to establish a VPN connection, the functionality should be there if the browser if properly configured to use the proxy.

Not sure whether setting up a proxy for some one to bypass the locale restriction is a good practice.  
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chrisp666Author Commented:
Maybe not, but he's the MD! It works just fine with one ISP, so the fundamental set up is ok.
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arnoldCommented:
If the VPN cannot be established, this means that the ISP is blocking it.  If a VPN is established, that would mean that there might be IP overlap.  Check the local IPs versus the IP on the VPN LAN (include the netmask).
 
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chrisp666Author Commented:
Ah...a good point...I had not thought of that, thanks Arnold, I will have a look. The vpn does establish, by the way.
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chrisp666Author Commented:
Arnold, it wasn't that. Clearing 'use default gateway on remote network' solved the problem. Thanks anyway though.
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