VPN client problem when trying to initiate client connection from behind a firewall
I have set up a vpn server using W2003 RRAS.
I have set up a pptp client on my laptop and I can connect with this if I use a modem connection.
However if I am at a client's office I still need to connect to my network through their system. So if I plug my laptop into their ethernet network I can get a connection the internet but I cannot get to my network using the VPN. It seems that the request gets to my server but the response is lost. I would guess a firewall issue.
I need to have access to my network from anywhere inside or oustside any of my client's firewalls. I do not really want to have to ask them to configure their firewalls to allow responses from my server. Is there a way round this?
Is my understanding of the problem correct? Is it possible to use pptp in this scenario? If not, are any other VPN methods going to give me the functionality I require.
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