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VPN Disabled after Comcast Upgrade

We just upgraded our Comcast service and our VPN now only allows one person to connect at a time. Comcast denies responsibility.

We have a static IP address. The new modem is a Netgear CG3000DCR. I've setup port forwarding for a PPTP connection. Our old modem was a SMC Networks SMC8014. The setup for port forwarding on that was similar, except you had to specify the GRE protocol. On the CG3000DCR there isn't a place to do this.

We're relying on the modem as the DHCP. Our server runs Windows 2003 Small Business Server. It's setup to support 10 PPTP connections.  Our clients are mainly Windows 7 and Windows 8.  

Can anyone help? Comcast says they offer no technical support for VPN. They offer no documentation for this modem. Thanks to anyone who can provide expert help!
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Ron Indy
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Ron Indy
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masnrockCommented:
Comcast would give a response like that. Their attitude is that as long as you get a connection, everything is fine, even if their equipment causes your network not to work quite right. As much as I hate to suggest this, turn off the firewall entirely and see if that helps. I doubt that this will. Under the assumption that your modem came from Comcast, see if you can get them to either send you an SMC modem or provide you with a standalone modem instead. (The standalone modem would over course require you to get a router/firewall of some sort) A number of people fixed their issue that way.
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Ron IndyAuthor Commented:
Thanks for the suggestions. I've already requested an SMC modem. The tech said sometimes they have one. It wouldn't be the model we had before. The tech said Comcast would not allow us to buy our own modem if we have a static IP.

What is a "standalone modem"? Do you mean a modem that is in bridge mode?

Using Windows 2003 SMS, we could of course setup the server as the DHCP, rather than the modem. The problem with that is whenever the server needs to go down (or if we had a problem with the server), we would lose internet connection for all computers in the office. Our personnel need access to the internet to do their jobs.
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masnrockCommented:
That's right, Comcast only provides "business gateways". A standalone modem is more like the type of modem you would find in a house. Some cable companies like cox will let you use those.

Another option would be to buy a something like a sonicwall and configure your existing Comcast device as a passthrough. That way you'll won't be very dependent on Comcast equipment, except for connectivity.
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Ron IndyAuthor Commented:
Having not heard anything from ComCast, I've ordered a ZyXel ZyWall 110. This should allow us to depend on ComCast equipment only as a modem while upgrading the VPN to SSTP. Some of our people used to have problems connecting through their ISP and SSTP should help with that. Still, it's an expense we certainly didn't budget for.
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masnrockCommented:
Yes, unfortunately that is a pain in the neck. But Comcast does not make people's life particularly easy, forcing you to get units from them rather than having the option to buy your own, etc. And of course, they do not exactly give you a choice in the units you get. But that is why I tend to recommend the set up you have now versus depending on their equipment for network services. However, now that you've made the improvement that you have, there should hopefully be no more issues.
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Ron IndyAuthor Commented:
We bought the ZyWall and it has been complicated to setup. Not sure I would recommend it.
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