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Cannot connect to VPN

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catsine
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Cannot connect to VPN

I use a VPN to connect to work. Lately I cannot connect at all. I have a Comcast Netgear CG30000DCR modem gateway. In looking over the forums,  there seems to be a lot of problems with this particular modem.  My VPN IT guys at work say it is not on their end. something with Comcast is blocking it and not letting me connect.  No one is helping me other than sayings it's the other guys problem.  Can anyone help me?  For work I use  Cisco VPN client, if that helps.   Thanks in advance!

Accepted Solution

Re: Cannot connect to VPN

Hello catsine and welcome,

 

I recommend that you make sure that the following ports, depending on your actual functional VPN operation, are open on your Comcast Gateway :

 

TCP/47 GRE,

TCP/1723 for PPTP,

TCP/1701 for L2TP,

TCP-UDP/500 for ISAKMP,
SSTP: port 443 TCP

 

This has assisted many VPN users that I am aware of.  

 

Hope this helps you out.

 

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Accepted Solution

Re: Cannot connect to VPN

Thanks for the reply, however, I am extremely Tech-challenged.  How do I do this? and would possibly buying my own modem (comcast compatible) be an option?

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Accepted Solution

Re: Cannot connect to VPN

Hi catsine,

 

Need to know more about your interconnectivity to the NetGear 3000 for example:

1. Is your computer just plugged into one of the LanPorts 1-4 ?

2. if yes to 1.) are you simply running the Cisco VPN client on that computer?

 

3. are you using any firewall or controlling router with or without built in VPN?

 

Purchasing your Customer Owned Modem (COM) is certainly an option but Comcast does not maintain or service any issues with  COMs. Comcast only maintains downloading the correct boot file for your internet tier speed. All other technical hardware, firmware, etc. issues will be need be handled the COM manufacturer.

 

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3 REPLIES
Trusted Forum Contributor

Re: Cannot connect to VPN

Hello catsine and welcome,

 

I recommend that you make sure that the following ports, depending on your actual functional VPN operation, are open on your Comcast Gateway :

 

TCP/47 GRE,

TCP/1723 for PPTP,

TCP/1701 for L2TP,

TCP-UDP/500 for ISAKMP,
SSTP: port 443 TCP

 

This has assisted many VPN users that I am aware of.  

 

Hope this helps you out.

 

catsine
Visitor

Re: Cannot connect to VPN

Thanks for the reply, however, I am extremely Tech-challenged.  How do I do this? and would possibly buying my own modem (comcast compatible) be an option?

Trusted Forum Contributor

Re: Cannot connect to VPN

Hi catsine,

 

Need to know more about your interconnectivity to the NetGear 3000 for example:

1. Is your computer just plugged into one of the LanPorts 1-4 ?

2. if yes to 1.) are you simply running the Cisco VPN client on that computer?

 

3. are you using any firewall or controlling router with or without built in VPN?

 

Purchasing your Customer Owned Modem (COM) is certainly an option but Comcast does not maintain or service any issues with  COMs. Comcast only maintains downloading the correct boot file for your internet tier speed. All other technical hardware, firmware, etc. issues will be need be handled the COM manufacturer.

 

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