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New problem solver

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4 Messages

Fri, Mar 28, 2014 9:00 AM

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

Advocate

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1.4K Messages

8 y ago

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.

 

New Contributor

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6 Messages

@VBSSP-RICH 

We are begging for support help.  I am sending this to every Comcast employee I can so that our Denver office can get back to work.

2021-The same issue in Denver, CO. 

Ticket CR-967966445

Comcast technical support had resolved the problem in May 2021 but would not share documentation of the fix.  Now it is November 2021 in the issue is back.  Every other network, hotspot, other non-Denver office location can access the server through VPN accept Denver office.

Comcast Business was a delight to work with during setup.  But technical support is no help and refuses to escalate to the next tier level.  Some have even repeatedly stated that  "if you can access Google, the problem is on your end".  

When I've contacted account reps that signed us up-CRICKETS!

There are forum posts on this from 10 years ago.  Why is there no protocol? 

Please assist with Ticket CR-967966445

Accepted Solution

New problem solver

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4 Messages

8 y ago

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?

Accepted Solution

Advocate

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1.4K Messages

8 y ago

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.