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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年前

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年前

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年前

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.

 

New Contributor

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1 Message

4分前

I finally got through to a technician and they said the modem simply could not be put into bridge mode.  Our IT said that there is not another option but bridge mode if we wanted vpn.  Hence we will ride out the contract and switch to a more dependable and reliable service that offers bridge mode so we can remote into our server.   If they lose enough clients they will fix the issue or have a modem that will work in multiple modes without down time.  For now they can play the blame game.  We recognize it and will at some point hold them accountable via correct methods.

Official Employee

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5 Messages

Hi there, @Ray5. Thank you for your feedback and commenting here on the Xfinity Forums. It's important to us that you've got all the info you need to make the choices that will work best for you. Did you had a chance to come across this informative article regarding 'True Bridge Mode’ vs. 'Pass-Through Mode'?. And, as a quick reminder; Comcast Business customers can select devices from the following equipment list that are capable of running in bridge mode: equipment options. Please let me know if this info helps.