Cannot connect to VPN

Question

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!

VBSSP-RICH · Accepted Answer

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 · Accepted Answer

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?

VBSSP-RICH · Accepted Answer

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.

Ray5 · Answer

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.

Equipment

catsine

Cannot connect to VPN

VBSSP-RICH

catsine

VBSSP-RICH

Ray5

Comcast_ThomasD