Visitor
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14 Messages
VPN Not Working
I have the same problem like many others with VPN over Xfinity. None of my three laptops can VPN from home to work. But they work if I switch to using signal from my T-Mobile phone with USB tethering.
Laptop #1 was working with VPN for several years and stopped working about 4 months ago. When it worked, it only worked with ethernet cable connecting directly to Xfinity cable modem. Did not work with Wifi signal. During the time that laptop#1 was working flawlessly with Xfinity, I could not get any other laptop to work with VPN. Even more strange, for a short period of time, it did not work if I connected using the pop up screen from the Windows taskbar network icon. I had to connect using the VPN screen under the Windows Settings App.
Laptop #2 was bought recently and able to VPN "ONCE and just ONCE" about 2 months ago (during the time that laptop#1 did not work) but then stopped working. The only way to get VPN to work is to use my T-Mobile phone network through USB tethering/hotspot.
Laptop #3 has never worked with Xfinity. Only works with phone signal through USB tethering/hotspot.
Deactivating xFi Advanced Security does not help.
Several employees at our company have same issue. They can't connect to work through VPN from home.
Furthermore, I am the sever admin. I know for sure it is not the server issue.
I have fought this issue for several years with countless internet researches to no prevail. The problem is so random, that it is hard to pin down to Xfinity. But I wish Xfinity subject matter experts can look into this and helps us out. All tips that I could find from this forum have lead to the dead end.
Jlavaseur
Problem Solver
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948 Messages
4 years ago
So, i use several different VPNS on Comcast, most of them work without a issue, here is a couple of of variables to think about, a VPN can use a couple of different protocols to connect to the VPN, example, tcp or udp etc, different protocols can be slower or a lot faster, you can usually set them in the settings of your VPN, the thing is every different protocol might not work, you have to experiment to see what really works for your VPN, i have found some of the faster ones might quit working because different VPN server locations might or might support them. Then there is server locations, on my VPNs i can pick a location anywhere in the world, so occasionally one might quit working, it might show connected but its really not, i just change to a different location and i am up and running with a few clicks, some VPNs have what is called a 'kill switch', so if it looses connection it blocks all internet traffic, that way you don't unknowingly send maybe sensitive information over the internet if your VPN fails. You have to examine what is set by default on your particular VPN and maybe adjust some setting. I have had them working for months/years then quit working, i just check what i posted above and usually its fixed with a few clicks, just a thought
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hsmith199
Visitor
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10 Messages
4 years ago
It sounds like this is a company hosted VPN. If so, you will also want to involve your IT Dept. in the troubleshooting. Depending on the way the VPN is set up, you could have several blockers on the company side. Such as only having one device connected at a time or only being able to connect with a trusted device. There are even variables of how many people can be connected to the VPN at one time for certain providers / equipment as well.
With that said, it would be very hard to troubleshoot without seeing the event logs from the VPN company side on the connections.
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ChauBaby
Visitor
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14 Messages
4 years ago
Tried with new gateway address 192.168.0.1 today but no still no luck. May have to revert back to 10.0.0.1.
It was suggested that the VPN provider GoDaddy may be blocking Comcast assigned WAN / public IP address for whatever the reason may be. I will contact Goddady and see.
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ChauBaby
Visitor
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14 Messages
4 years ago
Spending the last couple days to crack the VPN issue with no success, I finally ran to Xfinity store today and swapped my XB7 modem with another XB7 as suggested by Xfinity Support as well as having my internet plan upgraded from 400/10 to 600/20. Just to try my luck.
All computers are now able to establish VPN connection to the remote server. But only one computer at a time. Apparently only a single tunnel can be established between the two ends. All computers work fine with ethernet or WiFi connection.
The problem was definitely on the home Xfinity. May be a bad modem. Or may be just a hard reboot. Or may be some configuration changed with a new upgrade. I will plug back the old modem in to test it out at some point just for curiosity.
Wireshark is an extremely useful tool. In my case, it helps to confirm my home computers are talking to the VPN server through real time packet transmission between the two ends and not just dead somewhere.
Thanks for all the help from the Xfinity Support team.
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ChauBaby
Visitor
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14 Messages
3 years ago
Something blocks my VPN from home to work. I highly suspect the issue is within Comcast.
This is the third time I have to swap the xFinity modem at home in order to get VPN to work. Literally just to get the modem to redo the set up. After each set up, the modem got a new WAN IP address. The WAN Default Gateway address was sometime the same, sometime different.
I can eliminate the computer being the issue because I have two computers at home. Either both work or don't after each modem reset.
I can eliminate the work server being the issue because I am the server admin. I do not block any address.
When VPN is not working through Comcast network, I can manage to get VPN connected through my mobile network.
Hate to point a finger to Comcast without a direct evidence, but by elimination, it points to Comcast.
My temporary fix right now is keeping two xFinity modems and manually swapping them when VPN is not working.
I hope VPN user having similar issue can try this fix and share back the result.
Many people having VPN issue. Not just me.
https://forums.xfinity.com/conversations/your-home-network/urgent-vpn-not-working/602daf72c5375f08cd0c69d7?page=1
I hope Comcast can look into this. They have insisted that they don't block anything but they seems to know there is an issue.
https://forums.xfinity.com/conversations/your-home-network/vpn-blocked/602db078c5375f08cd2f1666
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crocknroll
New Poster
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2 Messages
3 years ago
Let me ask, is the home user using comcast as thier isp and is also the destination network using comcast isp? I am running into an issue where vpn works fine except for specific ips in the 10.1.10.x subnet. The home users have a 10.0.0.x ip. Im thinking that the destination router has a 10.1.10.x subnet even though it is in bridge mode and might be causing the issues. Im going to dig into it today.
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