Comcast internet VPN disconnects

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Comcast internet VPN disconnects

L0 Member

My company has not transitioned to GPCS yet and currently still uses Cisco AnyConnect. We have 10K+ remote users and 5weeks ago about 100+ users started getting random disconnects and they are all Comcast users with XB3 type modem. I wanted to ask the forum if anyone has seen this type of issue with GPCS as well ? I understand that there is a lot to the configuration, but just wanted to see if anyone can relate to this comcast issue using GPCS.


Appreciate any feedback!



NOTE: GlobalProtect Cloud Service has changed to Prisma Access.


Cyber Elite
Cyber Elite


It could just be ISP related. I know we were affected by the Comcast outage and it didnt matter which client the users had. Also make sure the firmware on those routers are up to date. Obivously it would probably be a good to test it out on a small group of users and see what they experience.


Just some thoughts.

L4 Transporter

Have you confirmed it works on Comcast with a different modem? I have seen issues with GlobalProtect working successfully through a couple specific modems used in Europe ISP markets. As soon as the user replaced the modem all was well. Prior to that connections were unsuccessful frequently or GP selected the wrong regional GP Gateway. AnyConnect to our Cisco ASA didn't seem to have any issues but I hadn't confirmed it was using IPSec vs SSL as the transport.


If you are using AnyConnect with xauth to a Palo Alto it would require IPSec but you could help exclude it being an ASA issue. Is it an IPSec or SSL AnyConnect connection dropping??


You might want to just setup a gateway for that user on GlobalProtect with IPSec disabled so it uses an SSL tunnel to see if that works more reliably for them until the ISP/modem issue is resolved (if ever).


I have offices on Comcast and have frequent drops but they are a Cisco router to PAN VPN gateway. We don't seem to have issues with PA to PA VPN's but have none of those on domestic cable modem based ISPs.

We know VPN connection is stable with XB6 modem. Someone on theComcast forum suggested to turn off DTLS on Cisco ASA, but I have not tried it yet.

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