I've been a Comcast Business Class customer for over 3 years using the same device a Cisco DPC3941B
Hi there, thanks so much for taking the time out to reach out to the Digital Care Team here through the forums. I am so sorry for the delayed response. I know that having reliable internet is super important and you have reached the right team to help get this taken care of. Can you please send us a private message with your name, the full address, and the phone or account number?
To keep a log for everyone else who may read this.
I provided my account details to the Comcast rep via PM today. They replied shortly after basically reporting exact behavior that I elaborated in my original post (inability to add a port forward for an IP outside of the DHCP scope) and asked me to confirm that was in fact the problem.
I confirmed that was the problem and currently awaiting a reply.
Today marks day 9 since my original ticket was logged without a resolution.
13 days and counting - I have lost what shred of patience I had left.
I officially give up on any support from Comcast. If I had an alternative I would drop you like a bad habit. Your "business class" use to hold value because of the support it provided. Support is non existent now! I honestly lost track how many times I called for help - I'd say over a dozen. With half a dozen PMs here with nothing but the same lip service! "Someone will be in contact". PATHETIC!
I resolved the issue myself by taking the offending constant out of the equation - the modem...by putting it in passthru mode and using an Untangle Firewall instead of their hot garbage hardware.
In my opinion the issue lies in your modem and the software/firmware. Something changed as of recent and clearly specific functionality that existed in the past no longer does. Thanks for the frustration Comcast.