the modem is a Cisco EPC3212 which is standalone.
I contacted my ISP and they said that there was no block from their side and that the modem itself does not contain a firewall.
Well if your ISP told you that, they don't read the manuals of their own products. LOL
" Provides parental control and advanced firewall technolog" Page 11 of
this manual.
First thing you want to do is bypass the router and go direct into the modem and see if it works. My guess is it wont.
This person had the exact same problem, and it was posted just a couple days ago. Is that you? Anyway, couldnt get it to work direct to modem. If it doesn't work direct to the modem, then call your ISP call them out on it. Good luck