inbound port blocking
I use a Meraki MX64 firewall, which supports a L2TP based VPN. Previously I have been able to VPN back to this equipment while on the road, so I know that my firewall and client setups are correct. However since switching to Comcast I can no longer do so. Connection from the outside simply time out and according to the VPN logs on my firewall a connection never makes to the device to even log. I can ping the firewall, so basic connectivity is there.
So, is Comcast blocking inbound ports, specifically ports 500 and 4500 for UDP traffic? If yes, who can I reach to release these ports to the house?