Comcast and Remote Access Problems

Channels DVR Server
#1

I have just switched from AT&T Uverse to Comcast Internet. My DVR remotely, web UI and Through the iOS App, worked fine on ATT. However, I am unable to connect to either when I switch the network to comcast.

My setup. I have a standalone mode which connects to my own Wireless router. I have bridged the router to the att equipment or comcast modem. On comcast I have full internet access and service.

On the local network I attached to WebUI and can verify that the DVR software is listening on the new comcast IP address. If I switch back it switches back to the old ATT Ip address and works. But with the comcast IP address I cannot connect remotely to the web UI. Internally the IP address of the DVR does not change because it is coming from the Router.

I can also verify that I can remotely, SSH or ScreenSharing, access the DVR computer via comcast or ATT network.

Is there something that needs to be reset on the DVR when I switched to Comcast?

Oh, I also verified that I could telnet remotely to the Comcast IP address and Port 8089 to rule out comcast blocking that port.

#2

Is the Comcast modem just a modem: ie: you own it? Or do you have a modem/router combo as Comcast would rent out to customers?

You said your wifi router is bridged to the modem, which would not normally be possible since the modem has a public IP. It must be a modem/router combo. Due to this, you need to redo the port forwarding on the Comcast modem/router, and forward those ports to your wifi router.

#3

I am also using Comcast. Here is my config:

  • Modem is a Netgear CM1000 Docsis 3.1: coax goes into the modem. ethernet out to Ubiquity EdgeRouter.
  • Router is Ubiquity EdgeRouter ER-X. eth0 is internet in via ethernet: a public IP in from the modem. eth1-eth4 combined to switch0. switch0 has internal LAN IP. All ports that need to access internal servers are forwarded on the EdgeRouter. A separate gigabit switch is connected to eth1 on the EdgeRouter.
  • Netgear ProSafe GS116NA: this gigabit switch connects via eth1 on the EdgeRouter. Wired network devices are connected to this switch. Also have a WiFi access point connected here.
#4

It is a modem that I purchased. Not renting from comcast. Maybe I misspoke about the whole bridging thing. The router does not need to reconfigure the port forwarding. I had a domain registered to my DVR before Channels setup their own ssl certs. That domain is working and I can get to my DVR via my own domain on Comcast. On ATT I could use BOTH the channels domain and my domain to get to my DVR. I validated this by changing my domain to point to Comcast public IP. and then Changed it back when I reverted to ATT. I have both services right now as I verify that all my services on ATT work with Comcast before I turn off ATT.

Do you think I need to reinstall the channels DVR so it can recreate the ssl cert for Comcast?

#5

Are you testing from inside your own network or outside your network? When I’m inside my network (also Comcast) I can’t get the channels domain to resolve and connect to my DVR, but I can from outside my network.

#6

The ssl cert is linked to a domain name, not an IP address.

I don’t use the channelsdvr.net domain name to access my DVR, so I haven’t tested this. But the channelsdvr domain must be doing some kind of DDNS updating to link it to your public IP. Did you try stop/starting the remote DVR service after connecting the Comcast modem?

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#7

From outside my network. I use my cell phone to test the iOS app and then web App. Also, I have tried from a coffee shop as well.

#8

I will try the restarting to see if that makes a difference.

#9

That appeared to be the fix. It took a couple a toggles of the switch for it to stick. But it is working again. Thanks @djcastaldo

#10

No problem. You will probably have to do the same thing again if your Comcast IP changes (it is issued from the ISP via DHCP).

#11

Toggling the remote access checkbox will refresh the IP associated with your remote access domain name.

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