New Broadband Remote access no longer working (UK - Voneus)

[Wranglatang]

Server Version#: 1.32.8.7639

Hello, I have been using Plex for a few years now in the UK with Vodafone as my broadband provider. I have the Vodafone Router setup to port forward all traffic to my Unifi Dream Router and then my UDR forwards the relevent traffic to my server.

I recently changed provider from Vodafone to Voneus (Fiber) and Voneus gave me the PPPoE details so that I could plug the ONT (Optical Network Transmitter) directly into my UDR and not have to worry about setting up their provided router.

So I configured the UDR and was able to connect to the internet, but Im unable to get Plex working again.

This is what my Plex Port Forwarding rule is set to:

I was looking into the logs and noticed this error

WARN - [Req#7c] NAT: PMP, got an error: Not Supported by gateway.

I then looked again in the WAN Configuration of my UDR and enabled “UPnP” and “NAT Port Mapping Protocol”

Now when I boot up plex i see this in my logs:

WARN - [EventSourceClient/pubsub/RemovedIP:443] MyPlex: attempted a reachability check but we’re not yet mapped.
WARN - PublicAddressManager: WAN IP on router does not match public IP from plex.tv
ERROR - [EventSourceClient/pubsub/RemovedIP:443] MyPlex: mapping failed due to potential double NAT configuration

In the Remote Access page i see this (I have hidden my public IP):

What is listed as my Public IP does correctly match my real public IP address.

Has anyone seen this sort of problem before?
Does anyone have experience with my setup - Fibre Broadband, ONT Directly to Unifi Dream Router, Unraid Server, Plex running in a docker container.

I have also tried to run a brand new docker container for PMS but that has the same issue.

Also if i plug my vodafone router back in (reverting from fibre to coper) everything starts to work again.

[OttoKerner]

The newer the internet contract, the more likely it is that your ISP has put you behind a Carrier-Grade-NAT. Carrier-grade NAT - Wikipedia

Only your ISP can do something about that, and they do it only if they’re willing to. The incentive for them is of course money. Many will offer you a “static” public IP if you shell out more money.
(Technically, it is not necessary to have a truly “static” public IP, but that is what will bring you a publicly accessible IPv4 address.)

The Basics of Remote Access Troubleshooting

When it comes to remote access, there’s a lot of different factors which can impact your setup. Some are under your own control, others not so much. First off… there’s a dedicated support article on troubleshooting your remote access. I strongly recommend you have a look at that. Find below some additional remarks on how to troubleshoot your remote access setup. Review your internet access / remote access configuration It’s good practice to review if Plex gets the correct public IP address…

@Wranglatang

Also if i plug my vodafone router back in (reverting from fibre to coper) everything starts to work again.

If you do that, make sure to stop and restart your server machine and the plex server app on it afterwards.

[Wranglatang]

Thanks for the speedy response. So its the Carrier-grade NAT that is preventing the traffic from even getting to me?

@OttoKerner

@Wranglatang

Also if i plug my vodafone router back in (reverting from fibre to coper) everything starts to work again.

If you do that, make sure to stop and restart your server machine and the plex server app on it afterwards.

Yeah i had done that and plex did work fine, but I’m upgrading my BB package so i need to get it working with Voneus.

[OttoKerner]

@Wranglatang

So its the Carrier-grade NAT that is preventing the traffic from even getting to me?

This is the most likely reason with new contracts.
Whether that is true in your particular case, I’m not able to confirm. The linked post contains some methods to confirm that suspicion.

[Wranglatang]

Thanks again Otto. I spoke to my provider today and managed to get them to give me a static IP included in my package. Not sure how long it will take to set up but I will report back here once its in place and i have some results.