I’ve had remote access working on my plex server for years but yesterday it stopped working. My ISP uses CG-NAT but that hasn’t been a problem until remote access stopped yesterday. To be perfectly honest I dont kbow how it’s been working as from what I understand it shouldn’t, but it has been. The server is running on an Intel Nuc that uses Mint. I’ve been using it both to listen to music and watch media without fault from friends/family homes and my phone remotely. Everything works perfectly inside the network but nothing remotely anymore. I’ve tried both with and without a port forwarding rule on my router. I have pihole running on the same nuc which I’ve tried both disabling and removing from the routers dns handling. I didn’t think this was the problem but I at least wanted to rule it out. Im fast running out of ideas as i can’t understand what’s different from before. The only thing that’s changed on my network is adding a new Switch 2, besides that everything is exactly the same. If anyone has any suggestions I’d really appreciate it!
Then the device from your ISP is not bridged. You may have to reach out to them and have them properly fix it.
The magic phrase I used in IT for years that got the point across: “I need to bridge your provided gateway so that it acts like a modem. It should provide one public IP directly to my own router with no routing in between.” This usually gets through to them that you know what you’re talking about and what you’re asking for.
Many providers are required to give you a schpeal about how this is a security risk and make it sound scary, but just accept it and move on. The rare provider is terrible and literally will not let you bridge their hardware, and to that, I hope you have at least one other option available to you.