It’s a 10 Gbps connection, which is likely why they increased the MTU size. But it does not look like a user-editable setting on the router, even in “expert” mode.
What can I do to get remote access back, if anything?
MTU shouldn’t matter for remote access. An MTU of 9600 just means the layer 2 frame size can go up to 9600. I have 1G fiber here in the USA and my MTU is set to 1500 for my WAN but I do use jumbo frames on my LAN. Port forwarding is what makes remote access work. Double check your Plex settings and your firewall/port forwarding.
I’ve been testing around with various ports and port ranges but it seems the port mapping setting on my router never takes effect, despite saying the rules are active…
That looks correct. I’m not sure how your router works, but try using just 1 of those blocks w/ the port# in it for public & private. With w blocks it looks like you’re trying to set a range and you just want 1 port 32400.
Those look correct (you still need the range for just one port). To ask a basic question- is .5 the correct IP for Plex and is it actually listening on that IP. You can check that in the network settings, you may need advanced. Also double check the port settings on the remote access page.
You might wanna check with your ISP, whether they even assign their customer’s routers a publicly-accessible IPv4 address.
Because if they don’t, your portforwarding won’t work.
Most ISP’s nowadays employ Carrier-Grade NAT für IPv4 and only give out publicly-accessible IPv6 adresses. Which are not usable by Plex, unfortunately.
Very good point. I believe my ISP is exactly as you described. Would a dynamic DNS server be helpful here?
Also, remote access appeared to work briefly, yesterday. A friend had a look and added a secure inbound rule on the Windows machine running Plex Server, like this:
Just as a followup, here’s what my ISP has to say about IPv4:
Firewall and signal
Do I need fixed public IPv4?
If you are a standard user who needs internet access to browse the web, shop online, access your email, cloud service, etc., you can continue to use the standard IPv6 option seamlessly.
Advanced features such as access to your network via the Fiber Box and port forwarding are possible with the IPv6 protocol.
If you need to set up a service accessible via internet with a hardware, which does not support IPv6 yet, you can request the activation of the public IPv4 address option (CHF 9.95/month).
If you wish to have a fixed public IPv4 address, contact our customer care at 0800 700 500 (+41 78 700 50 00 from abroad).
There is no need to do manual changes in the firewall config.
All you need to verify is that the network connection has been classified as “private” by Windows.
I have no experience regarding the jumbo frames issue, unfortunately.
Maybe you could search in this forum for this term.
Meanwhile, a friend who uses my Plex via remote access reports that everything is working for him–somehow. PMS reports that remote access is not working and any port checker tools on the web also report that port 32400 is CLOSED from the outside and yet it still works for him. It also works for me when disabling wifi on my phone and trying via 4G/5G.
There is a warning that direct play is not possible this way but it still works. I don’t know the difference between direct and indirect play but will read up on this in Plex documentation.
