Moved house and now Plex won't connect to Synology Libraries

Server Version#:1.24.5.5173-6000
Player Version#:4.63.0

I’m on a Synology DS920+ running 6.2.4-25556 Update 2

I’ve moved house recently and was setting things back up. When I opened Plex, my connection to my synology library was gone. I went to map it, and the mapping option is gone from the Plex interface. It is as if the whole thing reset somehow without me upgrading or changing anything other than my physical location.

I’ve looked and made sure my permissions still match the tutorial I originally used to set things up. It worked perfectly before.

I asked this question over on the synoforum and they indicated that my configuration is incorrect. Again, this worked perfectly previously.

My configuration is that I have a shared folder on the Synology called Plex. In that folder, there is a folder created by Plex called Library. My media files are in there. Please keep in mind, I am NOT on DSM 7.0. I’m still on 6.2 (current stable build).

Grateful for any help you can offer. Thanks.

That’s the same Plex folder with tons of different-language files indicating not to place your media in it?

Okay, I get the sarcasm. Likely deserved. However, I did this several years ago following a step-by-step tutorial that was obviously in error. I am not perfect.

Related: this has worked flawlessly until now.

@christyrm

When you moved the household, Did you get a new ISP / new modem router ?

If so, all the IP addresses are probably incorrect for the new modem/router

I did get a new ISP. It’s Starlink (previously had cable). However, I’m using my previous Asus router (running Merlin), and have made sure the Synology is using its previous IP address.

My suspicion is also running to the ISP, but I did try to mitigate that. I’m the first to admit I’m not a networking guru and I figure it out as I go along (which may well lead to me making dumb mistakes).

@christyrm

The most common change when switching ISP or equipment is that the modem/router’s IP address changes AND/OR the DHCP addresses it hands out are different than what you had

Example:
ISP 1 – uses 10.0.0.x for their default LAN addresses
ISP 2 – uses 192.168.0.x for their defaut
ISP 3 – uses 192.168.1.x as yet another variation.

This is the first thing you need to figure out.

Somewhere on the modem/router or with the documentation they gave you –
Should be modem/router’s IP address

Also, Since your computer can connect here, your computer knows.

Look at its IP address.
Now look at the Synology.

What’s different ?

Thanks so much for trying to help.

My router says that my WAN IP is 192.168.1.176
My NAS is on 192.168.50.218

Is it the x.x.1.x vs the x.x.50.x?

Please confirm?

  1. You have the ISP modem/router providing you 192.168.1.x IP addresses
  2. Between your ISP’s equipment and your NAS, you have your own router which is creating 192.168.50.x ?

Which things are connected to which modem/routers ? It sounds like you’ve got it split up between the two . If so, then that’s causing the problem.

The Synology is connected to my router the 192.168.50.x address. My synology has a static address on that router that is x.x.50.218 and I can reach the Synology just fine using that, so long as I’m on the wifi (or hardwire) directly connected to that router. So I log into my synology and open PMS from that interface and this is where things go sideways. I’m on an IP tied to that router (not the ISP’s modem, which is the 192.168.1.x address), but PMS does not seem to ‘see’ me.

Does that make sense?

Yes, it’s starting to make sense. Double NAT is wreaking havoc.

May I see the Plex logs? I have the hunch that traffic is being blocked before getting to PMS.

e.g.

  • Connect from any *.50.x and it’s OK
  • Connect from any *.1.x and NADA

What are the IP addresses handed out to the WiFi devices ?

Please forgive my ignorance, but how do I pull the plex logs?

And, I am connecting from a *.50.x device right now. Via wifi. I can get to Synology, but not PMS. The router’s IP is *.50.1 (which I can also log into, so long as I’m on the wifi or hardwire for the router). AFAIK, I’m not touching the *1.x at all, except for getting out to the interwebs.

I can log into Plex, but it’s as if I’ve got a web client and not PMS. It suggests I download PMS if I want to add my own media, but that becomes circular logic.

Settings - Server - Troubleshooting (lower left corner) - Download Logs.

Attach the ZIP file it gives you here for me to look at.

PMS and clients find each other by broadcast packets. Broadcast packets don’t cross subnet boundaries (TCP/IP rules)

The split-LAN is killing you. This needs to become all one logical subnet.

Plex Media Server Logs_2021-11-25_13-29-55.zip (3.5 MB)

RE: split-LAN. I see what you’re saying. This is something I’m actively trying to learn about so that I can simplify things.

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