You have dual 10 GbE links to your switch but want to run 1 GbE as the primary ?
Single interface per subnet is how this needs to be done because of QNAP limitations.
You got lucky until now but QuTS / QTS 5 changed a lot in the stack.
I have 2x 10 GbE NICs and 4x 1 GbE NICs in my TVS. I don’t use the 1 GbEs at all.
20 GbE to the core switch for everything here is plenty (even with all the support, development, and testing I do)
20 GbE for Home/ Home-Office is a lot of juice 
It’s a good point. When I got the 1688 a few months ago, i had set up the default interface to be a stock 1 GB ethernet interface. I’m using my Unifi Aggregate switch for 10 GB interfacing which I already have. I didn’t make it default since I wasn’t sure how good or stable it was going to be but it’s been great so far. So I really don’t need the old interface. I can try to go without it and see if there is any difference.
I would go without
To keep IP addresses…
Get into the QNAP using the .25 address
Change the .24’s address to be .199 or something WAY out of the way
As last step
– Make the .25 (bond0) the default gateway (force it)
– Assign it the address of the 192.168.0.24
As QTS switches addresses. that .25 browser window will go dead. Reopen as the .24 now on BOND0
You have the fail-safe of the gigabit adapter up at that 192.168.0.199 / whatever address in case you fat-finger it.
Unplug the single gigabit.
Restart Plex 
( I did this same sequence when I added both NIC cards. slick as wet ice )
The Unifi equipment gives the QNAP the same addresses through DHCP by configuration. All I have to do is disconnect and either ask the control panel to change the default interface or just reboot without it.
Turn off the DHCP.
Servers should be static.
–OR–
Go change the MAC reservation in the Unify DHCP server.
Sorry for the delay. My DB file is 194mb.
After PMS stops,
when your restart it,
wait 2 minutes
Grab the logs ZIP file please
Please attach here
Logs.zip (4.3 MB)
Last night was the first and only time the memory issue has happened, and this is the logs from after I rebooted the NAS and started-stopped-started Plex from the QNAP apps section. After attempting to start it the first time I got an error stating it hadn’t been shut down correctly before.
Sorry for the delay. I took a break from debugging to lie down for a short bit after rebooting the NAS after removing the gigabit interface, setting the bonded 10gb link as default and rebooting the machine. When i returned, the machine was up but not talking to anything. I reconnected the gigabit line again and was able to get control of the NAS again. (pinging the bonded link was failing even though the Unifi dashboard said everything was fine). Will report back when the thing comes back from a POST.
An update. I finally have it configured so that the only hard interfaces are the dual 10gb Ethernet ports that are bonded back to the Unifi. It’s communicating well and is now the default path back to the Unifi router. The Interface 1 connection is disconnected and not in the configuration. I did have a Thunderbolt connection back to a Mac sitting next to the QNAP which is also disconnected now.
And so far, the PMS is still not speaking to anything. On the other hand, my two VMs (Win Server 2019 and Ubuntu Linux) are both communicating through s virtual switch on the QNAP as configured. Roon Server is also communicating properly through the network. Everything seems to be working except for Plex.
Any more ideas?
Please grab current (fresh grab after startup – waiting 2 minutes for it to stabilize)
If nothing shows there, I will send you a PM so I may examine your Preferences.xml
I’m starting to suspect you have a “Preferred Interface” which is causing everything to be ignored.
Here are the current logs.
Logs 2.zip (1.7 MB)
PMS 1.25.2 just installed and everything works nice for now.
Will see how it will behave with next update.
PMS 1.25.2 is still not working for me. This close to uninstalling and starting over.
@ChuckPa got me working again. Thank you!!!
Today my plex was unreachable (same version I downloaded on 12/12 from plex.tv 1.25.2), I stopped it on QNAP, restarted it, zipped logs folder. It’s here below, thanks @ChuckPa .
Logs.zip (4.1 MB)
Quick check – Do you have NFO files anywhere in your media ?
Yea, a long time ago I used to use a cataloging software for on and offline media that made use of those. Should I remove?
I you can easily create a test library,
1 video item
1 NFO in it
Scan the library
Make it crash
That’s perfect to reproduce. If you can do it, i should be able to as well.
May I have the NFO if you do recreate this way?
I’ll see if I can play around a bit after the holiday, thanks! However, I may also just delete all the NFOs, they are just old files I don’t even need anymore that basically pointed to TVDB IDs =).
