Server Version#: 1.23.6.4863
Player Version#: 4.59.2
I’m on Ubuntu 20.04. Been having this issue for a week. For context, I have installed and reinstalled Plex several times while configuring this new install, so that may have something to do with it. Any help would be appreciated. Logs attached.
On a new install you can’t use app.plex.tv. You need to use the embedded Plex Web client that comes with Plex Media Server. Use the IP address of your machine http://192.168.4.159:32400/web or if you are using the machine itself, you can also use http://127.0.0.1:32400/web.
I’m not sure I understand. At what point can I start accessing the server via plex.tv? I am also unable to access the server via my streaming devices. Is this not a certificate problem?
Edit: attempting to access the server via its local IP as you suggested was not successful, unless I am using the host machine. The page does not load.
Taking a look at my logs, you can see there is a cert error:
Jul 27, 2021 20:14:01.494 [0x7f4e34d1fd30] ERROR - [CERT] PKCS12_parse failed: error:23076071:PKCS12 routines:PKCS12_parse:mac verify failure
Jul 27, 2021 20:14:01.494 [0x7f4e34d1fd30] ERROR - [CERT] Found a certificate, but couldn't install it.
Paging @ChuckPa
Your server needs to be claimed first. That’s what published your IP to plex.tv so it can access your server, otherwise it doesn’t know where your server is. Claiming your server is also what gets the security certificate.
I do see errors in your log about the certificate. Are you uninstalling and installing PMS multiple times? Your logs look like it’s trying to use old information that isn’t valid anymore. If you are doing this, make sure you check your authorized devices in Plex Web (either locally or at plex.tv) and remove any old servers. That can make things confusing. Then restart your server so it will update it’s current information properly.
We you attempting from another machine on the local network? Are you sure that computer is on the same network?
I do see errors in your log about the certificate. Are you uninstalling and installing PMS multiple times?
Yes, I have installed and reinstalled multiple times. I have made sure to clear out my old servers from my authorized devices.
We you attempting from another machine on the local network? Are you sure that computer is on the same network?
Yes, with certainty.
yoo hoo. 
Jul 27, 2021 20:14:01.494 [0x7f4e34d1fd30] ERROR - [CERT] PKCS12_parse failed: error:23076071:PKCS12 routines:PKCS12_parse:mac verify failure
Forgot the passphrase or have extra (not visible) spaces in what was typed into Plex ? ( this is the most common problem – bad password 
)
Cert does not match claimed domain?
CA included ?
Personally, I would leave all non-Plex certs out of the picture until normal operation is restored.
For giggles, what is that LAN subnet range? RFC-1918 compliant ?
Thanks for your reply! Hmm, I’m not quite on your networking ninja level Oddly, I am occasionally able to connect to my server via an indirect connection (even on my local network), but I can’t hit the server directly. For context, I never had issues running Plex on the same exact machine using macOS before I switched to Ubuntu.
Forgot the passphrase or have extra (not visible) spaces in what was typed into Plex ? ( this is the most common problem – bad password
Do you mean my Plex password? If so, I’m logged into my Plex account successfully on my host machine and on my client machine. Maybe you mean something else, though?
Cert does not match claimed domain?
Do you mean my local hostname? Would this be an issue in my /etc/hosts?
CA included ?
For giggles, what is that LAN subnet range? RFC-1918 compliant ?
I would need to try to figure that out. My network is just an Eero system.
Solved. I forgot I set up UFW.
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