Fresh Server build, can't find PlexMediaServer

Server Version#: plexmediaserver-1.16.1.1273-4b6101f87
Player Version#: Web

Good afternoon All,
I am rebuilding a Fedora 30 Linux Server, I’m unable to get the install process to discover my server. The server is running:

[tmorgenthaler@galactica Plex Media Server]$ systemctl status plexmediaserver.service 
● plexmediaserver.service - Plex Media Server
   Loaded: loaded (/usr/lib/systemd/system/plexmediaserver.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2019-07-15 11:50:55 EDT; 1min 30s ago
  Process: 765 ExecStartPre=/bin/sh -c /usr/bin/test -d "${PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR}" || /bin/mkdir -p "${PLEX_>
 Main PID: 767 (Plex Media Serv)
    Tasks: 5 (limit: 4915)
   Memory: 7.9M
   CGroup: /system.slice/plexmediaserver.service
           └─767 /usr/lib/plexmediaserver/Plex Media Server

My gateway forwards the ports to 32400, as it did before the server build;

Jul 15 11:33:04 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=15083 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:33:07 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=2935 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:33:12 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=44510 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:33:58 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=34902 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:33:58 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=27322 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:34:03 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=10518 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:34:04 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=26775 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:34:04 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=46974 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 
Jul 15 11:34:09 UniFiSecurityGateway kernel: [WAN_IN-3004-A]IN=eth0 OUT=eth1 MAC=f8:e4:fb:aa:fe:28:00:01:5c:6b:c2:46:08:00 SRC=192.48.238.254 DST=192.168.1.72 LEN=64 TOS=0x00 PREC=0x20 TTL=48 ID=0 DF PROTO=TCP SPT=33867 DPT=32400 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0

Firewall is NOT enabled on the server, and neither is SELinux. When I attempt to go to http://192.168.1.72:32400/web, I get the Plex Logo, and it asks me to sign into my existing plex account. From there, it goes to the plex page, and begins “Looking for servers…”. It never finds it. I’ve been going through this for days, uninstalling, reinstalling, deleting the Preferences page, etc.

What am I doing incorrectly? My server worked fine before.

Sign your Plex/Web browser out first.
Open an Incognito window to it.

It will make connecting to the new (unclaimed) server much easier.
Plex/Web won’t be tempted to look for the old server at that IP.

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