Fail to enter Plex Media Server Initial Setup After Install On RHEL 8

Server Version#:plexmediaserver-1.23.1.4602-280ab6053
Player Version#:N/A

Abbreviation Key:
FQDN = Fully Qualified Domain Name
BYIPADDR = Media Server Inside Address

After installation has finish, I attempt to do the initial media server setup. I never reach the setup page but instead go to this page after I enter my email address and password.

http://:32400/manage/index.html#!/
No server settings are available on the page above.

How do I reach the setup page?

On the Sigin page the following message appears:
This application is at and is not hosted by Plex. Continue only if you recognize this server and wish to grant access.
and
This application is at and is not hosted by Plex. Continue only if you recognize this server and wish to grant access.

These are the two URLs I have tried

http://:32400/web
http://:32400/manage/index.html#!/setup
&
http://:32400/web
http://:32400/manage/index.html#!/setup

I am on RHEL 8 update 4

I am trying to access the server from a MS Win 10 Machine on the same network
and using Chrome or Firefox or Opera.

selinux status is permissive and was permissive during install

the firewalld service is off

Permissions on the directories are /var/lib/plexmediaserver/Library
drwxr-xr-x. 3 plex plex 21 May 30 00:03 plexmediaserver
drwxr-xr-x. 3 plex plex 33 May 30 00:53 Library

The server listens on these ports:
##================================================================
tcp 0 0 127.0.0.1:32600 0.0.0.0:* LISTEN 1688/Plex Tuner Ser
tcp 0 0 127.0.0.1:45219 0.0.0.0:* LISTEN 1957/Plex Plug-in [
tcp 0 0 127.0.0.1:38027 0.0.0.0:* LISTEN 1950/Plex Plug-in [
tcp 0 0 127.0.0.1:41099 0.0.0.0:* LISTEN 1840/Plex Plug-in [
tcp 0 0 127.0.0.1:33423 0.0.0.0:* LISTEN 1955/Plex Plug-in [
tcp 0 0 127.0.0.1:32401 0.0.0.0:* LISTEN 1607/Plex Media Ser
tcp 0 0 127.0.0.1:43669 0.0.0.0:* LISTEN 2043/Plex Plug-in [
tcp 0 0 127.0.0.1:35127 0.0.0.0:* LISTEN 1633/Plex Plug-in [
tcp6 0 0 :::32400 :::* LISTEN 1607/Plex Media Ser
udp 0 0 0.0.0.0:1901 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 10.xx.xx.xx:48131 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 127.0.0.1:50422 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 10.xx.xx.xx:39322 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 127.0.0.1:33424 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 0.0.0.0:32410 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 0.0.0.0:32412 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 0.0.0.0:32413 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 0.0.0.0:32414 0.0.0.0:* 1607/Plex Media Ser
udp 0 0 10.xx.xx.xx:52956 0.0.0.0:* 1607/Plex Media Ser
##================================================================

Logout Plex on the top right, stop de service.
In /var/lib/plexmediaserver/Library/Application Support/Plex Media Server rename Preferences.xml to something else and then start the service

Open 32400/web

To add;

http://127.0.0.1:32400/web

or

http://same.subnet.ip.addr:32400/web

FQDN, non-RFC1918, nor cross-subnet access is allowed to claim via the web due to PMS default security mechanism. Alternate method is available.

Your directions worked following these steps with RHEL 8 Update 4:

  1. Logout of the Plex Media Server, upper right corner of the web page
  2. Stop the Plex service, systemctl stop plexmediaserver.service
  3. Rename the preferences file, mv Preferences.xml Preferences_20210530_1801.xml
  4. Make sure that you are on a flat network, ie the same subnet
  5. Set SELinux to permissive for this initial Plex Server configuration, setenforce 0
  6. Start the Plex service, systemctl start plexmediaserver.service
  7. Access the server with the loopback address, 127.0.0.1, or the same.subnet.ip.addr
  8. URLs: http://127.0.0.1;32400/web or http://same.subnet.ip.addr:32400/web for installation
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