PMS SecureConnection enabling by editing Preference file on QNAP?

Server Version#:PMS ver 1.25.4; QNAP TS-453A ver 5.0.0.1891
Player Version#: iOS/AppleTV/Web/Plex App/All

I have been using PMS on my QNAP NAS for years and it had been running fine for quite some time. I updated my PMS to force secure connections only. I am currently unable to reach my local Plex Server via any Plex App, including the App on the QNAP.

I came across an article from 12/2021 stating how to manually update the Plex Preferences file to enable/disable certain features, with secureConnections listed among them. The file location is [PMS Path]/.qpkg/PlexMediaServer/Library/Plex Media Server/Preferences.xml
[https://support.plex.tv/articles/201105343-advanced-hidden-server-settings/]

Is this a viable way to regain access to the server? I am thinking of adding "secureConnections=“2"”. I’m a bit confused as to why this attribute is not currently in my Preferences file. Is there another PMS configuration file where this attribute is located?

Another method of recovering access that I’ve seen is less convenient for me, as I run my QNAP as headless and attaching a monitor/keyboard would not be trivial.

Any help would be greatly appreciated!

Value of 2 is no longer in use
Ref: Plex Media Server - #482 by drzoidberg33

Values used now are:

0 : Required
1: Preferred

And after changing, a restart of PMS is needed

In an SSH console, type:

$(getcfg -f /etc/config/qpkg.conf PlexMediaServer Install_path)/plex.sh restart

Or restart from QTS AppCenter

When said, are you sure that’s the problem, since mentioned clients should support a secure connection