[MontyJ]

Yes, on the RPi with Chromium, and on my main PC on the same network with Firefox and Chromium.

If I use port 80 on the RPi, I do get the Apache2 "welcome page", so Apache is working. So I need to get 8083 to connect. When I do run "cps", I can verify it is running as a process, so it should be available on 8083, as it was setup before on that port and as far as I know, the cps settings have not changed.

I access the RPi directly (keyboard and monitor, through SSH, and via my main Linux PC to the desktop so have lots of connection options.

EDIT: Here are the files I suspect need updating in some way to get Apache to serve port 8083. Looking at their contents, I can see no reference to that port, but perhaps I am looking in the wrong place. Here are the files:
pi@raspberrypi:/etc/apache2 $ ls -ltr
total 84
-rw-r--r-- 1 root root 320 Jun 8 2022 ports.conf
-rw-r--r-- 1 root root 31063 Jun 8 2022 magic
-rw-r--r-- 1 root root 1782 Jun 8 2022 envvars
-rw-r--r-- 1 root root 7224 Jun 8 2022 apache2.conf
drwxr-xr-x 2 root root 4096 Jan 18 2023 mods-enabled
drwxr-xr-x 2 root root 4096 Jan 18 2023 conf-enabled
drwxr-xr-x 2 root root 4096 Jan 18 2023 sites-enabled
drwxr-xr-x 2 root root 4096 May 10 2023 conf-available
drwxr-xr-x 2 root root 16384 May 10 2023 mods-available
drwxr-xr-x 2 root root 4096 Mar 21 09:12 sites-available

Monty