Can't Access GUI after Reboot

I’m a new user. Installing FreePBX 17 on bare metal with Debian 12. After initial install, I ran the setup wizard and started setting things up. But decided to reboot as a verification – I usually do that on new installs. But after the reboot, I couldn’t access the GUI. The machine is fine, including SSH. Disappointed, I rebuilt the whole machine down to the OS. Same thing happened again. Now I’ve learned that if I run the install script again, I regain access and everything looks fine, but only until I reboot again. Did I miss a step somewhere? Thanks in advance for any assistance here!

Does the web UI page itself is not opening or you are getting any whoops error? if page itself not loading then check your network/firewall settings.

Thanks, It can’t be a network or firewall issue since I was able to access the GUI after install but not after a reboot. Then again after a re-install access returns. This has something to do with FreePBX itself.