Setting up a server on ubuntu

Hi

I have a mini PC. It used to have windows11 on, and run the backup server for urbackup fine most of the time. It started being weird recently, so I thought I’d take the plunge and wipe it to put ubuntu 24.04 on, which I’m more comfortable with. . On the SERVER, I have:

sudo ufw statusStatus: active
To                         Action      From

22/tcp                     ALLOW       192.168.1.11155413/tcp                  ALLOW       Anywhere55414/tcp                  ALLOW       Anywhere35623/udp                  ALLOW       Anywhere55415/tcp                  ALLOW       Anywhere55413/tcp (v6)             ALLOW       Anywhere (v6)55414/tcp (v6)             ALLOW       Anywhere (v6)35623/udp (v6)             ALLOW       Anywhere (v6)55415/tcp (v6)             ALLOW       Anywhere (v6)
On the client, I have:
ACCEPT     tcp  –  0.0.0.0/0            0.0.0.0/0            multiport dports 35621,35622,35623,55415
ACCEPT     udp  –  0.0.0.0/0            0.0.0.0/0            udp dpt:35622

However, when I add via:

It doesn’t seem to find it:

Can anyone point me in a direction to test? I have another backup PC running Win11, and that is still backing up fine - so I’m pretty confident its not a router/ ISP issue.