I have the same setup as you have, @mintakax . Using a Windows 11 laptop to connect with my PA 3100HV with APM boards (mounted these myself). I changed the address of my fixed web connection and used a regular UTP cable to connect.
Alas, after being able to connect once, I can’t make it work anymore. Fails with a rather funny remark: can’t load channel "" I can still ping the unit btw.
Is it still working for you?