aaPanel_Kern The problem occurred during the migration to the new aapanel firewall after the panel update. I had many country and IP blocking rules, and it seems something conflicted; I can't explain why.
I deleted all the blocked country rules (my country wasn't on the list) and the listed IPs, and everything started working again.
I also removed the SYS application that was installed because I don't know if they work together and it was causing a conflict. I activated the firewall using only the Security menu.
Is this Security module sufficient, or do you recommend keeping SYS installed?