We had the same issue with Avast, and installed Bitdefender Endpoint to overcome this issue.
Got it to work, while we are on-site, but within a short time span, Avast ruins comms again.
We got Avast to work, for some time, but it interfered with both UrBackup and Tactical RMM software.
Thank you for your solution, I should have set the IP, as you indicate.