Shared internet connection - AVAST blocks http

Laptop connected to internet over WiFi router. Wireless connection configured as “shared intenet connection”. Ethernet (cable) ETH of laptop configured as “Homenetwork connection” (automatically selected ip 192.168.137.1). On the other end of cable is a linux desktop with ip 192.168.137.37 . The linux box can PING hosts in intenet (DNS adress resolution works, ICMP works) but i cannot access http.
When i disable AVST protection (“disable all protection for 10 minutes” in AVAST menu) linux box starts to work…
I already read some threads with similiar problems - all options in “SYSTEM RULES” (enable printer sharing and so on) are enabled. Linux IP added to “friends”, i tried to add a new rule in “Packet rules” that should enable all trafic - no effect. The only way to access intenet in my linux box is to diable all protectection of windows box - not funny at all.
Is there a way to enable more verbose interface for firewall configuration? (loging information which rule stopped particular connection could be very usefull in troubleshooting such problems)
Greetings
Gregor

Why not connect both systems directly to the router ?

Linux box works as CNC controller - i don’t want any hardware that’s not absolutely necessery in it - therefore no WiFi card. For cable connection it’s to far away from router. Internet connection is needed only for software updates - theoretically i can live with curren solution (disable firewall for 10 minutes) but it’s annoing…