Hello Alexandr,
If AVG Firewall is blocking some of the communication then follow below mentioned steps to check whether it fixes the issue:
1) Open AVG Internet Security dashboard, click on "Menu–>Settings–>Components–>Firewall–>Customize"
2) To the right of "Policies" scroll down to click on "System Rules"
3) Enable the option for "Windows file sharing and printing", "allow remote desktop connection" and the last entry "Enable stealth mode"
4) Below policies, click on "Network Profiles", to the right - click on the network connection and change the profile to "Private" if it is set to "Public".