Why don't Yandex, Avito, and government portals work when a VPN is turned on?

LOCAL REGIONAL PORTALS BLOCK INCOMING CONNECTIONS FROM FOREIGN SERVERS.

To protect against spam, automated scraping, and DDoS attacks, major local services block access from foreign hosting IP addresses. Trying to visit them with an active foreign tunnel will result in an access error or an endless captcha.

Foreign Traffic Filtering by Local Services

Security systems of regional platforms track the geographical origin of IP requests and the type of network (datacenter vs. residential ISP). Requests coming from foreign hosting platforms are flagged by defense algorithms as potential threats, resulting in 403 Forbidden errors or forced session resets.

How to Set Up Convenient Browsing

Enable Split Tunneling and add local services to your exclusion list
Use built-in domain-based routing lists (.ru, etc.) in your VPN client
Connect to a server with a local IP address if you need privacy without changing your region
Turn off your VPN connection while using local classifieds and marketplaces