Tattelecom

Russian ISPs Begin Disrupting Encrypted DNS Services from Google and Cloudflare

Users of several major Russian internet providers have reported widespread issues accessing encrypted DNS protocols offered by Google and Cloudflare. The affected services include DNS over HTTPS (DoH) and DNS over TLS (DoT), which are designed to prevent providers from inspecting domain queries. Measurements show that connections to Cloudflare addresses 1.1.1.1 and 1.0.0.1 on port 853 establish TCP handshakes but are then reset with ECONNRESET errors before TLS authentication completes. Google Public DNS endpoints experience different interference, with sessions stalling after the TLS ClientHello or terminating with unexpected EOF errors. The disruptions have been observed across Rostelecom, Dom.ru, Tattelecom, and SkyNet subscribers, with varying impact depending on region and operator. Tattelecom support reportedly advised one customer to disable both protocols to restore connectivity. No official confirmation of centralized blocking has been issued, yet the coordinated pattern across multiple providers suggests deliberate interference rather than random failure.