Exactly as described in this thread.

disabling ECN by “echo 0 > /proc/sys/net/ipv4/tcp_ecn” solves the problem, but only until the next restart as this change is only temporary.

in short all websites protected by Cloudflare return ERR_CONNECTION_RESET. The same on all different browsers.

The ISP provider is Comnet BG

The answers in the posted thread suggest an issue on your end. is one of the affected websites.

Let me know what other debug info you need and will be happy to provide.

All websites protected by CF return ERR_CONNECTION_RESET when accessed by any browser.

disabling ECN by running “echo 0 > /proc/sys/net/ipv4/tcp_ecn” fixes the problem, but only after the next restart as it is only a temporary change.

exactly as described in
which suggest an issue on one of CF routers. is an example of such website.

The ISP is Comnet BG

Let me know what other info you need and will be happy to provide.

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