It's not a DNS block, since I tried to change them and also ping directly some IPs. Pinging a IP from the modem gives "Request timed out". I'm connected via WireGuard; maybe they are blocking TCP connections, or selected ports.

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Hmm, In that case if you have the motivation, id try some port knocking and see what happens. Otherwise yeah, could be TCP specifically, although I can't see a case where they would want to block blanket L4 traffic like that.