I saw some Internet-based information systems on Czech railways down today. An information kiosk was showing Firefox’s “Address not found” error page, one train had no onboard Wi-Fi and no tickets were getting checked. A store I went to did not accept cards today, either. Trains were unusually delayed too, I heard at least 3 different vague reasons over the PAS (technical problems with train, diversion, unforeseen circumstances).
However, except for that train I was able to connect to various known networks and they all worked.