Unable to connect to server 
Автор: X5 Croatia
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It happens suddenly at intervals, not always, but i notice more and more... Contacting my hosting provider everything works fine... Hm...
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Wrong picture in first post...
The new HTTP status code 451 indicates when a transfer is suppressed for legal reasons. Unlike 403 or 404, which can have many reasons, 451 explicitly draws attention to censorship.
What remains: Check the content and correct it if necessary.