Error when trying to connect (Host violates local access rules) - Onlyoffice

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Solution is given in below Link

Can't connect to OnlyOffice document server after update to NC19

It happens in new version of nextcloud, that checks local for dot (.) in adress if there it is: /lib/private/Http/Client.php -> preventLocalAddress // Disallow hostname only if (substr_count($host, ‘.’) === 0) { … The solution: change local address with dot included address: for example local.cloud