This error usually occurs when there is a syntax error in the .htaccess file on your webhotel. Errors in .htaccess files may occur if your page has been compromised or you or your CMS have entered invalid commands in it.
Rename if necessary. .htaccess file to confirm it is the one that causes problems, check and correct the file for errors.
The error may also occur if there is a PHP code error on the web site and PHP errors are set to be hidden.
Article from the support category: PHP
We strongly advice you to choose another password
The entered password is known in "Have I Been Pwned", which is a public database of leaked passwords on the internet.
Probably you (or someone else) used the password before on a website, which is known to have leaked the password. It is not safe to use this password.
We strongly advice you to choose another password.
Enter your password here for more information: https://haveibeenpwned.com/Passwords.