I have a server powered by CloudLinux and LiteSpeed.
I have been using SFTP for about a year but after moving to v12 (currently I am on 12.3) the SFTP did not work any more and it turned to red in the admin section.
Your help is really appreciated
Here are the related errors from the NextCloud Log:
Cannot connect to sftp.your-server-box.de:22. Error 111. Connection refused at /home/user/public_html/nextcloud/3rdparty/phpseclib/phpseclib/phpseclib/Net/SSH2.php#101
1 Error while running background job (OCP\Files\StorageNotAvailableException): Storage with mount id 1 is not available
Do you have a sftp-server running yourself that you could run in debug mode? This way you can perhaps catch the error why the connection is refused. It looks like the server refused the connection.
sorry for a stupid question, but is sftp.your-server-box.de really the box to connect to on port 22? or is it just a dummy variable? just checking superficially i could find no dns-record for it.
GOOD LUCK!