I’ve done some additional testing and can confirm that the issue does not appear to be related to CloudMounter.
I tested the SFTP connection directly from the terminal, completely bypassing CloudMounter.
The SFTP server responds normally and asks for the password, but after entering the correct password it returns:
Permission denied, please try again.
This confirms that the authentication is being rejected directly by the SFTP server.
Additionally, I have an Amazon S3 drive mounted through the same CloudMounter installation, and it is working normally.
The issue started today and affects my Cloudron SFTP connections, which were working normally before.
So at this point, the issue seems to be related specifically to SFTP authentication rather than CloudMounter.
