Hello Mark,
Thank you for your message.
Could you please clarify if you have enabled at least one
authorization method on the remote Host and set the password for this method? If no authorization method is enabled, you will not be able to connect to this Host as there are no technical, blank or default passwords for security reasons. Here's a relatable Documentation article that might be helpful:
https://www.remoteutilities.com/support/docs/security/Please let me know if there is any authorization method enabled and the password is set but the issue still persists.
Looking forward to your reply.