Another thing to check is verify the user logon credentials are correct. Be sure that username is the same as what is in the database. Example if the username has a capital letter, "JSmith" make sure that its exactly the same.
You also may need to go into PG Explorer and enable Agent Reporting and adding the site name under the advanced tab.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.