The connection test to WordPress fails with a message ‘Unknown error’
Question
What if the connection test to WordPress fails with a message ‘Unknown error’
Answer
One of the causes might be that a plugin that controls or influences access to API’s or user access rights is active. An example is “Jetpack – WP Security, Backup, Speed, & Growth”.
SuperOffice for Wordpress needs explicit access to the user API.
Contact your WordPress administrator or the developer of the plugin for help in configuring the plugin.