ERROR : There was a connection problem

Hi Support,

I have a problem on this plugin.

I have 2 wordpress site which is ‘’ and ‘’ (cannot reach because I changed local host table), ‘’ as master.

I am following the documentation guide pass Master site url and key to sub-site, unfortunately I got a message “There was a connection problem. Please check the URL and Key of the Master site” after synchronization.

I already enable “Debug mode” but still cannot see any log from plugin file.