The testing server URL was working fine.. I decided to do a complete re-boot of all components.. I was running DWCC ( 2015 ) because I was having problems with loading plugins on the the then current version 2018. So I uninstalled DW an updated to the latest version re-installed my plugins ( Databridge, eCart and DMX server behaviours and data bindings panel support ) which incidentally all loaded with no problem.. I then re-installed MAMP Pro. ALL seems fine now.