When trying to use QuickConnect on ARS 6.5 Server to synchronize one AD attribute between two ARS servers (from 6.7 to 6.5), connection test fails.
The error message is:
Test Failed. The error text: The specified ActiveRoles Administration Service cannot be contacted.
Details: Client cannot use the selected Administration Service due to version incompatibility. Connect to a Service of the appropriate version.
In this case, Quick Connect being used (Sync Engine 4.7 and Base Systems 1.2.1) predates release of ARS 6.7 and was not compatible with its ADSI Provider.
Solution was to install latest QuickConnect (Sync Engine 5.0 and Base Systems 2.0) on the ARS 6.7 and set up synchronization from there. Those versions of QuickConnect's components are compatible with ARS 6.5 and allow for connection to take place.
Other versions of QuickConnect might face same issue. It is recommended that Release Notes for QuickConnect version in use be consulted, confirming supported version of ARS.