Connector is failing to pull updated items from Rally to the 3rd party system. In the log file, there is an error similar to the following:
[2018-05-10 11:11:19 Z] ERROR : RallyEIF::WRK::QCConnection.find_internal - Found more than one - req with id 206866319812 [2018-05-10 11:11:19 Z] WARN : RallyEIF::WRK::Connector.update_other - Quality Center req 860777 matched to Rally userstory US5688222 has mismatched external identifier in Rally item
The original "ExternalID" value for the updated artifact was removed in Rally.