chris21 Import All fails with "Access has been denied"

When the Identity Broker is accessed, all the Connectors are currently Red and the errors in the log are as follows:

Change detection engine import all items failed.
Change detection engine import all items for connector Chris21 POS failed with reason Line type is recognized but not valid Command. Line: GTR:cbr="logon",logonapplication="breoption",user="REDACTED",password="REDACTED",credentialsrequired="Y",error01="BRE029:Unable to access interface. Contact your Security Officer.",error02="BRE103:Access has been denied.",status="fail". Duration: 00:00:01.4218568
Error details:
System.IO.InvalidDataException: Line type is recognized but not valid Command. Line: GTR:cbr="logon",logonapplication="breoption",user="REDACTED",password="REDACTED",credentialsrequired="Y",error01="BRE029:Unable to access interface. Contact your Security Officer.",error02="BRE103:Access has been denied.",status="fail"
at Unify.Product.IdentityBroker.Chris21Agent.CheckLoginResult(IChris21Record loginResultRecord, Action`1 pre)
at Unify.Product.IdentityBroker.Chris21Agent.GetLoginToken(IChris21ConnectorInformation connectorRequest)
at Unify.Product.IdentityBroker.Chris21Agent.List(IEnumerable`1 keyColumnNames, IChris21ConnectorInformation connectorRequest)
at Unify.Product.IdentityBroker.Chris21ConnectorBase.GetAllEntities(IStoredValueCollection storedValueState)
at Unify.Product.IdentityBroker.ConnectorToReadingConnectorBridge.GetAllEntities(IStoredValueCollection storedValueState)
at Unify.Product.IdentityBroker.EventNotifierReadingConnectorDecoratorBase`1.GetAllEntities(IStoredValueCollection storedValues)
at Unify.Product.IdentityBroker.ChangeDetectionImportAllJob.ImportAllChangeProcess()
at Unify.Product.IdentityBroker.ChangeDetectionImportAllJob.RunBase()
at Unify.Framework.DefinedScopeJobAuditTrailJobDecorator.Run()
at Unify.Product.IdentityBroker.ConnectorJobExecutor.<>c_DisplayClass29.<Run>b_27()
at Unify.Framework.AsynchronousJobExecutor.PerformJobCallback(Object state)

Looks like a permissions issue at this point with the BRE, but we need to know where we should be looking.