Using an existing cloud connector machine:

• Uninstall Cloud Connector from the machine experiencing the issue.
• Remove the machine from the Domain
• Restart the machine
• Rejoin the machine to the Domain
• Restart the machine
• Install Cloud Connector

When bringing up a new cloud connector machine:

• Make sure the machine is joined to the domain
• Install Cloud Connector

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Problem Cause

The problem was that one of the two connector machines had lost its trust relationship with Active Directory, causing the calls from the ADAgent to fail.

Reason behind occurrence: 

• Searching Sumo Login for the Customer Name + ADAgent resulted in a large number of ERROR events. All errors were originating from a single cloud connector machine.
• The detailed error information showed that the Domain Authentication for the machine was failing due to the username and/or password being incorrect.

XenMobile Debug Logs :
TimeStamp=2017-02-09T19:45:22.3686060Z EdgeServerId=62cc9d0f-14ef-4646-a41a-7e104ea5c6e7 MachineName=<connector machine FQDN> MachineIP=<connector machine IP address> ResourceZone=Default CustomerId=<Customer ID>  EventId=4 Level=Error EventName=ErrorInfo ProcessId=3944 ThreadId=956 ProviderId=bdaa8c62-2974-5487-8c89-70057b1d9384 TransactionId=83a5c8c5-3002-421f-8292-4cc697a59da4 RoleName=AdAgent Message=Agent: ID: TryHandle Exception caught: Citrix.CloudServices.ActiveDirectory.DomainAuthenticationException:
The user name or password is incorrect.
 ---> System.DirectoryServices.DirectoryServicesCOMException: The user name or password is incorrect.
   at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
   at System.DirectoryServices.DirectoryEntry.Bind()
   at System.DirectoryServices.DirectoryEntry.get_NativeObject()
   at Citrix.CloudServices.ActiveDirectory.ActiveDirectoryExtensions.ForceBind
(DirectoryEntry de)
--- End of inner exception stack trace ---