Failed to register the connector: Microsoft.EnterpriseManagement.Common.ConnectorAlreadyExistsException: A connector with that connector id or name already exists.

Document ID : KB000049342
Last Modified Date : 14/02/2018
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Description:

The above error may be seen when trying to run Spectrum / System Center Operations Manager (SCOM) integration after moving the SpectroSERVER to a new host.

Solution:

When seeing the above error message trying to rerun the Spectrum / SCOM integration after moving the SpectroSERVER to new hardware, it is necessary to remove the old product connector from SCOM manually. There is no Delete option in the admin console UI for product connectors.

In order to manually remove the old product connectors the following Microsoft technical document details how to do so:
http://support.microsoft.com/kb/2626670

After carrying out these steps you should then be able to rerun the Spectrum / SCOM integration successfully.