When you add an IMS (Infrastructure Management Server) to a data center using the registration URL, the URL is valid only for 30 minutes. If the URL expires, you can regenerate the registration URL and then complete the operation.
To regenerate registration URL for an IMS
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Navigate
Settings (menu bar) > Infrastructure > Details View
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Under the data center, locate the IMS, and do the following:
Select the vertical ellipsis for the IMS > Regenerate Registration URL.
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In the Regenerate Registration URL window, click Submit.