Access the Content Libraries page from the Menu.
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Find the subscribed content library for wp-content.vmware.com, right click the library, and click edit.
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Then, without making any changes, click OK. After this a red banner log below will appear, click Actions to trust the new cert. It will prompt you to trust the new certificate. Hit Ok to finalize the change.
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After this wait 10-15 minutes for VMOP to automatically pull the now trusted images back to the supervisor cluster.