Issue: Cannot log into Excel Add-in because of an invalid security certificate

If the System Management Server (SMS) configured in the Excel Add-in and the Historian Server node are different, you will get the error that the content is blocked because it isn't signed by a valid security certificate.

To solve this issue, you must configure the same SMS for both the Excel Add-in and the Historian Server node. See the Configure a System Management Server section of the System Platform Installation guide for detailed instructions.