vCenter: IE Content was Blocked “Not Signed by a Valid Certificate”

KB ID 0001500


While attempting to manage vSphere Center with Internet Explorer. Access is blocked as it was not signed by valid security certificate.

vSphere - content was blocked not signed by a valid certificate

Content was blocked because it was not signed by a valid security certificate

For more information see “About Certificate Errors” in Internet Explorer Help.


The client simply does not trust the certificate VMware is presenting, (it’s a self signed certificate). So we just need to trust the CA that issued it! Open you browser and navigate to the hostname/IP of the vCenter. From there choose “Download trusted root CA certificates“.

vCenter Download Root CA Certificate

Your machine should download the certificates in a Zip file. Open and extract that file. Locate the security certificate and double click it > Install Certificate.

Install vCenter Root CA Certificate

Next > Select “Place certificate in the following store” > Locate the “Trusted Root Certification Authorities” container, and select that > Next > Finish.

Import vCenter Root CA Certificate

When prompted select “Yes” > OK.

Successful Import vCenter Root CA Certificate

Try again.

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Author: PeteLong

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