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InstantSSL Certificate Installation: Microsoft IIS Root and Intermediate Certificate installation
Installing the Root & Intermediate Certificates
Save these Certificates to the desktop of the webserver machine, then:
Click the Start Button, select Run, type mmc and select OK
Click File and select Add/Remove Snap in
Select Add
Select Certificates from the Add Standalone Snap-in box and click Add
Select Computer Account (NOTE: This step is very important. It must be the computer account and no other account) and click Next
Select Local Computer and select Finish
Close the Add Standalone Snap-in box, click OK in the Add/Remove Snap in
Return to the MMC
To install the your Root Certificate:
Right click the Trusted Root Certification Authorities, select All Tasks, then select Import.
Click Next.
Locate the Root Certificate and click Next.
When the wizard is completed, click Finish.
To install the Intermediate Certificate/Certificates:
Right click the Intermediate Certification Authorities, select All Tasks, select Import.
Complete the import wizard again, but this time locating the intermediate Certificate when prompted for the Certificate file.
(note you will need to repeat this step for all the intermediate certificates that are sent to you.)
Ensure that the Root certificate appears under Trusted Root Certification Authorities
Ensure that the intermediate certificate / certificates appears under Intermediate Certification Authorities
Once these are installed you may need to restart the server.
