Thawte SSL Certificate not trusted after installation on Microsoft IIS

Solution ID:    SO15171    Updated:    06/10/2016


Any certificate requires the intermediate certificate to be installed.


Your error indicates the intermediate certificate has not been installed or incorrectly installed.


Step 1: Download the Intermediate Certificate

Select the correct Intermediate Certificate for your certificate type: INFO1384


Step 2: Create a Certificate Snap-in in the Microsoft Management Console (MMC) to manage your certificates:

Complete the steps for your IIS version: SO1849
Step 3: Install the intermediate certificate:
  1. Open the Microsoft Management Console (MMC)
  2. Click on Certificates from the left pane
  3. Double-click on Intermediate Certification Authorities from the right pane
  4. Right-click on Certificates subfolder from the right pane and select All Tasks > Import to open the Certificate Import Wizard
  5. Click on the Next button
  6. Specify the location of the intermediate file by browsing to it and click on the Next button
  7. By default, it will place the certificate in the Intermediate Certification Authorities store. Keep this selection and click on the Next button.
  8. Click on the Finish button
  9. A message will appear confirming the successful import of the certificate. Click on the OK button.


Note: If your site still has the chaining error, restart the IIS service. If the problem continues, the whole server needs a reboot to use the new intermediate.

Also, open and close any browser you had open before doing the above that was giving you the chaining error, to prevent any browswer caching issues from showing the incomplete chain.


Thawte has made efforts to ensure the accuracy and completeness of the information in this document. However, Thawte makes no warranties of any kind (whether express, implied or statutory) with respect to the information contained herein. Thawte assumes no liability to any party for any loss or damage (whether direct or indirect) caused by any errors, omissions, or statements of any kind contained in this document. Further, Thawte assumes no liability arising from the application or use of the product or service described herein and specifically disclaims any representation that the products or services described herein do not infringe upon any existing or future intellectual property rights. Nothing herein grants the reader any license to make, use, or sell equipment or products constructed in accordance with this document. Finally, all rights and privileges related to any intellectual property right described herein are vested in the patent, trademark, or service mark owner, and no other person may exercise such rights without express permission, authority, or license secured from the patent, trademark, or service mark owner. Thawte reserves the right to make changes to any information herein without further notice.  

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