Your browser is looking for a DoD root certificate, which provides the identity of a web site or a person. The DoD recommends that you install several certificates.
To download and install the certificates, follow these steps:
1.Open Internet Explorer.
2.Click the following link: Download Class 3 Root CA Certificate. The File Download window opens.
3.Click Open. (If you receive a security warning, click Allow.) The Certificate Manager window opens.
4.In the left side of the Certificate Manager window, click the plus sign (+) to see the Certificates folder.
5.Double-click the Certificates folder. The available certificates show on the right.
6.Locate the certificate that you downloaded (for example, DoD Class 3 Root A), then double-click the certificate. The Certificate window opens.
7.Click Install Certificate. The Certificate Import Wizard window opens.
9.Select the Place all certificates in the following store option, then click Browse. The Select Certificate Store window opens.
10.Select the Trusted Root Certification Authorities folder, then click OK.
12.Click Finish. If a Security Warning message appears, click Yes, then click OK to close the confirmation message.
13.Click OK to close the Certificate window.
14.Repeat steps 2 through 13 for the following certificates: