This network employs a technology called captive portal which allows the administrator(s) to restrict network access to trusted users. In order to prevent certificate security warnings when accessing this portal, the network's filtering unit must issue to your computer or mobile device a file called an SSL certificate.
This guide will help you install the SSL filtering certificate as a trusted root CA on a Windows / Active Directory Group Policy Object (GPO). Certificates installed via Group Policy will be respected by all browsers which use the operating system's built-in certificate store — this includes Internet Explorer, Chrome, and Safari.
First, click the Download Certificate button below; this will begin a download of the file to your computer.
Depending on your browser and configuration, you will probably be asked whether you would like to open the file or save it; choose Save, and, if prompted, save the file to an easily accessible location (such as the Desktop).
(Note: These image show Internet Explorer 8 and Windows Server 2003; you may not see exactly the same thing if you are using another browser or a different version of Windows; however, the general process and wording should be the same.)
Using an account with sufficient administrative permissions, launch the Group Policy Management utility. This can usually be found under Administrative Tools in either the Start menu or the Control Panel.
Highlight the Group Policy Object you'd like to modify — if you aren't sure which one it is, please contact your network administrator or directory vendor — and right-click it. Then, select Edit.
The Group Policy Object Editor will open next. In the left-hand column, expand (double-click) the list items as follows: Computer Configuration > Windows Settings > Security Settings > Public Key Policies > Trusted Root Certification Authorities.
Right-click on Trusted Root Certification Authorities and select Import.
The Certificate Import Wizard will open; click Next.
You will be asked to specify the certificate file to import; click the Browse button to the right.
An Open dialogue will appear, allowing you to select a file. Locate the certificate file you saved earlier, highlight it, and click Open.
The File to Import screen should now show the certificate file name; click Next.
You will be prompted for a certificate store. The correct option — to place the certificate in the Trusted Root Certification Authorities store — should already be selected; click Next.
At the Completing the Certificate Import Wizard screen, press the Finish button.
A confirmation will appear, indicating that the certificate import was successful. Press OK.
You're done! You may close any remaining certificate windows and continue working as usual; the certificates will be installed to each applicable work station upon their next log-in. In most cases, you (and your users) will not notice anything different after the certificate is installed.