This network employs a technology called SSL filtering which allows your network's administrators to filter out harmful or inappropriate Web content such as viruses and pornography. In order for this technology to work effectively, 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 for the Opera browser.
First, click the Download Certificate button; this will download the certificate file to a temporary location on your computer. Visit your domain's portal page to download a certificate. By default, this is https://portal.cipafilter.com.
Next, a dialogue will appear, asking if you would like to install the certificate authority. Click Install.
(Note: These images show Opera on Mac OS X. If your computer runs Windows or Linux, the buttons may look different — but the words should be the same.)
After clicking Install, another dialogue will appear, asking if you are sure you want to trust this issuer. Click OK here.
You're done! You may continue browsing as usual; in most cases, you will not notice anything different after the certificate is installed.