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 for Apple mobile devices, including the iPad, iPhone, and iPod touch.
First, click the Download Certificate button below; this will download the certificate file to a temporary location on your device.
A screen will appear called Install Profile. It will indicate that the profile (certificate) is Not Verified; to verify it, tap the Install button.
(Note: These images show iOS 10 running on an iPhone SE; if you have an iPad, or a different version of iOS, the layout and buttons may be different — but the general wording should be the same.)
If you have a passcode set, you may be required to enter it. If you don't have one set, you may be prompted to create one, depending on your device configuration.
Next, you will be presented with a warning about the unverified authenticity of the profile. Read over this if you like, then tap Install. You may be prompted to confirm; if so, tap Install once more.
You will see a confirmation that the profile has been installed, and that the certificate is now Verified. If you like, you may tap the Done button in the top-right corner.
On newer versions of iOS (10.3+), one final step is required:
Press the round Home button at the bottom of the device, then tap the Settings icon on the Home screen. In the Settings app, click General, then About. Scroll to the bottom of the screen and tap Certificate Trust Settings.
On the Certificate Trust Settings screen, tap the switch next to the certificate you installed to trust it. If prompted to confirm, tap Continue.
You're done! You may close or switch away from the Settings app and continue browsing as usual; in most cases, you will not notice anything different after the certificate is installed.