If you typed the page address in the Address bar, make sure that
it is spelled correctly.
Press this button:
If your Network Administrator has enabled it, Microsoft Windows
can examine your network and automatically discover network connection settings.
If you would like Windows to try and discover them,
click Detect Network Settings
If you are trying to reach a secure site, make sure your Security settings can support it. Click the Tools menu, and then click Internet Options. On the Advanced tab, scroll to the Security section and check settings for SSL 2.0, SSL 3.0, TLS 1.0, PCT 1.0.