Sometimes I got this error in SharePoint 2013. For example when I try to create a new item in some list. Or when I try to add a new column to some list in the list settings page. I got this error only when I am not on the production environment. So If I am home for example.
This is the error:
The page cannot be displayed
Explanation: There is a problem with the page you are trying to reach and it cannot be displayed.
Try the following:
Refresh page: Search for the page again by clicking the Refresh button. The timeout may have occurred due to Internet congestion. Check spelling: Check that you typed the Web page address correctly. The address may have been mistyped. Access from a link: If there is a link to the page you are looking for, try accessing the page from that link.
Technical Information (for support personnel)
Error Code: 500 Internal Server Error. The request was rejected by the HTTP filter. Contact the server administrator. (12217)