I thought that this was a Windows 8.1 bug but it is an Internet Explorer 11 bug, the fact that I discovered after installing the developer preview of IE11 on Windows 7. To be absolutely clear, the problem is there on both Windows 8.1 and on Windows 7 with
IE 11 installed.
My connection is PAP authenticated PPPoE dialup (over WiFi and ADSL), and the connection cannot be set as a default connection, the Internet options UI simply doesn't register and doesn't save the setting and it always looks like this:
As no default connection is apparently set, none is automatically dialed on startup and one has to manually initiate the connection. Moreover, the first attempt seems to failevery time with a 651 modem error. The second attempt succeeds.
To repeat: this is a bug both on the current Windows 8.1 Preview AND on IE 11 Preview for Windows 7.