Bug #60886
closedBackend via https throws "SEC7111: HTTPS security is compromised by res://ieframe.dll/dnserrordiagoff.htm" in IE
100%
Description
Our beloved InternetExplorer has a problem with javascript:false as Ext.SSL_SECURE_URL.
When you open the backend, than there is a hidden iFrame (typo3-navigationIframe) with an empty src attribute and the IE uses javascript:false as src (default for Ext.SSL_SECURE_URL [1]).
When you open the backend via https, the IE wants to show res://ieframe.dll/dnserrordiagoff.htm because javascript:false is not a valid url. But this is detected as an unsecure resource. So you see this warning in the developer tools: "SEC7111: HTTPS security is compromised by res://ieframe.dll/dnserrordiagoff.htm"
Setting the URL to the clear.gif as Ext.SSL_SECURE_URL in typo3/sysext/core/Classes/Page/PageRenderer.php helps and doesn't create too much unnecessary traffic.
[1] http://dev.sencha.com/playpen/docs/output/Ext.html#SSL_SECURE_URL