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The warning message is most likely due to the fact that Visual Studio 2005 sometimes adds LINK tag(s) inside the HEAD tag that point(s) to the editor css skin file(s), e.g.:
<link href="C:\Dev\WebProject\RadControls\Editor\Skins\Default\Controls.css" rel="stylesheet" type="text/css" />
As you can see the href attribute of the LINK tag points to your the server's local drive which path under SSL environment is a forbidden destination.
Since RadEditor does not need this LINK tag as it is able to locate its controls.css file itself, you should manually delete the LINK tag.