If you are working in IIS setting up or making changes for MCe, you may get the "No default SSL site has been created. To support browsers without SNI capabilities, it is recommended to create a default SSL site.

You can safely ignore this very old warning. Last reported to us in the wild in 2026.03 If you are seeing this more than a year after - let us know so we can update our docs to state that yes, IIS is still showing this old warning."

That is a warning for browsers that are not compatible with SNI.  But those browsers are also incompatible with basically everything too, including MC.

• IE on XP
• Android 2.x
• Safari on XP
• Blackberry browser, Windows Mobile 6.5 and below
• Java version 6, Python 2
• Effectively apps and tools released before ~2010 and not upgraded since.