By Martin Brinkmann on May 29, 2017
When you try to connect select Microsoft owned domains such as Hotmail.com or Codeplex.com right now in Firefox, you may get a Secure Connection Failed error.
Sites that are affected by the issue include the following domains: hotmail.com, codeplex.com, visualstudio.com, azurewebsites.net, social.technet.microsoft.com, onedrive.live.com.
In fact, it appears that the majority of Microsoft owned domains are affected by the issue. Only some sites are not.
The error reads:
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