m.hotmail.com cannot be verified

What happens when you click the "Details" on the error popup message (See the Pic below)

Changing SSL settings

Settings > Password & Accounts > [Select the Mail account} > [Tape on Account with the email ID} > Advanced > SSL Settings > [Disable]

Click <Account (in Blue)

Click on DONE (in Blue) when exiting in the previous screen

When I click on “details” nothing happens, and it just pops up again, but what’s the SSL setting for? And why is it showing the message all of the sudden?