Why isn't Active Sync connecting to the server after 6.0.1 upgrade?

[AC Question]

I just received Android 6.0.1 update on my Note 4. I use Active Sync for my corp email. I changed my email password, and now I get 'Unable to connect to Server' error message. I change my PW on my Tab 4 and everything is working fine. Is there a new setting/ feature in 6.0.1 I need to adjust to correct the issue?
I have checked Security settings, app defaults, done additional PW change on my email account in case the PW was not working for some reason.

 

[B. Diddy]

Moved to the Note 4 forum.

 

[Evcass69]

Moved to the Note 4 forum.

I noticed the same thing this morning. New messages are sync'ing to my Inbox, but not sent messages. I have 3 different AS connections to 3 different servers including outlook.com; they all say cannot connect to server when I attempt to manually connect.