Thunderbird and "Failed to connect to server mail.comcast.net."

When I open Thunderbird I immediately get a pop up window with this message:

 

"Failed to connect to server mail.comcast.net."

 

However Thunderbird shows a message along the bottom of the window that says:

 

"Connected to server mail.comcast.net".

 

I cannot download new incoming emails, I keep getting the message shown above. But I can send emails via smtp.

 

It was working fine yesterday. The only thing that changed is I applied the August Windows Updates yesterday, but Thunderbird and Comcast email were working fine after that, including after restarts.

 

I am able to get to Comcast email with Firefox on my phone and on my laptop.

 

I am in Baltimore county, MD.

 

Is anyone else having similar issues?

 

Thanks!