your server does not support the connection encryption type you have specified.

Thanks for reaching out, user_s0t860. While we cannot troubleshoot Outlook as that is not our product, we can assist with ensuring that you can get logged into your Xfinity account and that you have access to your comcast.net email via the Xfinity Connect website. Please remember that using third-party email clients (e.g., Outlook, Apple Mail, Thunderbird, etc.) to access your Comcast.net email address can potentially expose your Xfinity ID and password to fraud and other risks. We recommend you access your Comcast email by going to Xfinity Connect and clicking Email. We do have some helpful information that should help you reconfigure your comcast.net email in Outlook which may help. It can be found here. I hope this info helps!