Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.


Users can’t use Outlook on the web (OWA), Exchange Control Panel (ECP), or the Exchange admin center (EAC) for a long time after an authentication certificate is published for servers that are set to the UTC time zone or any UTC+<#> time zone.

The new authentication certificate remains invalid for the specific UTC+ hours that are configured on the server. For example, If server time zone is UTC+8, the certificate remains invalid for 8 hours.


To fix this issue, install the following updates, as appropriate:

Cumulative Update 12 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019

Cumulative Update 23 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!