Sign in with PIN or smartcard. OWA or ECP stops working after you install a security update. 4/12/2021; 2 minutes to read; b; v; C; Applies to: Exchange Server 2019, Exchange Server 2016, Exchange Server 2013, Exchange Server 2010 Service Pack 3.
Original KB number: 4469384
Users can't connect to OWA or ECP. The browser generates an error message that states that the session can't be secured due to inadequate security settings.
This is a known issue with Exchange 2019 RTM. The cryptography cipher suites that are configured by Exchange setup are incorrect and don't include HTTP/2 support on all supported browsers.
Run the following PowerShell commands on each server after Exchange Server is installed. Sound of the sea emerald isle.
Microsoft Owa Dod
This issue is expected to be resolved in Exchange Server 2019 Cumulative Update 1. New servers that are deployed with Cumulative Update 1 will not experience this issue. Customers who deploy a server by using the RTM version of Exchange Server 2019 or who upgrade an RTM-based server to Cumulative Update 1 (or a later version) will need to apply the workaround to each Exchange Server.