Microsoft has released security updates for vulnerabilities found in:
Exchange Server 2013
Exchange Server 2016
Exchange Server 2019
All versions (Cumulative Update levels) are impacted. ...
Updated Aug 05, 2021
Version 15.0
Blog Post
After deploying KB5004778 we have OWA / ECP issue as well (Exchange 2012 CU23)
Microsoft Exchange Server Auth Certificate is valid
AccessRules :
CertificateDomains : {}
HasPrivateKey : True
IsSelfSigned : True
Issuer : CN=Microsoft Exchange Server Auth Certificate
NotAfter : 25.08.2025 15:34:30
NotBefore : 25.08.2020 15:34:30
PublicKeySize : 2048
RootCAType : None
Services : SMTP
Status : Valid
Subject : CN=Microsoft Exchange Server Auth Certificate
https://docs.microsoft.com/en-us/exchange/troubleshoot/administration/cannot-access-owa-or-ecp-if-oauth-expired
What Domain needs to be entered here? -DomainName "contoso.com" internal Domain Name sample.local or external sample.com?
New-ExchangeCertificate -KeySize 2048 -PrivateKeyExportable $true -SubjectName "cn=Microsoft Exchange Server Auth Certificate" -FriendlyName "Microsoft Exchange Server Auth Certificate" -DomainName "contoso.com"
thanks for help