Once installing Exchange 2016 Cu8 on Windows Server 2012 R2 gave error on OWA.
ECP will work if administrator doesn’t have a mailbox. else even ecp will throw the same error.
An unexpected error occurred and your request couldn’t be handled.
Search for Event 2004 to make sure you are having issues with the auth certificate-
Log Name: Application
Source: MSExchange OAuth
Event ID: 2004
Task Category: Configuration
Unable to find the certificate with thumbprint A9BBA1727F285CD86EB5785DF47C0A19DA997280 in the current computer or the certificate is missing private key. The certificate is needed to sign the outgoing token.
- Creating a new Exch Auth Certificate. Resolved the issue.
Ran below , Saw Auth certificate missing.
New-ExchangeCertificate -KeySize 2048 -PrivateKeyExportable $true -SubjectName "cn=Microsoft Exchange Server Auth Certificate" -FriendlyName "Microsoft Exchange Server Auth Certificate" -DomainName "careexchange.in"
Say no to Replace SMTP Certificate.
verified auth certificate created successfully. Do iis reset. wait for few hours if its a large environment. it should resolve the same.
Run below if still issue persists.
- Locate bin folder and run updatecas.ps1 and updateConfigfile.ps1 resolved for few others.
Other things i have tried –
- Took Backup – Tried Removing msExchCanaryData0/1/2. No luck
- Uninstall and re install the server. No Luck