Another issue it could have been if the certificate had expired/renewed and the send connector had not been updated. I resolved the issue by installing the wildcard certificate on the CAS boxes and re-running then Hybrid configuration wizard, but I could of also installed the certificate on the edge servers.
They were using an cert for their CAS server/URL's but had a *. certificate on their Edge server's. I found the problem was due to the configuration of the TLS certificate. An " 454 4.7.5 certificate validation failure " was logged on the server.
Recently working for a client as part of an Exchange 2013 Hybrid deployment with centralised mail transport they were not receiving email at EOL from their on-prem environment. In the following commands the mailbox locations are important Office 365 mailbox - On-Premise Mailbox - devpetersenit.ltd Other articles that may help are Troubleshooting free/busy issues in Exchange hybrid environment - Testing Autodiscover - se-the-attendee-s-m From On-Premise Test-OAuthConnectivity -Service EWS -TargetUri Office 365 - 454 4.7.5 certificate validation failure I have listed a working known good reference deployment so you can compare this against your deployment when troubleshooting free/busy sharing for example. When running dsregcmd /status we could see the AzureAdJoined had a value of No so Exit code: Unknown HResult Error code: 0x801c0021.
Exit code: Unknown HResult Error code: 0x801c0021.Īutomatic registration failed at join phase. The server returned HTTP status: 0.įailed to discover the Azure AD DRS service. The discovery operation callback failed with exit code: Unknown HResult Error code: 0x80072efd. Error: Unknown Win32 Error code: 0x80072efd WINHTTP_STATUS_CALLBACK status code: 2097152. Once again we c hecked the event log for clues, Services / Microsoft /Windows / User Device Registration / Admin and found the following: Microsoft-Windows-User Device Registration/AdminĮxample of Hybrid Join Proxy Issues Another error I have found is when devices cannot register as Hybrid Join Devices with Azure AD due to proxy issues.
The complete join response operation was successful. Source: Microsoft-Windows-User Device Registration Log Name: Microsoft-Windows-User Device Registration/Admin
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