We wanted to talk about what this means for SMTP traffic destined to Exchange Online in particular. Also note that Exchange Online will never use TLS 1.0 or 1.1 to send outbound email. This essentially means, soon this deprecation process will be over, and we will no longer accept TLS 1.0 and TLS 1.1 email connections from external sources. The rollout will continue over the following weeks and months. This topic may be super-relevant to you, because as confirmed by the message center post MC229914, TLS 1.0 and TLS 1.1 deprecation started enforcing for Exchange Online mail flow endpoints beginning January 11th, 2021. Head out to our documentation for more details and references if you need a refresher! Also check out this blog entry to see how you can use reporting in Exchange Online to get an overview about the TLS versions used by mails submitted to your tenant.
You can also refer to the IIS log to see the detailed error code to help the troulbehsooting.By now you are hopefully aware of the TLS 1.0/1.1 deprecation efforts that are underway across the industry and Microsoft 365 in particular. Please check if the settings mentioned above are correct.
On different servers, the /Proxy virtual directory must use Integrated Windows authentication. For client communications to be proxied between Exchange ActiveSync virtual directories Note: Proxying isn't possible between virtual directories that use Basic authentication. This virtual directory is located beneath the Exchange ActiveSync virtual directory in IIS and, by default, has Integrated Windows authentication enabled on it. If no ExternalURL value is set, the connection will be proxied to the Client Access server using the FQDN specified by the InternalURL property, specifically to the That contains the ExternalURL value and instructs the client to redirect to that location. If so, CAS-01 issues the client an HTTP error code 451 CAS-01 determines whether any Exchange 2010 Client Access server in that Active Directory site has the ExternalURL property configured on the Exchange ActiveSync virtual directory.
If the user's mailbox is on an Exchange 2010 Mailbox server in a different Active Directory site, CAS-01 locates a Client Access server in the same Active Directory site as the What am I missing? Any help to get ActiveSync working for my remote office users is greatly appreciated.ĭo you configure the proxy or Redirection for the ActiveSync users in other site?
moved a user's mailbox from the remote office server to the home office server and everything works fine.mirrored the IIS settings (Redirect URL, Error page redirect, and SSL requirements) as configured on the home office servers.made the External URL the same URL as what is configured on the home office servers using the cmdlet reference above.Please make sure that the External URL is stamped correctly using the Set-ActiveSyncVirtualDirectory cmdlet. MESSAGE Some Exchange ActiveSync traffic to the External URL is being blocked due to a misconfiguration of the virtual directory RemoteOfficeServer\Microsoft-Server-ActiveSync (Default I notice that I am constantly getting these errors on the server from the main office. For more information, see Additional Details.Ī Web exception occurred because an HTTP 503 - ServiceUnavailable response was received from Unknown. Below is an excerpt of the results page.Īn ActiveSync session is being attempted with the server.Įrrors were encountered while testing the Exchange ActiveSync session.Īttempting to send the OPTIONS command to the server. I ran the ActiveSync Exchange Remote Connectivity Analyzer using a user mailbox that is housed on the remote office server and everything is fine except for the last test. Currently I am migrating users from Exchange 2003 to Exchange 2010 so the overall Exchange environment is in Co-Existence.OWA and Outlook work fine for remote office users but.
OWA, ActiveSync, and Outlook work fine for home office users.1 Exchange 2010 SP2 server acting as CAS/Mailbox server at the remote office.2 Exchange 2010 SP2 servers acting as CAS/Mailbox servers at the Home Office.