![]() We followed this for guidance: įortunately, in our case Windows and Exchange were already well patched so we only needed to add these registry keys and DWORD items on the server and reboot it. This is great solution because only the server needed to be touched and we did not have to touch the workstations. This works because Windows 11 supports TLS 1.2 by default at this time and Windows 2008 R2 can be made to support TLS 1.2. That is all of the workstations connected to the same subnet as the server never had a problem after the Windows 11 upgrade, but all of the workstations outside of that subnet failed with proxy (Error Code 80000000). Youll need an on-premises administrator account that has read access to your users mailboxes. ![]() All on-premises mailboxes will be moved to Microsoft 365. In our case, this happened when the Windows 10 workstations were upgraded to Windows 11 and is only noticed on workstations connected outside of the subnet the server is connected to. Microsoft 365 will need to connect to your Exchange 2010 servers by using Outlook Anywhere over TCP port 443. Therefore, Outlook can't communicate with Exchange. Our failed configuration was: Outlook 2013 running on Windows 11 not connecting to Exchange 2010 running on Windows 2008 R2 via proxy.Ĭause of failure: Windows 11 disables TLS 1.0 and TLS 1.1 by default and Exchange 2010 running on Windows 2008 R2 uses TLS 1.0.
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