Microsoft Outlook 2013/2016 clients on PC did not exhibit any issues. Latest Microsoft Outlook for Mac did not exhibit any issues either! It is worth pointing out that while Outlook 2013/2016 on PC use MAPI/HTTP or RPC/HTTP to connect to Exchange 2013/2016 servers, both clients on Mac (Mac‘s own Mail client and Microsoft Outlook for Mac) use EWS to connect. Mac Mail would show “Account Error” which read “Unable to connect The server returned error: Connections to host mail.contoso.com on default ports failed.” The error is somewhat misleading as when you look at EWS logs on Exchange server, you see that the server rejected the request with HTTP error 400 which translated to “bad request”. What I didn’t know at that point is which element in the HTTP request was causing the server to reject the request. Microsoft provides great testing tools for Exchange on, so I decided to run EWS connectivity test from the toolset. To my surprise, the test failed with the error “Message: The request failed.
From Outlook's main window, click on the File button (top left), and select Options.Go to 'Mail' settings on the left, and click on the Signatures button.You can also access that screen from the email editor (see screenshot). Note: I took this tutorial's screenshots in Outlook 2016, but the steps are the same in Outlook 2013 and Outlook 2010 (even Outlook 2007, to an extent). Settings include options for changing port numbers, using SSL, downloading message headers, and setting server addresses. To access these settings, click Outlook > Preferences > Accounts, select the Exchange account, and then click Advanced.
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The remote server returned an error: (501) Not Implemented.” I knew about this particular error as I had worked with Michael Van Horenbeeck and is documented here. The issue is also documented by Brian Reid: and Phil Sharp:. After enabling L7 debug tracing on my KEMP LoadMaster I observed the same error mentioned in the above articles “lb100 kernel: L7: badrequest-clientread 157.56.138.142:51830-66.252.99.125:443 (-501).
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