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Exchange 2016 CU19 OWA Logoff with WAF and Reverse Auth

Hi Sophos Community

We have some Customers using Sophos UTM with WAF to secure Exchange OWA. As the logoff does not work out of the Box (only "please close all browser now") we have implemented a workaround described here: https://social.technet.microsoft.com/Forums/en-US/71462d67-f05b-4d74-af63-b22f3dea35d7/exchange-2016-logoff-does-not-generate-logoff-request?forum=Exch2016GD

This has worked perfectly until updating Windows or Exchange a few days ago. I don't know if it was CU19 or just a Windows Update (maybe for CU19). There is always the Popup with "please close all browsers now" but no redirect to /owa/logoff.owa anymore. The Javascript file is in place with the modification from the Technet above, but seems not to work anymore.

Has anyone else the same problem and found a solution for this?

Regards,

Michael

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