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Can't access EWS from Outlook/OWA add-ins via makeEwsRequestAsync in Exchange Server 2016 and Exchange Server 2013

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Symptoms

Assume that accessing external Exchange Web Services (EWS) URL is blocked from internal Exchange servers in a Microsoft Exchange Server 2016 or Exchange Server 2013 environment. In this situation, the client applications that are posting ExecuteEwsProxy calls will be failed to connect, such as Salesforce add-in for Outlook and Outlook Web App (OWA).

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Cause

This issue occurs because the ExecuteEwsProxy function is only using external EWS URL. This causes the makeEwsRequestAsync method fail to call EWS.

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Resolution

For Exchange Server 2016, install Cumulative Update 8 or a later cumulative update for Exchange Server 2016.

For Exchange Server 2013, install Cumulative Update 19 or a later cumulative update for Exchange Server 2013.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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References

Learn about the terminology that Microsoft uses to describe software updates.

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Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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Keywords: kbsurveynew, kbexpertiseadvanced, atdownload, Can't access EWS from Outlook/OWA add-ins, Can't use Exchange Web Services from Outlook/OWA add-ins, client applications that are posting ExecuteEwsProxy calls will be failed to connect, the makeEwsRequestAsync method fail to call EWS, kb

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Article Info
Article ID : 4056329
Revision : 16
Created on : 7/30/2020
Published on : 7/30/2020
Exists online : False
Views : 163