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Unable to Share / render PowerPoint Presentation from externally in Skype for Business Meeting.

Issue: Unable to Share / render PowerPoint Presentation from externally in Skype for Business Meeting.
Error: No specific error message, PowerPoint upload shows loading however it never load.
Problem statement:
First will understand the PowerPoint presentation upload flow:
Flow: The connection is Lync Client > WAC (VIP) > external FW> Reverse Proxy> Office Web Apps Server.
Follow the below steps:
1.     Check event ID: 41032 on Lync front end server. This event will show you Lync Front End is communicating with WAC server. If you are not seeing this event on Lync Front end server then you may have different issue from OWA side. You can refer Configure OWA for Lync Server 2013. In my scenarios seeing correct event ID.

2.     Check if you get event ID: 8118 on Office Web Apps server. If you get this event ID that means your Office Web Apps servers (if more than one OWA servers) are not communicating with each other. In my case OWA servers communicating with each other and no 8118 event on OWA server.

3.     PowerPoint affected only from external hence checking external facing server and component:
a.     External firewall.
b.     External Load Balancer (External VIP).
c.      Reverse Proxy.

4.     By pass external firewall to isolate the issue.
a.     For testing purpose allow all traffic to WAC Virtual IP address without doing Deep Packet Inspection (DPI), Stateful packet inspection (SPI), packet filtering etc.
b.     Sometime firewall will do packet inspection so that’s why isolate firewall is good test. Once stop all filtering test PowerPoint upload from external client. In my case it shows PowerPoint presentation shows loading however never load.

5.     Now by pass HLB and allow traffic directly to Reverse Proxy external interface IP.
a.     All port 443 and 80 port on Reverse proxy server external interface.
b.     Tested PowerPoint upload from external client. In my case it shows loading however never load.

6.     Looks like issue with Reverse Proxy hence installed Fiddler on Reverse proxy server to see web traffic.
a.     Open Fiddler on Reverse Proxy server and reproduce issue:
/m/Presenter.aspx?a and /p/PowerPointFrame.aspx
The responses for the Presenter.aspx request there is a response header in added: X-Frame-Options: SAMEORIGIN

This response header was added to protect site from clickjacking.
Response Header

HTTP/1.1 200 OK


Cache-Control: no-cache, no-store

Pragma: no-cache

Content-Length: 11481

Content-Type: text/html; charset=utf-8

Expires: -1

Vary: Accept-Encoding

Server: Microsoft-IIS/8.5

Cookies / Login


Set-Cookie: DcLcid=ui=1033&data=1033; path=/; secure

Set-Cookie: DcLcid=ui=1033&data=1033; path=/; secure


X-CorrelationId: c31e7d31-140a-4ddf-99af-ebf804357f9e

X-UserSessionId: c31e7d31-140a-4ddf-99af-ebf804357f9e


X-OfficeFE: 8d5e424a472f4e39990d353932dce5b4

X-OfficeVersion: 15.0.4571.1502

X-Content-Type-Options: nosniff


X-AspNet-Version: 4.0.30319

X-Powered-By: ASP.NET

X-Powered-By: ARR/2.5

X-Powered-By: ASP.NET

X-UserSessionId: c31e7d31-140a-4ddf-99af-ebf804357f9e


X-Content-Type-Options: nosniff

X-Frame-Options: SAMEORIGIN

b.     Remove response header added from IIS on Revers Proxy server, Open Internet Information Services (IIS) Manager on IIS ARR server.

c.      In the Connections pane on the left side, expand the Sites folder and select the site.

d.     Double-click the HTTP Response Headers icon in the feature list in the middle.

e.     Highlight “X-Frame-Options” In the Actions pane on the right side, click Remove.

f.       Click OK to save your changes.

7.     Upload PowerPoint Presentation from external client on Lync or Skype for Business client and presentation correctly showing in meeting and rendering happen correctly.

Thank you.


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