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Skype for Business, Lync and Exchange Web Services (EWS) and different DNS Domains- Exchange crawling e.g. for presence

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Hi all,
(This is an updated version 2.2: 09.07.2015)

This blog entry is valid for Lync 2010, Lync 2013 and Skype for Business Server.
Generally, I'll write a new blog article, since the conversion history over multiple device and other service have change with Skype for Business 2015 Server. Once this written, I post the link here.

there is always confusion in how Lync is crawling Exchange Web Services (EWS).
Generally it is necessary to understand how DNS must be implemented:
Just remember, identify if you have DNS Split configuration, different internal and external DNS names and what are your SMTP and SIP Domains.


Very often you find in Lync/ Exchange deployments an issue, where the Lync configuration show up with empty:
EWS Internal URL
EWS External URL
and
EWS Information = EWS not deployed

Therefor Exchange Web Service are not connected deployed and several Lync Integration Features are not working, e.g. Presence Information based on your Outlook Calendar.
The feature depending on EWS ar…
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Lync 2013 Client, Desktop Sharing shows blank screen (Windows 7, Windows 8, Windows 8.1)

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I came across this problem, where a customer reported:
A user could not participate on desktop sharing session, neither in conference nor in a p2p session. Other video related submission were working, like video or white board.
First I was guessing it could have been the video driver, but if video in Lync was working it didn't sound quite logic.

After investigating this problem, I saw a ActiveX blocking Error Message in the Eventviewer:

Microsoft Lync
CLSID: {00000000-0000-0000-0000-000000000000}
CATID: {9B179D6E-9BDB-454b-BE3D-89F9A792BD39}
The ActiveX Compatibility setting disabled loading this object to help protect your security.
15.0.4433.1506
0x80004005

This let me investigate more closer into Internet Explore. Well even there is couldn't see anything directly:

Microsoft reports several TechNet article:
http://support.microsoft.com/kb/240797/en-us
http://support.microsoft.com/kb/909738/en-us

So you need to change the ActiveX Control Settings for Lync 2013 Client:

SOLUTION:Go and d…
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File Share Perfomance for Skype for Business (slow conference join, slow address book)

Once more first.
Really make always sure your environment is patched and up to date.

Mainly if you have a slow Join Conference user experience. Validate your DFS or File Server.


Just what we experienced during certain Skype for Business Updated, as well as support cases is:
- Migration is slow
- Join Conferencing experience is slow
- Address Book generation is slow
and more


This is, if the Fileshare is not fast enough. What does this mean:
You should ensure the IOPS as well as the network throughput is sufficient and not the bottleneck in your environment.
Do a measurement on the file servers, see what is happen if DFS replication is kicked in, check if this is share file server, whats happen if other app's access the shares and monitor the IOPS/ bandwidth.
Just this is not all, also just perfmon for CPU load, and Memory especially paging.

If you experience slow conference joins, it will be the issues, mostly.
(Sure the local SQL server also consumes performance on the Skype for Business Fron…
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