Lync/Skype For Business Front End Server add fails

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Had another very strange issue today when trying to add a third Front End Server to an existing pool. Firstly we were unable to connect to the CMS to download in Step 1 of the Deployment wizard. We manually copied this across from the other front end server after exporting (Export-CSConfiguration -Filename c:\export.zip) and pointing direct at this we get past this step.
However in Step 2 we hit the following error:

Error: An error occurred while applying SQL script for the feature RtcDatabaseStore. For details, see the log file 'C:\Users\rdadministrator\AppData\Local\Temp\Create-RtcDatabaseStore-lync05.domain.ie_rtclocal-[2016_03_30][15_11_57].log' An error occurred while applying SQL script for the feature LyssStore. For details, see the log file 'C:\Users\rdadministrator\AppData\Local\Temp\Create-LyssStore-aughlync05.augh.com_lynclocal-[2016_03_30][15_11_57].log' An error occurred while applying SQL script for the feature LyssStore. For details, see the log file 'C:\Users\rdadministrator\AppData\Local\Temp\Create-LyssStore-lync05.domain.ie_lynclocal-[2016_03_30][15_11_57].log'

So it couldn't create a local copy of the CMS database on the new front end server.
After searching for ever I found that I could simply assign the NETWORK SERVICE account FULL  NTFS rights under the security tab for the CSDATA folder on the new server.

Sorted!

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