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Lync/Skype automatic exclusions

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We are using EFS and Skype for Business 2015 Server.

We have installed EFS on several servers (Server 2016).

it seems that if SQL server components installed on the server and "Microsoft Lync/Skype for Business Server file share"* is enabled, the ekrn.exe tries to connect to the "xds" database on the lync server, and this error message will be recorded in the lync\sql errorlog:

2018-01-10 12:10:05.49 Logon       Login failed for user 'NAME-OF-THE-SERVER-WITH-EFS$"'. Reason: Failed to open the explicitly specified database 'xds'. [CLIENT: IP-OF-THE-SERVER-WITH-EFS]

Is this normal?


edit: * "Automatic exclusions to generate->Microsoft Lync/Skype for Business Server file share"

Edited by ludolf
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EFSW does not filter network communication since it has no firewall. Does temporarily disabling real-time protection make a difference? Ekrn definitely does not connect to any databases.

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Found it:

It makes an ldap query for msRTCSIP-Backendserver in the configuration partition. This stores the sql instance for xds database

Then tries to connect to this sql instance.

xds database contains the information about the Lync topology. Probably ekrn tries to get the path of Lync file share from xds, in order to exclude the path from scanning.



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