Free/Busy between different Sites in same Organisation not working – Exchange 2010

Symptoms:

Free busy not visible.
TestOutlookwebservices – Targetaddress : “address of user in affected site”
RunspaceId : 74664850-7f80-4552-9449-7df1c2171d1a
Id         : 1111
Type       : Error
Message    : Bei der Abfrage der Verfügbarkeit für die Empfänger-E-Mail-Adresse “emailaddress” wird der folgende Fehlercode und die folgende Fehlermeldung empfangen: ErrorServiceDiscoveryFailed:Unable to find a Client Access server that can serve a request for an intraforest mailbox <“E-mail address”>

Cause :
InternalNLBBypassUrl of webservicesVirtualDirectory is empty

Solution :
Set-webservicesVirtualDirectory –Identity Servername\EWS (Default Web Site) –InternalNLBBypassUrl <add here the internal or external url>

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