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I noticed a strange behavior when searching from IE and using the QueryEX/Query functions or the webservice.

I always get System.ServiceModel.CommunicationException when I use the webservice to search. But When I try the same search from website, I get valid results. Then if I go back and try the same search again using the webservice, I get valid results.

Nothing fancy here..

<QueryPacket xmlns="urn:Microsoft.Search.Query" Revision="1000">
    <Query domain="QDomain">
            <QueryText language="en-US" type="STRING">"testtext" Site:""</QueryText>
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How are you calling the webservice? .NET code somewhere? – Kit Menke Aug 21 '13 at 19:46
Adding queryServiceSoapClient.ClientCredentials.Windows.AllowedImpersonationLevel = TokenImpersonationLevel.Impersonation; solved the issue. I didn't quite understand why that is the case though. – Vivek Aug 27 '13 at 18:46

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