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In my WCF service, when trying transfer large data I constantly get an error: The underlying connection was closed: The connection was closed unexpectedly I want to know what particular reason invokes this error, so I set up WCF Tracing and can read traces.svclog file. The problem is, that I can see in this file a lot of information about flow of processes, I can see exact time when exception is appeared, but I can't see the exact reason for that. Is it due to MaxReceivedMessageSize or something like that. Is it so that traces.svclog can not contain such information or am I doing something wrong? How such information could be obtained? Edited (added): From my server-side app.config: <system.serviceModel> <bindings> <basicHttpBinding> <binding name="NAVBinding_ICustomer_Service" closeTimeout="01:50:00" openTimeout="01:50:00" receiveTimeout="01:50:00" sendTimeout="01:50:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="2147483647" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"> <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" /> <security mode="None"> <transport clientCredentialType="None" proxyCredentialType="None" realm="" /> <message clientCredentialType="UserName" algorithmSuite="Default" /> </security>

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