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POMassively increased new TCP connections # in .NET 4.5 over 4.0?
 

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  1. POMassively increased new TCP connections # in .NET 4.5 over 4.0?
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    <p>I am currently testing my WPF/WCF client application in .NET 4.5 vs 4.0 with a view of finally getting 4.5 rolled out to all client machines. The WCF portion uses BasicHttpBinding/SOAP. </p> <p>When testing the two client versions under the same conditions (Win7 etc), we're seeing a 10x increase in "New TCP connections" to the SOAP server endpoint - 4.0 clients establish ~450 per hour whilst 4.5 clients are establishing ~6,000. Since we're connecting to a remote server, this is troublesome as establishing a new TCP connection adds a large latency to the web service call.</p> <p>When using 4.0, We previously have tuned the client <code>ServicePointManager</code> settings to maximise our TCP connection reuse and expected these settings to be applicable to 4.5.</p> <p>My application generally performs one call at a time, perhaps every 10 seconds on average - with bursts of 10 concurrent calls every few minutes.</p> <p>I've had a look at the changelogs and cannot find any reference to fixes/changes that have been made to this part of .NET. Can anyone shed some light on what might be going on here?</p> <pre><code>ServicePointManager.UseNagleAlgorithm = true; ServicePointManager.Expect100Continue = false; ServicePointManager.DefaultConnectionLimit = 50; ServicePointManager.MaxServicePointIdleTime = 10000; Binding binding = new BasicHttpBinding { SendTimeout = TimeSpan.FromSeconds(_settings.SendTimeout), ReceiveTimeout = TimeSpan.FromSeconds(_settings.SendTimeout), MaxReceivedMessageSize = 1024 * 1024 * 10, MaxBufferSize = 1024 * 1024 * 10, MaxBufferPoolSize = 1024 * 1024 * 100, Security = { Mode = BasicHttpSecurityMode.TransportCredentialOnly, Message = { ClientCredentialType = BasicHttpMessageCredentialType.UserName }, Transport = { ClientCredentialType = HttpClientCredentialType.Basic }, }, }; </code></pre>
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    1. USTim Lloyd
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    1. COPerhaps your issue is related to this? - http://support.microsoft.com/kb/2538826 The issue could be to do with the way threads are being assigned to handle client requests.
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      1. USXefan
    2. CO@Xefan Interesting point, but that link refers to server side issues, rather than the point above which is related to client connections (the server is not WCF and has not changed).
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      1. USTim Lloyd
    3. COIs the server sending a chunked response by chance? There is a known issue where chunked responses can result in the connection getting closed instead of reused.
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      1. USJonCole
 

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