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    <p>Well, I just spent six hours thinking I was going insane chasing something similar. In my case, I was using DotNetOpenAuth for a single-sign on implementation, just like my five other servers. But this new server would vomit 99% of the time:</p> <pre><code>DotNetOpenAuth.Messaging.ProtocolException: Error occurred while sending a direct message or getting the response. ---&gt; System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---&gt; System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream. at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count) at System.Net.Security._SslStream.StartFrameBody(Int32 readBytes, Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security._SslStream.StartFrameHeader(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security._SslStream.StartReading(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security._SslStream.ProcessRead(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.TlsStream.Read(Byte[] buffer, Int32 offset, Int32 size) at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size) at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead) --- End of inner exception stack trace --- at System.Net.HttpWebRequest.GetResponse() at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse(HttpWebRequest request, DirectWebRequestOptions options) --- End of inner exception stack trace --- at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse(HttpWebRequest request, DirectWebRequestOptions options) at DotNetOpenAuth.Messaging.UntrustedWebRequestHandler.GetResponse(HttpWebRequest request, DirectWebRequestOptions options) at DotNetOpenAuth.Yadis.Yadis.Request(IDirectWebRequestHandler requestHandler, Uri uri, Boolean requireSsl, String[] acceptTypes) at DotNetOpenAuth.Yadis.Yadis.Discover(IDirectWebRequestHandler requestHandler, UriIdentifier uri, Boolean requireSsl) at DotNetOpenAuth.OpenId.UriDiscoveryService.Discover(Identifier identifier, IDirectWebRequestHandler requestHandler, Boolean&amp; abortDiscoveryChain) at DotNetOpenAuth.OpenId.IdentifierDiscoveryServices.Discover(Identifier identifier) at DotNetOpenAuth.OpenId.RelyingParty.AuthenticationRequest.Create(Identifier userSuppliedIdentifier, OpenIdRelyingParty relyingParty, Realm realm, Uri returnToUrl, Boolean createNewAssociationsAsNeeded) </code></pre> <p>To really question my sanity,</p> <ul> <li>Visiting the SSL endpoint in the Web browser worked just fine</li> <li>Turning on Fiddler capturing made it work, and turning it off made it not work</li> <li>It really did work by itself about 1% of the time</li> <li>Using an <code>HttpWebRequest</code> in a console app to the same endpoint worked, but switching to DotNetOpenAuth (which appears to be doing more or less the same thing) caused it to mostly not work</li> </ul> <p>After checking about every possible thing that can be checked, I went into the Network Adapter properties (in my case, a Citrix PV Ethernet Adapter on the Rackspace Cloud), clicked Configure, went to Advanced, and <strong>disabled IPv4 Checksum Offload</strong>. Then it started working immediately.</p> <p>I have no idea what IPv4 Checksum Offload does, but it didn't work reliably on this virtual machine. Hope this helps someone else!</p>
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    1. POMostly Failing HTTPWebRequest over SSL in Azure - The Underlying Connection was Closed
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    1. USNicholas Piasecki
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    1. CONicholas... this definitely fixed the "Underlying connection closed" error for me, but download speed has dropped to about 1kb/s as a result of disabling IPv4 Checksum Offload.
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    2. COHmm, I haven't seen that, but I did disable all of the offloading functions, not just IPv4 Checksum Offload. When I raised the issue with Rackspace support, they recommended turning off offloading for Windows servers. (It used to be disabled by default, but I think they missed this detail in their new Performance server images.)
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