Comment accéder à un site Web sécurisé dans un site Web sharepoint?

Question

Comment accéder à un site Web sécurisé dans un site Web SharePoint? Le code suivant fonctionne très bien comme une application de la console, mais si vous l'exécutez dans un webpart, vous obtiendrez une violation d'accès

WebRequest request = WebRequest.Create("https://somesecuresite.com"); 
WebResponse firstResponse = null; 
try 
{ 
    firstResponse = request.GetResponse(); 
} 
catch (WebException ex) 
{ 

    writer.WriteLine("Error: " + ex.ToString()); 
    return; 
} 

si vous accédez à un site non sécurisé, il fonctionne aussi. Des idées?

 
Error: System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> 
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. 
at System.Net.UnsafeNclNativeMethods.NativePKI.CertVerifyCertificateChainPolicy(IntPtr policy, SafeFreeCertChain chainContext, ChainPolicyParameter& cpp, ChainPolicyStatus& ps) 
at System.Net.PolicyWrapper.VerifyChainPolicy(SafeFreeCertChain chainContext, ChainPolicyParameter& cpp) 
at System.Net.Security.SecureChannel.VerifyRemoteCertificate(RemoteCertValidationCallback remoteCertValidationCallback) 
at System.Net.Security.SslState.CompleteHandshake() 
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest) 
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult) 
at System.Net.TlsStream.CallProcessAuthentication(Object state) 
at System.Threading.ExecutionContext.runTryCode(Object userData) 
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) 
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) 
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result) 
at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size) 
at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size) 
at System.Net.ConnectStream.WriteHeaders(Boolean async) --- End of inner exception stack trace --- 
at System.Net.HttpWebRequest.GetResponse() 

Answer 1

i déjà eu ce problème et résolu par la méthode overiding GetWebRequest: voir ici:

http://p2p.wrox.com/net-web-services/4586-underlying-connection-closed.html