Hi All,
I was trying to download the SharePoint files using a .NET console application with the help of Microsoft SharePoint online client. it was working fine in my windows 8 laptop & Windows 2008 r2 sp1 server until last week. from 28/06/2021 it stopped working from the server. I am getting the following error while connecting to the SharePoint using my application.
I am using a .NET 4.5 console application with SharePoint client DLL version 16.1.0.0. Could you please do some help to resolve this issue.
PS:- I was able to browse the SharePoint site in that server using the web browser without any issues and I am using the following code to force TLS 1.2 in the code.
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
The error I am getting is as below.
System.IO.IOException: Unable to read data from the transport connection: An exi
sting connection was forcibly closed by the remote host. ---> System.Net.Sockets
.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 s
ize)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 s
ize)
at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 c
ount)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocol
Request asyncRequest)
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToke
n message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byt
e[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyRes
ult)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionCo
ntext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, C
ontextCallback callback, Object state, Boolean preserveSyncCtx)
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)
Thanks
Joby