Nethereum: Nethereum.JsonRpc.RpcClient - Error occurred when trying to send rpc requests(s)

Hi,

I have tried to use your library and I have a problem.

My code is very simple:

var web3 = new Web3("https://mainnet.infura.io");
var balance = web3.Eth.GetBalance.SendRequestAsync("0xB5c15851bb50b0f43F743c30dFaDf3F6F512d494").Result;
var value = Web3.Convert.FromWeiToBigDecimal(balance);
var str = value.ToString();

and I get a exception on SendRequestAsync. Here is my exception:

System.AggregateException was unhandled by user code
  HResult=-2146233088
  Message=One or more errors occurred.
  Source=mscorlib
  StackTrace:
       at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
       at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
       at System.Threading.Tasks.Task`1.get_Result()
       at WFA_Nethereum01.Form1.<bRefreshBalance_Click>d__1.MoveNext() in D:\Lada\Nethereum\WFA_Nethereum01\WFA_Nethereum01\Form1.cs:line 51
  InnerException: 
       HResult=-2146233088
       Message=Error occurred when trying to send rpc requests(s)
       Source=Nethereum.JsonRpc.RpcClient
       StackTrace:
            at Nethereum.JsonRpc.Client.RpcClient.<SendAsync>d__17.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
            at Nethereum.JsonRpc.Client.RpcClient.<SendInnerRequestAync>d__12`1.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
            at Nethereum.JsonRpc.Client.ClientBase.<SendRequestAsync>d__8`1.MoveNext()
       InnerException: 
            HResult=-2146233088
            Message=There was an error sending request.
            Source=mscorlib
            StackTrace:
                 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
                 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
                 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
                 at Nethereum.JsonRpc.Client.RpcClient.<SendAsync>d__17.MoveNext()
            InnerException: 
                 HResult=-2146233079
                 Message=Parent connection closed: An unexpected error occurred while sending.
                 Source=System
                 StackTrace:
                      at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
                      at System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar)
                 InnerException: 
                      HResult=-2146232800
                      Message=Unable to read data from the transport connection: Existing connection has been forced terminated by a remote host.
                      Source=System
                      StackTrace:
                           at System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
                           at System.Net.PooledStream.EndWrite(IAsyncResult asyncResult)
                           at System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)
                      InnerException: 
                           ErrorCode=10054
                           HResult=-2147467259
                           Message=Existing connections have been forced terminated by a remote host
                           NativeErrorCode=10054
                           Source=System
                           StackTrace:
                                at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
                                at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
                           InnerException:

I don’t know where is the problem. Can you help me?

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 30 (12 by maintainers)

Most upvoted comments

This is working for me Thanks

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3;

rakesh79mca on Apr 9, 2019

Hi I am facing the same issue I am using .NET 6.0. Here’s my code

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
var web3 = new Web3("https://mainnet.infura.io/v3/7238211010344719ad14a89db874158c");
var balance = await web3.Eth.GetBalance.SendRequestAsync("0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae");
var etherAmount = Web3.Convert.FromWei(balance.Value);
Console.WriteLine("balance is "+etherAmount);

Am I missing something?

@juzer-hakimji I had the same issue. Probably the infura project id in the nethereum docs is expired. I just got a new project id from infura.io and changed it as https://mainnet.infura.io/v3/my_project_id in the code(new Web3) and it resolved. I hope this works for you too.

ErenTl on Jun 13, 2022

Hi, I use version 4.6.1 and you have true. The problem was in TLS. Solution: System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3;

ladinek82 on Oct 23, 2018

@Fabio-GitHub25 sure what you are seeing is the default calculation of price to use 1559, so in your scenario 1559 is not supported so you need to revert to the Legacy price calculation (the old one)

eip 1559 is something specific for Ethereum that uses rpc apis that won’t be implemented in Telos

Ahh ok got it. Thanks for your help 😃

Fabio-GitHub25 on May 27, 2022

Ah, you need to set the web3.Eth.TransactionManager to Legacy Mode.

juanfranblanco on May 27, 2022

@alejandrasg @Khay-EMMA can you post a sample ? Are you using the settings at the bottom of the docs: https://docs.nethereum.com/en/latest/Nethereum.Workbooks/docs/nethereum-gettingstarted-infura

Note: some communication errors can occur with INFURA if INFURA’s API and your app can’t agree on what version of TLS to use. .Net 4.5 and earlier will default to TLS v1, with TLS v1.2 deactivated if it’s included in the framework. (In .Net 4.6.*, v1.2 is the default.)

To enable v1.2 in 4.5.2 you can use:

System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;

Notice the use of |= to turn on 1.2 without affecting other protocols (that way you remain able to take advantage of future TLS versions that may become the default values in future updates to .NET).

Or may work better for you, as per the comments:

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3;

juanfranblanco on Jun 20, 2019