Question

Getting an error "underlying connection was closed"

Comments

Where are you getting this error from and what were you doing at the time?

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More details please. Where are you getting that error for example? Steps to generate the error?

If you would like help, please elaborate more and provide more information

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That error is generating in JsonRpcClient.cs file and line number is 44

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MultiChainConnection connection = new MultiChainConnection()
            {
                Hostname = "MYIP",
                Port = MYPORT,
                Username = "multichainrpc",
                Password = "password",
                ChainName = "chain1",
                BurnAddress = "Myaddress",
                RootNodeAddress = "Myaddress"
            };
            
MultiChainClient _Client = new MultiChainClient(connection);
response = _Client.Utility.GetInfo();

I try to call above method and node was started in my local machine & error message (Exception) is showing on the below method "JsonRpcClient.cs"

public JsonRpcResponse<T> Execute<T>(string method, int id, params object[] args)
        {
            JsonRpcResponse<T> response = new JsonRpcResponse<T>();
            Task.Run(async () =>
            {
                response = await ExecuteAsync<T>(method, id, args);
            }).GetAwaiter().GetResult();

            return response;
        }

Answer 1

Since this is an error given by a third party library your best bet is to reach out to that library's author and ask them to answer the question here.