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Operation was attempted on a nonexistent network connection error

In my C# SignalR project, Facing the internal socket error during the hubconnection dispose and sometimes the code wont run, showing the exception provided below and also after the first execution , will be running fine for sometime. Is there anything that need to be done along with the hubconnection disposal or how the hubconnection disposal can be achieved properly so that this problem won't be recurring?
System.AggregateException: One or more errors occurred.
System.Net.Http.HttpRequestException: An error occurred while sending the request.
System.Net.WebException: Unable to connect to the remote server
System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it.
Stack Trace:
Socket.InternalEndConnect(IAsyncResult asyncResult)
Socket.EndConnect(IAsyncResult asyncResult)
ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
HttpClientHandler.GetResponseCallback(IAsyncResult ar)
--- End of inner exception stack trace ---
Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
Task.Wait()

Selenium WebDriver Socket Exception

Everything was working fine till yesterday and from today onward , I have started facing the issue intermittently at any stage but frequently
{"Unexpected error. System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: Only one usage of each socket address (protocol/network address/port) is normally permitted 127.0.0.1:21235\r\n at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)\r\n at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)\r\n --- End of inner exception stack trace ---\r\n at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)\r\n at System.Net.HttpWebRequest.GetRequestStream()\r\n at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo requestInfo)\r\n at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)\r\n at OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute)\r\n at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)"}
I have already tried basic stuffs, like see if port is not in use already or bind to someone, but that doesn't seem to be the issue.
Not sure, what's wrong, anybody else has any idea or have faced something similar then please help me out here
Thanks in Advance

Connection Error on Microsoft Bot after publishing it on AWS

I am trying to publish a bot that I coded in C# through visual studio 2015 on to AWS. I installed the Amazon Cloud SDK and was able to successfully publish the bot to AWS. I updated the bot endpoint with the address it gave (http://benbot-dev.us-west-2.elasticbeanstalk.com/). But when I go to Microsoft Bots site and test the bot connection it says Unable to connect to the remote server. Please help. I am thinking it is the https endpoint issue. But I am not sure how to get an API Gateway endpoint, if I should.
<<<<<<<<<<
500 InternalServerError
System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 52.42.245.162:443
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
at System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar)
--- End of inner exception stack trace ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Intercom.DevPortal.Server.Controllers.BotManagerController.<PingV3BotAsync>d__54.MoveNext() in C:\a\1\s\DevPortalLib\Controllers\BotManagerController.cs:line 1420
>>>>>>>>>>>>>>>>

This exception message tells you that within your server code you are trying to reach server at 52.42.245.162, and this server is inaccessible (more specifically, https port 443 is inaccessible). This IP resolves to some AWS host (use nslookup command to find this out, see this answer). You can try to ping this IP, or try to see if port 80 is accessible (both are not from my host). Or you can try to enumerate if any other ports are open on that host (search google/bing for instructions how to do that). If you can't reach that port from your host, Microsoft Bots site can't reach it either. If your service is running on that IP, the most probably cause is that you have to open the port on AWS to be accessible from public internet (search google/bing for aws open port or aws allow ssh)

PayPal Sandbox Code Integration IPN Problem with Asp.net/C#

I need your help regarding PayPal code integration with my asp.net/c# on PayPal Sandbox, I am using PayPal IPN and the code is same as provided by PayPal. I am working on local host. Payment has gone fine on PayPal and I have received the amount on my PayPal Sandbox account but when PayPal redirects it to my website page it shows me the following exception:
"Unable to connect to the remote serverSystem.Net.Sockets.SocketException (0x80004005): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 192.168.10.9:8080 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception) at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context) at System.Net.HttpWebRequest.GetRequestStream() ".
I will really appreciate your help!

WebException: Unable to connect to the remote server

I have a client application that uses WebHttpRequest to get response from external server, it works fine but some times I'm getting the following exception ....
System.Net.WebException: Unable to
connect to the remote server --->
System.Net.Sockets.SocketException: A
connection attempt failed because the
connected party did not properly
respond after a period of time, or
established connection failed because
connected host has failed to respond
xx.xx.xxx.xxx:xxx at
System.Net.Sockets.Socket.DoConnect(EndPoint
endPointSnapshot, SocketAddress
socketAddress) at
System.Net.Sockets.Socket.InternalConnect(EndPoint
remoteEP) at
System.Net.ServicePoint.ConnectSocketInternal(Boolean
connectFailure, Socket s4, Socket s6,
Socket& socket, IPAddress& address,
ConnectSocketState state, IAsyncResult
asyncResult, Int32 timeout, Exception&
exception) --- End of inner
exception stack trace ---
at
System.Net.HttpWebRequest.GetRequestStream(TransportContext&
context)
at
System.Net.HttpWebRequest.GetRequestStream()
.... Any help?

This is more of a "Request Timed Out" error. The server you are trying to connect to did not respond to your request. You should handle this exception using try-catch and attempt to connect n number of times again in the catch block.