An Existing Connection Was Forcibly Closed by the Remote Host – How to Fix it

Have you recently been facing the “An existing connection was forcibly closed by the remote host” error on your system? This problem usually happens when you try connecting with any remote host, and the process fails. After going through the various complaints and grievances reported by the users, we looked into the issue and carved out the best solutions.

An existing connection was forcibly closed by the remote host

Be patient and read the article.

What are the reasons behind the “An existing connection was forcibly closed by the remote host” error?

The lack of a physical presence characterizes the remote computer. This means that the only way to access this computer is through a computer network. The computer that hosts the network for the particular remote computer thereby is called the Remote Host. The user that operates the remote computer through the network is called the Remote Client. This is a great feature and revolutionized compute processing.

However, recently this connection between the host and client has been facing errors.

But before we begin, let us also take you through the causes that are the potential problem-makers so that you do the fixing better:

  • Disabled cryptography – If you have not noticed that the feature of Cryptography is disabled on the machine you are using, it will hinder the machine from using the TLS 1.2, and it will get the application back to the TLS 1.0 usage. This auto depreciation triggers the error.
  • The usage of TLS 1.0 / 1.1 – If the application is using the TLS 1.0 or TLS 1.1 for operation and storage, then there are high chances that the depreciated TLSs are causing the error. The right type of TLS to be used is the TLS 1.2 while selecting the right protocol to be used by the application.
  • Faulty socket implementation – There are some cases where a specific socket implementation becomes the reason behind the lost connection error. The associated .NET application that causes the implementations might have got some bugs and thereby become the trouble maker.
  • Lost code – Some of the users who have been working with the Entity Framework was also found facing the error. This was being caused by a specific line of code that was lost, and this was causing trouble in the operation of the application.
  • An older .NET Framework – In some of the cases where the “An existing connection was forcibly closed by the remote host” error was being caused; the reason was the .NET framework being disabled. There some tasks of the system that need the latest version of the framework to be installed on the PC for running properly. If the condition is not fulfilled, then they cease to function.

Five best methods to fix the connection error

Pick any of these solutions as per the issue that is causing the error.

Besides, here, you will figure out what is the ETD Control Center and the top best Android network monitor.

Method 1: Enable the Cryptography to fix ‘An Existing Connection Was Forcibly Closed by the Remote Host’

One of the prime reasons why you have been seeing the error message saying “An existing connection was forcibly closed by the remote host” is that TLS 1.2 is being prohibited from running on the machine. This hindered the Cryptography from being operational thereby and caused the problem. A logical solution that will follow is to enable Cryptography as that will potentially solve the issue.

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Below is the series of steps that you need to follow for enabling the Cryptographic operation:

1. Press the keys Windows + R together for launching the prompt of Run Dialogue box.

2. Enter the command regedit. Now hit the button of entering.


3. Navigate down and then find the address:


4. Look inside the right pane, and if you don’t find any value like “SchUseStrongCrypto,” then you will have to find this address:


5. Again, look through the right window pane and hit a right-click over the option of “SchUseStrongCrypto.” Then enter the number 1 as the value of the data that is being entered.

Enable the Cryptography

6. Lastly, click on the option OK for saving the changes that you made successfully.

Now go back to run the operation you were running previously and see if the error is gone.

Also, if you are bothered with the issue of the connection problem or invalid MMI code, click to fix it now.

Method 2: Force launching the usage of TLS 1.2 to fix ‘An Existing Connection Was Forcibly Closed by the Remote Host’

It might not have come to your notice, but the application that you have been trying to run might have experienced certain changes in its configuration. Sometimes the configuration of the user settings of any application is found to be set at TLS 1.0 or TLS 1.1, while the correct option should be TLS 1.2. This change can become the reason for the error “An existing connection was forcibly closed by the remote host.” This method will be dealing with the error by changing such configurations of the system and set it to TLS 1.2. Follow the steps given below:

1. Navigate and find the root folder of the particular website. Now hit a right-click over the file with the name global.asax.

2. Select the option of View Code from the given list.

3. Find the option of the method named ‘Application_Start‘ that must be there in the next window pane. The line of code that we give you down below needs to be added in the particular method:

if (ServicePointManager .SecurityProtocol.HasFlag (SecurityProtocoType.Tls12) == false)
ServicePointManager.SecurityProtocol = ServicePointManager.SecurityProtocol | SecurityProtocolType.Tls12;

Force launching the usage of TLS 1.2

4. Save these changes that you made.

Go back to running the previous operation and see if the method has removed the error.

Method 3: Change the socket implementation to fix ‘An Existing Connection Was Forcibly Closed by the Remote Host’

Another probable reason why the error “An existing connection was forcibly closed by the remote host” has been creating troubles with the program that you have wanted to operate is a faulty socket implementation. Sometimes it happens that any glitch or bug that might have affected the socket implementation related to the program. This then hinders the program’s concerning elements from running smoothly, and the error as mentioned earlier is the result. In this method, we sought to configure and set up a new implementation, which will be different from the previous one.

Follow the steps as we give below:

1. Before starting the process, make sure to run a proper check and ensure that the class named StateObject is available with you. The code “public byte[] buffer = new byte[1024], public Socket socket;” should be there too.

2. Make a call over the function named “Receive (Socket s)” and then call in the mentioned code “void ReceiveCallback(IAsyncResult ar)

SocketError errorCode;
Int nBytesRec = socket.EndReceive (ar, out errorCode);
If (errorCode != SocketError.Success)
nBytesRec = 0;

Once you have successfully implemented this code, go back, and see if the error remains. It would probably be solved by now. If it is not, move ahead with the next methods that we give you for dealing with the error “An existing connection was forcibly closed by the remote host.”

Method 4: Add the Command Lines (for the users of Entity Framework)

If you have been a user of the Entity Framework, then there might be a possibility that a particular line of code must have been left out. We aim to deal with this issue in this method, where we will add the missing line of code for fixing the final issue of host error.

Follow the steps below for doing so:

1. Open the file named ‘.edmx.’ on the system that you are using. You will then find a file named ‘‘ below the previous file. Open it to.

2. Now open the file named ‘.context.cs‘. In the associate constructor, you need to enter the line of code that we give you below:

Public DBEntities ()
: base(“name=DBEntities”)
This.Configuration.ProxyCreationEnabled = false; // ADD THIS LINE !

Once the command runs successfully, go back to the application that you were trying to open and see it has gone error-free now.

Method 5: Update the .NET Framework

Many elements need to operate nicely for any application to run smoothly. The .NET framework is one such component, and you need to have the latest version of this framework installed on your PC for ensuring the proper functioning of the related applications. Therefore, this method will be dealing with the installation of the updated version of the .NET framework from the right website.

Follow the steps to do so:

1. Open the official website of Microsoft for downloading the setup of the concerned framework. Finish the download and begin to install the setup properly.

2. Find the .exe file in the setup and open it for executing it. This will begin the process of installing the framework program.

Update the .NET Framework

3. Keep following the instructions as they appear on the screen for installing the application properly on the PC that you are using.

Now go back to run the program that you were previously trying to. See if this method has successfully removed the error of “An existing connection was forcibly closed by the remote host.”

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The error “An existing connection was forcibly closed by the remote host” hampers the connection between the server and the client. We hope that the solutions helped to rectify the error and get rid of it altogether.