An existing connection was forcibly closed by the remote host ошибка

For anyone getting this exception while reading data from the stream, this may help. I was getting this exception when reading the HttpResponseMessage in a loop like this:

using (var remoteStream = await response.Content.ReadAsStreamAsync())
using (var content = File.Create(DownloadPath))
{
    var buffer = new byte[1024];
    int read;

    while ((read = await remoteStream.ReadAsync(buffer, 0, buffer.Length)) != 0)
    {
        await content.WriteAsync(buffer, 0, read);
        await content.FlushAsync();
    }
}

After some time I found out the culprit was the buffer size, which was too small and didn’t play well with my weak Azure instance. What helped was to change the code to:

using (Stream remoteStream = await response.Content.ReadAsStreamAsync())
using (FileStream content = File.Create(DownloadPath))
{
    await remoteStream.CopyToAsync(content);
}

CopyTo() method has a default buffer size of 81920. The bigger buffer sped up the process and the errors stopped immediately, most likely because the overall download speeds increased. But why would download speed matter in preventing this error?

It is possible that you get disconnected from the server because the download speeds drop below minimum threshold the server is configured to allow. For example, in case the application you are downloading the file from is hosted on IIS, it can be a problem with http.sys configuration:

«Http.sys is the http protocol stack that IIS uses to perform http communication with clients. It has a timer called MinBytesPerSecond that is responsible for killing a connection if its transfer rate drops below some kb/sec threshold. By default, that threshold is set to 240 kb/sec.»

The issue is described in this old blogpost from TFS development team and concerns IIS specifically, but may point you in a right direction. It also mentions an old bug related to this http.sys attribute: link

In case you are using Azure app services and increasing the buffer size does not eliminate the problem, try to scale up your machine as well. You will be allocated more resources including connection bandwidth.

The way Minecraft inspires players and its unique aesthetic make it stand out. So in 2020, Minecraft is still incredibly popular. But while mining the landscape, players report encountering an error saying “An existing connection was forcibly closed by the remote host”. If you happened to be one of them, don’t worry. In this article, you’ll definitely pinpoint the cause.

Try these fixes

You may not need to try them all; just work from the top down until you find the one that works.

1. Turn off Windows Firewall
2. Create a new registry value
3. Reset your last session on Hypixel
4. Flush your DNS cache
5. Change your DNS server
6. Update your drivers
7. Configure Java settings with the Control Panel
8. Restart your network

Fix 1: Turn off Windows Firewall

It’s important to have Microsoft Defender Firewall on because it helps protect you from unauthorized access. But there is a possibility that it fails to allow Minecraft to run. So to fix it, you should turn off Windows Firewall. Here’s how you can do this:

1) On your keyboard, press the Windows logo key and I at the same time to open the Settings app.

After you’ve done these and still can’t connect to the Minecraft server, move on to the next fix.

Fix 2: Create a new registry value

Creating a new registry value with Windows Registry is part of a troubleshooting step to fix some kind of bug with how Windows handles something. So to fix the connection lost error from Minecraft, you should create a new registry value:

3) Before you proceed in the registry, you’re supposed to create a backup of it so that if anything were to go wrong, you can easily restore it back.

• Click on the File tab and select Export.

  

• For the File name, we recommend naming it the date you create the backup. The Export range should be selected to All. Then Save it to a convenient location on your computer.

  

• If you need to import it back in, you just need to click on the File tab and select Import.

  

• The navigate to the file location.

4) Once you’ve created a backup, double-click on the folder HKEY_LOCAL_MACHINE > SOFTWARE.

5) From the list of folders, double-click on Microsoft.

6) Locate .NETFramework and double-click on this folder. It should be near the top of the list because it starts with a dot.

12) Now close the Registry Editor.

13) Restart your computer for the change to take effect. Then attempt to connect to the remote host once again and your issue should hopefully be resolved.

Fix 3: Reset your last session on Hypixel server

The Hypixel server was created to play and further showcase Minecraft adventure maps. By resetting your last session on the Hypixel server, it would probably fix the issue. Here’s how you can do this:

1) Open Minecraft. Click Multiplayer.

2) In the bottom, click Direct Connect.

This should reset your last session on Hypixel. See if that works. If not, then you should restart your router and flush your DNS cache.

Fix 4: Flush your DNS cache

Clearing the DNS cache on a regular basis can remove all the entries and deletes any invalid records. When you get the error from Minecraft, it’s mostly caused by internet connectivity problems. So flushing DNS cache will help you solve the problem. To do this, follow the steps below:

1) On your keyboard, press the Windows logo key and R at the same time to invoke the Run box.

2) Type cmd and then press Enter on your keyboard to open the Command Prompt.

3) Type ipconfig /flushdns and press Enter.

ipconfig /flushdns

Once you’ve successfully flushed the DNS cache, restart your computer and play your game to check if it works.

Fix 5: Change your DNS server

Sometimes your ISP-supplied DNS server might be slow or not properly configured for caching, which can effectively slow your connection. So it could be the reason why you’re getting the error from Minecraft. To fix it, you need to change your DNS server.

1) On your keyboard, press the Windows logo key and R at the same time to invoke the Run box.

2) Type control and then press Enter on your keyboard to open the Control Panel.

5) Click Properties.

6) Click Internet Protocol Version 4 (TCP /IPv4) > Properties.

7) Click Use the following DNS server addresses:.
In Preferred DNS server: section, type 8888.
In Alternate DNS server: section, type 8844.
Check the box next to Validate settings upon exit and then click OK.

After applying the changes, try playing your game and the connection issue should be resolved.

Fix 6: Update your drivers

When you encounter various issues and errors while playing a game like Minecraft, one of the troubleshooting steps you need to take is to check for drivers updates. If your drivers are outdated or not optimized, you may encounter poor performance or even can’t connect to the server. So if you receive the error “An existing connection was forcibly closed by the remote host”, you should update your drivers especially network adapter drivers and graphics drivers (Updating graphics drivers even worked for some players.)

There are two ways you can update your drivers: manually and automatically.

Option 1: Manually update your drivers

Manufacturers keep releasing driver updates. To get them, you need to go to the official websites, find the correct drivers, and download them manually. But you might risk downloading and installing the wrong drivers which are not compatible with your Windows version.

Option 2: Automatically update your drivers (recommended)

If you don’t have the time, patience, or computer skills to update drivers manually, you can do it automatically with Driver Easy.

Driver Easy will automatically recognize your system and find the correct drivers for it. You don’t need to know exactly what system your computer is running or risk downloading and installing the wrong driver.

1) Download and install Driver Easy.

2) Run Driver Easy and click the Scan Now button. Driver Easy will then scan your computer and detect any problem drivers.

3) Click the Update button next to the flagged driver to automatically download the correct version of that driver, then you can manually install it (you can do this with the FREE version).

Or click Update All to automatically download and install the correct version of all the drivers that are missing or out of date on your system. (This requires the Pro version which comes with full support and a 30-day money-back guarantee. You’ll be prompted to upgrade when you click Update All.)

The Pro version of Driver Easy comes with full technical support. If you need assistance, please contact Driver Easy’s support team at support@drivereasy.com.

After updating your drivers, restart your computer to check if you still get the same error.

Fix 7: Configure Java settings with the Control Panel

The Java settings set by default might not give you the best gaming experience. So configuring them might offer you a greater performance and even fix the error you’re receiving.

To do this, you should:

1) On your keyboard, press the Windows logo key and R at the same time to invoke the Run box.

2) Type control and then press Enter on your keyboard to open the Control Panel.

7) Now restart your computer and launch your game to check if it works. If not, move on to the next fix.

Fix 8: Restart your network

If you encounter the error “An existing connection was forcibly closed by the remote host” in Minecraft, perhaps there are some problems with your network. In this case, you should restart your network.

You can unplug both your router and modem and disconnect the ethernet cable for few minutes. Then reconnect the cable and plug in the modem back. Once the indicator lights are back to the normal state, check if the error has been resolved.

Hopefully, these fixes work for you. If you have any ideas or questions, please do not hesitate to leave us a comment.

Question

Issue: An existing connection was forcibly closed by the remote host Minecraft error – how to fix?

Hello, I can’t play Minecraft normally. At random times, an error shows up, saying, “An existing connection was forcibly closed.” I have not changed anything within my PC, so I wonder what is causing this. Any suggestions? Help would be much appreciated.

Solved Answer

Minecraft is one of the most popular video games in the world, enjoyed by the young and the mature. First developed in 2011, this sandbox game^[1] grew the playerbase to as many as 126 million users. However, while the game is a fun sandbox experience, it does not avoid issues, and An existing connection was forcibly closed by the remote host Minecraft error is one of them.

Players claimed that they would abruptly be disconnected from the game, and receive the following error message:

Connection lost

Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host

This can be extremely frustrating to users, as it interrupts their gaming sessions. In some cases, people claimed that they are unable to play Minecraft at all due to this problem.

An existing connection was forcibly closed error might show up seemingly out of nowhere, and it does not explain adequately why it occurred (at least not to regular computer users). As seen on the message text, it is claimed that a remote host has closed the connection.

In reality, the explanation is much more simple – you are receiving An existing connection that was forcibly closed by the remote host Minecraft error because your computer network connection failed to reach Minecraft servers.

Now, the reason why this would happen can vary from person to person, as each computer has its own set of configurations, so things happen (or don’t happen) due to various reasons. However, one of the most common issues for this problem was related to Microsoft Windows Firewall^[2] blocking the connection to Minecraft servers. Additionally, users with overly-protective antivirus can also experience this issue.

Therefore, there are several different ways to fix An existing connection was forcibly closed by the remote host Minecraft error, and we provide a comprehensive, step-by-step guide for you below. Keep in mind that different solutions will work for different situations, so try them all to see which one helps you.

Before you begin, we would like to suggest you try running a scan with ReimageMac Washing Machine X9, as it could achieve An existing connection was forcibly closed by the remote host Minecraft error fix automatically if the problem is related to the underlying Windows system issues.

Solution 1. Run network connection troubleshooter

Let’s start from very simple solutions and check whether your internet connection is not experiencing any issues – run Windows Network connections troubleshooter:

Solution 2. Let Minecraft through Firewall

Just like in the case of io.netty.channel.ConnectTimeoutException connection timed out Minecraft error, in incorrect Firewall settings might prevent you from being connected to Minecraft servers, causing An existing connection was forcibly closed by the remote host error. Here’s how to bypass this problem:

• Type in Control Panel in Windows search and press Enter
• Go to System and Security section
• Under Windows Defender Firewall, pick Allow an app through Windows Defender Firewall

  

• In the main window, select Change settings
• Scroll down until you locate all the Java (TM) Platform SE binary entries, and tick Private and Public checkboxes
• Click OK.

Solution 3. Use different DNS settings

• Right-click on Start and pick Network Connections
• On the right side of the window, pick Change adapter options

  

• When Network Connections window opens, right-click on the appropriate option (in our case, Ethernet), and select Properties
• Click on Internet Protocol Version 4 (TCP/IPv4) once and then select Properties at the bottom
• Select Use the following DNS server address and then type in the following into the fields:
  

  8.8.8.8
  8.8.8.9

• Press OK.

  

Solution 4. Disable NAT acceleration on your router (Asus routers only)

NAT Acceleration, also known as Cut-Through Forwarding, is a feature in Asus routers that can positively impact internet connection speeds when it is turn on. However, this can cause problems in some cases, and users said that turning this feature off helped them fix the Minecraft error.

• Login to your Asus wireless router panel
• Go to LAN > Switch Control
• Under NAT Acceleration, click on the drop-down menu and select Disable
• Click Apply.

  

Solution 5. Reset your router

Most ISPs (Internet Service Providers) assign you with a dynamic IP address,^[3] which means that it changes at certain time intervals, e.g., when you reboot your router. Thus, you should reboot the device and see if that helps to fix An existing connection was forcibly closed by the remote host Minecraft error:

• Go to your router and pull the connection wire out of it, or take it out of the electric socket
• Wait around a minute and re-connect your device
• Check if the error persists.

Note that you should not try to do this by pressing the Reset button on your router, as it could result in the device being reset to the factory settings.

Note 2: you can ask your ISP to provide you a static IP, although this service might not be free.

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