Fix: Rainbow Six Siege Connection Failure Error 2-0x0000c015

The Rainbow Six Siege error 2-0x0000c015 occurs when your connection is interrupted by a third-party service or your network configuration to the game data centre. The error message pops up mid of the game during which the game usually freezes for a few seconds. Subsequently, the Connection Failure error message pops up which disconnects the user from the server.

Rainbow Six Siege Error 2-0x0000c015

The said issue has been around for quite a while now and it has been plaguing the gaming experience of various users. In some regions, the issue happened to be due to the government or ISP restrictions which were blocking various ports for unknown reasons. Nonetheless, we will be listing a number of solutions that you can follow to help resolve the issue. But before we get into that, let us have a look at the causes of the issue in more detail.

We went through several user reports and gathered a list of various causes that were being the root of the issue for different users. Here are the reasons that usually cause the error:

  • Third-party Antivirus: As it turns out, some third-party antivirus installed on your system can interrupt the connection due to which the error message pops up. If this case is applicable to you, you will have to either uninstall the third-party software or create some exclusions.
  • Network Configuration: The issue can also occur due to your network configuration. This, in this particular case, points to the DNS and your IP address. Since the issue refers to a connectivity issue, this is one of the more likely causes of the said error message. If this case is applicable to you, then you will have to flush your DNS or maybe even use a different available DNS other than your ISP. Government and ISP restrictions can also result in the said issue.
  • Blocked Ports: In some cases, the issue can be due to the various ports blocked on your network. In such a scenario, you will have to manually forward the ports so that the game server can easily connect to your system. When the game is not able to establish a connection with the data centre using the specified ports, your game will certainly disconnect.

Now that we have gone through the causes of the said error message, let us get into the solutions that you can implement to get rid of the issue for good. The below solutions have been reported as working by other users so they are very likely to work for you too.

1. Disable Third-Party Antivirus

As it turns out, some of the third-party antivirus suites are overprotective and usually interrupt with connections that are being established with your system which often causes certain issues such as this one. This happens when your antivirus suite thinks that the connection being established is not safe and therefore often terminates it or meddles with it. To avoid this kind of behaviour, you will have to create exclusions on your antivirus suite for Rainbow Six Siege so that it is not scanned when you are mid-game.

Alternatively, a good and recommended method of completely omitting the indulgence of your antivirus suite would be to uninstall it from your system and then remove any remaining files. Doing so will completely remove the trace of the antivirus software on your system.

Here’s how to uninstall your antivirus software:

  1. Press the Windows key to open up the Start Menu.
  2. Once the Start menu has opened up, type in Control Panel and then press Enter to open the Control Panel window.
  3. Once there, under Programs and Features, click on Uninstall a Program.
    Control Panel
  4. Here, you will be shown a list of the installed applications on your system. Scroll through the list and locate your antivirus software.
  5. Once you have found it, double-click on it and then click Yes when the UAC dialog box appears. Follow the on-screen prompts to complete the uninstallation.
  6. After you have uninstalled the antivirus software, you will have to remove the remaining files that are stored usually stored in the AppData directory.

After you have done so, try joining a game again and see if the issue persists. If so, move on to the next solution.

2. Flush your DNS

As we have mentioned, your network configuration is very likely to be the cause of the issue. Your DNS settings are usually the culprit in this scenario. Therefore, to resolve the issue, you will have to flush your DNS and then see the issue persists. However, before doing this, we recommend verifying the integrity of game files so that you are sure that the issue is not because of missing or corrupted game files.

Once you have done that, you can move on to flushing your DNS. Doing this is very easy and can be done pretty quickly. You might have to do flush your DNS a few times before the issue is resolved as reported by a user who was facing the issue. To flush your DNS, please follow the below instructions:

  1. Press the Windows Key + R to open up the Run dialogue box.
  2. Type CMD and then press Enter. This will open up the Command Prompt.
  3. Once the command prompt has opened up, type in “ipconfig /flushdns” without the quotation marks and then press Enter.
    Flush DNS
  4. Repeat this a few times as mentioned above.
  5. Close the command prompt.

Head to your game and see if the issue is still there.

3. Change your DNS Server

Another thing you can do is change your network settings to use a different DNS server. Certain ISPs block various connections due to which the users often face connectivity issues. The workaround here would be to configure your network to use a public, robust and private (in terms of privacy) DNS server other than the default one which is controlled by your Internet Service Provider.

For this purpose, there are various public DNS servers that you can use. However, we would recommend using the DNS server provided by Cloudflare due to its robust and privacy features. The IP is To change your DNS server, please refer to the How to Change DNS in Windows 10 article published on our site that explains the said thing very thoroughly.

4. Forward Ports used by Rainbow Six Siege

If the above solutions have failed to resolve the issue for you, it can be due to the fact that the game is not able to establish a connection with the game server, hence the connectivity failure. To resolve this, you will have to manually forward the ports provided by Ubisoft on this page.

Port forwarding can be different depending on the router/modem you are using as well as the manufacturer. However, for the sake of reference, you can check how to forward ports for online gaming. You will just have to replace the ports with the ports provided by Ubisoft in the above-mentioned link.


Kevin Arrows

Kevin Arrows is a highly experienced and knowledgeable technology specialist with over a decade of industry experience. He holds a Microsoft Certified Technology Specialist (MCTS) certification and has a deep passion for staying up-to-date on the latest tech developments. Kevin has written extensively on a wide range of tech-related topics, showcasing his expertise and knowledge in areas such as software development, cybersecurity, and cloud computing. His contributions to the tech field have been widely recognized and respected by his peers, and he is highly regarded for his ability to explain complex technical concepts in a clear and concise manner.