How do I fix VPN with an unsuccessful domain name resolution?

If you’re experiencing issues with your VPN and are unable to access websites due to unsuccessful domain name resolution, don’t worry – you’re not alone. This frustrating problem can occur for a variety of reasons, but fortunately, there are several solutions you can try to fix it. In this guide, we’ll explore some of the most effective troubleshooting steps you can take to resolve domain name resolution errors and get your VPN up and running smoothly again. Whether you’re a novice user or an experienced tech enthusiast, this guide will provide you with the knowledge you need to solve this common VPN issue.

What is a Domain Name Resolution in VPN?

Domain name resolution is the process of translating human-readable domain names (like “”) into IP addresses (like “”), which computers and other devices use to connect to websites and other online resources. When you connect to a VPN, all of your internet traffic is routed through the VPN server, which means that the VPN’s DNS (Domain Name System) resolver is responsible for handling domain name resolution requests instead of your device’s default DNS resolver.

If your VPN is experiencing issues with domain name resolution, it means that the VPN’s DNS resolver is unable to translate domain names into IP addresses, which can prevent you from accessing websites and other online resources. This can occur for a variety of reasons, such as misconfigured VPN settings, network connectivity problems, or issues with the VPN provider’s DNS servers.

So what’s the Domain Resolution Error about?

The failure of the VPN connection is due to an error in resolving domain names, which can be caused by DNS issues with Cisco VPN. To resolve this problem, one option is to change the DNS settings, and another is to modify certain key files. However, these solutions may not always be easy to implement, so a guide may be helpful in addressing this issue. In some cases, a complete system reset may be necessary, but this can be a burdensome task.

When using Cisco AnyConnect Secure Mobility Client for remote connection to work, the error message “vpn failed due to unsuccessful domain name resolution” is a common occurrence. Typically, if there are any issues with the VPN service or AnyConnect failures, it’s advisable to seek assistance from the system administrator. This problem often results from incorrect settings on the client’s side.

Ways to fix unsuccessful domain name resolution

Encountering an error in domain name resolution can cause the VPN connection to fail, leaving you frustrated and unable to connect to your desired network. If you are facing this issue, don’t worry as there are some solutions that you can try to resolve it. Here are some of the solutions that may help:

Change Your DNS Settings

To fix the “unsuccessful domain name resolution” error, you can try changing your DNS settings. This can be done by following a few simple steps on your Windows 10 device.

  • Firstly, right-click on the Start button and select “Network Connections > Change adapter options”.
  • Then, right-click on your network adapter and select “Properties”. Double-click on “Internet Protocol Version 4 (TCP/IPv4)” and select “Obtain DNS server address automatically”.
  • Finally, click “OK”. If you are using custom DNS settings, like Google Public DNS, OpenDNS, or Cloudflare, you may receive a DNS error warning.

In this situation, you can try setting your computer’s DNS to default by using the DNS servers provided by your ISP. If the problem persists, contact your ISP. If your ISP’s DNS servers are slow, you can try using other static DNS servers.

Try a Different VPN Service

If you are frequently experiencing DNS issues, you may want to consider switching to a different VPN service. A reliable VPN provider should offer essential security features, such as encryption and location masking, to ensure that your data is protected and you can access blocked websites and content. We recommend choosing a trustworthy and up-to-date provider that offers these essential features.

Repair the AnyConnect.xml File

If AnyConnect’s XML profiles become corrupted, it can cause the VPN connection to stop working. To fix the issue, you can reinstall AnyConnect or check the XML file for the DNS name, port address, and port number to verify that it is correct.

Reinstall Your Operating System

If all else fails, you can try reinstalling your operating system. However, this should be considered a last resort, as it will restore all system settings to their default state. You can back up all your data before restoring Windows 10, or use the Refresh Tool to perform a clean installation.

By trying these solutions, you should be able to resolve the “VPN Connection Failed Due to Unsuccessful Domain Name Resolution” error with Cisco AnyConnect on Windows. If the problem persists, we recommend discontinuing Cisco VPN and opting for a more robust and reliable VPN solution.

Ways to fix Unsuccessful Domain Name Resolution on Mac

Encountering the “unsuccessful domain name resolution” error while attempting to connect to a VPN on your Mac can be a frustrating experience. There are a number of possible causes for this issue. One potential reason is an incorrect VPN address, in which case it is recommended that you contact your VPN provider to obtain the correct address.

Another possible cause for this error message is your network settings. If you are using a proxy server or firewall, it is important to ensure that it allows access to the VPN address. Restarting your computer is also a possible solution that may resolve the issue.

However, if the above methods do not resolve the issue, it is advisable to seek additional assistance from your VPN provider. They can offer more detailed guidance on how to resolve this issue specifically for your Mac.


Why am I getting the “VPN connection failed due to unsuccessful domain name resolution” error?

This error typically occurs when your VPN client is unable to resolve the domain name of the VPN server, preventing you from establishing a secure connection. To fix this error, you may need to change your DNS settings or try connecting to a different VPN server.

What causes unsuccessful domain name resolution?

Unsuccessful domain name resolution can be caused by a variety of factors, such as incorrect DNS settings, network issues, firewall settings, or outdated software.

How do I change my DNS settings?

To change your DNS settings, go to your network settings and select the option to manually enter DNS server addresses. You can use public DNS servers like Google DNS, OpenDNS, or Cloudflare DNS, or you can use your ISP’s DNS servers.


In conclusion, experiencing an unsuccessful domain name resolution error can be frustrating, especially when you need to connect to a VPN for work or personal reasons. However, there are several potential solutions to this issue, such as changing your DNS settings, trying a different VPN provider, repairing the AnyConnect.xml file, or reinstalling your operating system as a last resort.

It’s important to keep in mind that some of these solutions may require technical expertise or assistance from your VPN provider, but hopefully, these tips will help you get your VPN connection back up and running smoothly. Remember to always prioritize your online security and privacy by using a reliable and trustworthy VPN provider.

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