The editor of Downcodes brings you a practical guide to solving DNS anomalies in computer networks. DNS abnormalities can lead to problems such as being unable to access web pages or slow network connections. This article will detail seven commonly used solutions, including checking network connections, updating DNS server addresses, clearing DNS cache, disabling IPv6, checking local hosts files, and closing Firewall or antivirus software and other possible fixes. Each method is accompanied by clear steps so you can quickly troubleshoot and resolve the issue. In addition, the article also comes with answers to frequently asked questions to help you understand DNS anomalies and their solutions more comprehensively, allowing you to easily deal with network problems.
Common methods to solve network DNS abnormalities on computers include checking the network connection, updating the DNS server address, clearing the DNS cache, disabling IPv6, checking the local hosts file, and turning off the firewall or anti-virus software. Most DNS-related problems can usually be solved through these steps. Among them, updating the DNS server address is a very effective method, because the default ISP DNS server may sometimes encounter failures or slow response. Replace it with one such as Google DNS (8.8.8.8 and 8.8.4.4) or OpenDNS (208.67.222.222 and 208.67.220.220) public DNS can improve resolution speed and stability.
Ensuring that the network connection is normal is the first step in handling DNS abnormalities. First, check whether network devices, including routers and modems, are working properly. Restarting these devices can sometimes solve temporary faults. If other devices are able to access the Internet normally, then the problem may be with your PC.
Verify network status by running network diagnostics to see if there are any network connection issues. In Windows, network troubleshooting tools can help detect and fix common network connection problems.
Changing the DNS server is an effective way to solve DNS problems. In the network settings of your operating system, you can change the DNS address to a more reliable DNS service provider. Changing DNS servers can usually be accomplished through the Network options in Control Panel or System Settings.
An easy way to change your DNS server is to use a public DNS service such as Google DNS or OpenDNS, which are generally more stable and faster. After changing DNS, restart your network connection or computer for the settings to take effect.
When an error occurs in the DNS cache, you can refresh the DNS information by clearing the cache. Clearing the DNS cache can be done by running a command prompt or terminal and executing a specific refresh command. In Windows, you can use the ipconfig /flushdns command to clear the DNS cache.
After clearing the DNS cache, the computer will query the DNS server again to obtain the IP address of the website, which may solve connection problems caused by outdated or damaged DNS information.
Sometimes, disabling IPv6 can resolve network DNS anomalies. To disable IPv6, set it in the properties of the network adapter and uncheck the IPv6 protocol. The coexistence of IPv4 and IPv6 may sometimes cause network connection and DNS resolution problems, especially when the network environment does not fully support IPv6.
After disabling IPv6, you should restart the network adapter or computer to ensure the changes take effect. If the problem is solved after disabling IPv6, you can continue to use IPv4 until the network environment fully supports IPv6.
The system's hosts file can define the mapping relationship between domain names and IP addresses. Checking the hosts file for incorrect mappings or tampering with malware is one step in troubleshooting DNS issues. The hosts file is usually located in the C:WindowsSystem32driversetc directory of Windows.
If you find unusual entries in the hosts file, you can delete them or restore them to default settings. After changing the hosts file, DNS resolution will be performed based on the updated file contents.
The firewall or anti-virus software may interfere with the normal resolution of DNS. Try turning off the firewall or anti-virus software, and then check whether the network connection returns to normal. Temporarily disabling these security software can help diagnose whether DNS anomalies are caused by security settings.
If the problem is resolved after disabling it, you should check your firewall rules and antivirus software settings to ensure that DNS traffic is not blocked by mistake. After adjusting settings, don't forget to restart your firewall and antivirus software to keep your system safe.
In addition to the general methods mentioned above, there are some other measures that may be helpful in solving DNS problems. For example, updating network adapter drivers or resetting the network stack may also fix network connection issues. These actions are typically accomplished through Device Manager or by running specific network reset commands.
There may also be an operating system issue, and performing a system update or repair installation may help resolve some hidden errors. It's important to always keep your operating system and software up to date and have all critical security updates installed. If you've tried everything and nothing resolves the issue, consider contacting your network service provider or requesting technical support as a last resort.
1. How to solve the problem of DNS exception in the computer network?
DNS anomalies may result in inability to access the Internet or slow loading of web pages. Here are some workarounds:
Clear the local DNS cache: Run the command ipconfig /flushdns (for Windows) or sudo killall -HUP mDNSResponder (for Mac) in a command prompt or terminal to clear the local DNS cache. Change DNS Server: Try changing your DNS server settings, either to use Google's 8.8.8.8 and 8.8.4.4, or to use another reliable public DNS server, such as Cloudflare's 1.1.1.1 and 1.0.0.1. Restart the router: Sometimes the problem is with the router, try restarting the router and wait a few minutes for it to reconnect and assign new DNS servers. Check firewall and security software settings: Some firewalls or security software may block normal DNS resolution. Please check their settings and temporarily disable them for testing.2. Why is there a DNS exception on my computer?
DNS anomalies may be caused by a variety of reasons, including but not limited to the following:
DNS server failure: The DNS server you are using may be faulty or unstable, causing DNS abnormalities. Network connection problems: If your computer cannot connect to the network normally, DNS resolution cannot be performed, resulting in DNS abnormalities. Local DNS cache issues: The local DNS cache may be corrupted or expired, causing DNS resolution errors. Firewall or security software interference: Some firewalls or security software may block normal DNS resolution, causing DNS abnormalities.3. How should I prevent DNS anomalies on my computer?
While DNS anomalies are sometimes difficult to avoid, there are some steps you can take to reduce the likelihood of them happening:
Clear the local DNS cache regularly: Clearing the local DNS cache regularly can avoid DNS anomalies caused by cache problems. Use a reliable DNS server: Choosing to use a reliable public DNS server, such as Google's 8.8.8.8 and 8.8.4.4, can reduce problems caused by DNS server failure. Keep the network connection stable: Make sure your computer can maintain a stable network connection to ensure normal DNS resolution. Configure firewall and security software: Properly configure firewall and security software to allow normal DNS resolution while protecting your computer from potential security threats.I hope this article can help you effectively solve the problem of abnormal computer DNS. If you have any questions, please feel free to leave a message in the comment area, and the editor of Downcodes will try our best to answer them.