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Optimum: Domain Not Found (7 Ways To Fix)

optimum domain not found fixed

Domain not found or DNS server not responding is an error message you receive when your browser fails to establish the internet connection. Usually, domain-related errors are caused by problems on the user end. So, you have encountered this error on your Optimum Altice Optimum Wi-Fi connection, there are good chances it’s not the provider’s fault.

Most of the time, the cause of the problem is misconfigured DNS settings or an outdated browser. Both can attribute to a temporary server outage hence, rendering DNS unavailability. It’s possible to resolve this problem by switching browsers. In other cases, you might to some tweaks with the DNS settings. Let’s learn how to resolve the “Optimum domain not found” issue:

1: Make Sure You Have Entered the Right URL

Just to stay on the save side, make sure the URL or domain name you have entered is correct. For that, simply hit enter and shift at once. You will be taken to the right domain name automatically.

2: Switch to a Different Browser

Another simple approach to resolve this issue is to switch to a different web browser. It’s possible your current internet browser needs updating. Let’s say your default browser is Google Chrome or Safari. Switch to Microsoft Edge or Firefox to access the website.

If switching browsers works for you, this means you need to update your default browser. Look for updates. You can also uninstall and then reinstall it. However, if you still receive the error “Optimum Domain not Found” upon switching browsers, the error is caused by something else.

3: Restart the Router

There is no error that can’t be fixed by restarting a router (almost). It’s like refreshing your router and making it flush all the cache that could be the cause of the domain error.

Restarting is a quick proper. Most modems have a power button that makes it easier to turn off the power quickly and then turn it on without any fuss. Your modem will re-establish its connection and once it does, check if you are able to access the web from your browser.

Sometimes, simply restarting the router is not enough. You will have to reboot the thing entirely and wait for 30 seconds before plugging it back in again.

4: Start Your PC in Safe Mode

If your PC’s operating system is not functioning properly, you are likely to see the “Optimum Domain not found.”

To fix this, you may want to try booting your Windows in safe mode and see if this issue resolves. Follow these steps to start your windows in safe mode:

  1. Click on the Windows button
  2. Go to the power icon
  3. Press the hold key and click the “Restart” button
  4. A window will open up.
  5. Hit troubleshoot >> advanced
  6. Choose “startup settings”
  7. Hit “restart’
  8. Press 4 or 5 for enabling safe mode
  9. This will make your PC restart in safe mode

Once your Windows is in Safe mode, enter the domain again and this should solve the issue. If it doesn’t work, move to the next remedy.

5: Change the System Preferences

Things are going to get technical here.

In this step, you will have to change the DNS server settings so make sure you know what you are doing. The goal is to change the default DNS server settings. Once you have done that, apply the settings and restart your device. This will eliminate the domain error and probably other error codes related to the domain too.

6: Flush the Cache and Reset the IP

It’s possible your DNS needs some cleaning before you probably connect to the Internet. If you are doing that, you might want to reset the IP as well. Follow these steps:

  1. Type cmd in your search bar
  2. Choose the command prompt app
  3. Type in ipconfig/flushdns
  4. Press enter

It will take a few seconds for the process to complete. Once it’s over, it will display the message that your DNS cache has been flushed successfully.

  1. Then, press these commands for resetting the IP:
  • ipconfig /registerdns
  • ipconfig /release
  • ipconfig /renew

7: Disable the IPv6

IPv6 is an internet protocol that helps you route the traffic between the network and the Internet. This protocol could be the reason behind the domain error.

Disabling the IPV6 can make it go away. To disable it, follow these steps:

  1. Open the network connections control panel
  2. Right-click on your connection
  3. From the properties, go to the networking tab
  4. Find the IPv6 protocol
  5. If it’s selected, uncheck the box
  6. Hit Ok

Refresh your browser and try to connect to the Internet.

8: Disable the Anti-Virus and Firewall

Another thing you can try is to deactivate the firewall temporarily. Firewall and antivirus are meant to safeguard our devices but sometimes, they can interfere with the network connections.  Check if they are disrupting your connection.

To disable the firewall, follow these steps:

  1. Go to control panel
  2. Choose update and security
  3. Hit windows security
  4. Select “Virus and threat protection”
  5. Go to “manage settings”
  6. Disable the firewall or antivirus

After you have deactivated the firewall, reconnect to the Internet or visiting that domain again. If this solves the problem, you might want to try a different antivirus product or reconfigure the settings of your current one. In any case, it’s imperative to reactivate the firewall when you have solved this problem.

Final Advice

When you try to visit a website via your Optimum Internet and you get the message that the domain cannot be found, try these remedies and this should fix the problem. The error is not really at the ISPs end so these remedies should fix everything.

However, if nothing seems to be work, you can contact Optimum’s customer support. Explain the problem to the agent and they will connect you with someone from the technical support department where issues related to Optimum port forwarding and domain errors are addressed often.

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