How to Fix VPN authentication failed error on Windows 10/Mac/iOS? (2020 Edition/Tips)

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Here are some steps on how to fix VPN authentication failed error:

1. **Check, test and change your internet connection.**
Make sure that you are connected to the internet and that you have a strong signal. You can try restarting your router or modem to see if that fixes the issue. Note that some ISP does have the ability to detect then block VPN traffics.

2. **Check your VPN settings.**
Make sure that you have entered the correct username and password for your VPN. You can also try resetting your VPN settings to their defaults.

3. **Check your VPN server.**
Make sure that the VPN server you are trying to connect to is up and running. You can try connecting to a different server to see if that fixes the issue.

4. **Check your firewall or antivirus software.**
Your firewall or antivirus software may be blocking your VPN connection. You can try disabling your firewall or antivirus software to see if that fixes the issue.

5. **Contact your VPN provider.**
If you have tried all of the above steps and you are still getting the error, you can contact your VPN provider for help. They will be able to troubleshoot the issue and help you get connected.

Here are some additional tips that might help you fix the VPN authentication failed error:

* Make sure that you are using the latest version of your VPN software.
* Try connecting to your VPN from a different device.
* Try connecting to your VPN from a different location.
* Try restarting your computer.
* Try reinstalling your VPN software.
* Contact your VPN provider for help.

Editor’s Note: This "VPN authentication failed" troubleshooting video guide was originally uploaded in December 24, 2018 & has been just re-updated for freshness, accuracy, & comprehensiveness. See/review the following to-do list of 2020:

1. Check out your installed antivirus & firewall and, review the settings you set up.
Note: you may need to reset your security program.
2. Disable your security app(s). Moreover, you may also consider performing the removal of that useless resource-hogging baggage* (* unused/unknown programs in your system)
3. Check out your allowance under your VPN account or existing VPN Subscription. For example, With a single subscription, you can connect 3 devices to the VPN server at the same time, regardless of platform (including virtual machines such as VMware Workstation).
4. Check out your VPN service (system performance) and/or (specific) server status (in your own area).
Or, try connecting a different VPN Server.
5. Change or (re-)check out your VPN username & password.
Hints: 1) Sometimes, signing out then re-logging in your VPN client does the trick. 2) Contact your VPN service provider support team and see if there was internet censorship.
6. Reinstall your VPN client using the latest version of official download or the beta build, as admin.
7. For advanced Windows users, perform a Clean boot.
8. Consider switching to a different (Premium, NOT free) VPN service provider.
9. Potential hardware issues:
Reboot Your Computer.
Reboot your router (if any) several times.
Try connecting via Ethernet (a Wired Connection). Also, try connecting on a different network.
10. Change IP Protocols or a Different VPN Protocol like using UDP instead.
11. Change DNS server in Windows or, in your VPN client if allowed.
(1/6/2020 Added:) 12. If you're using an iOS device with a Linux/OpenSWAN VPN server, CHAP must be enabled on your server. Otherwise, your iOS devices must be rebooted in order to reconnect to the server.
(1/6/2020 Added:) 13. For OpenVPN users, plz see openvpn.net/vpn-server-resources/troubleshootin… "Troubleshooting Authentication Related Problems". Learn more?

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