To see if this is the case, try using the VPN at a public WiFi hotspot or a friend’s house. Without a stable internet connection, your VPN simply won’t work. If your WiFi network isn’t stable or fast enough to support your VPN connection, you’ll get an authentication error when you try to connect. Bear in mind that this may slightly increase the risk of DNS leaks. To test whether this is the problem, try using other DNS servers - turn off the “Only use VPN DNS servers” option in your VPN app settings. This reduces the risk of DNS leaks but sometimes causes connection issues. Try an Alternate DNS Serverīy default, your VPN client will use your VPN provider’s DNS servers. Take note that the quality of your connection may decrease if you switch protocols. You’ll find this option under “Settings” in your VPN app. Because UDP doesn’t do this, it’s faster but can be less reliable. The main difference is that TCP includes error correction, meaning it resends anything which gets corrupted or doesn’t arrive due to connection issues. ![]() Two of the most common protocol types are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). Your VPN should have options like OpenVPN, WireGuard, IKEv2, and other protocols - for example, ExpressVPN has its own fast and secure Lightway protocol. With most VPNs, you can choose which IP protocol to use. Use a Different VPN ProtocolĬhanging your VPN protocol can solve the “VPN Authentication Failed” error. The method for this varies between models, so check your router manual. You can fix this by enabling bridge mode, which will help resolve any network conflicts that could impact your VPN connection. If you’re using two linked routers, this can also cause a problem. A wired connection is much more stable and won’t experience interference from other electronics that can affect WiFi. Try connecting to the router using an Ethernet cable instead of a wireless connection and see if it solves the issue. Sometimes, issues with your WiFi signal strength can prevent the VPN from connecting properly. If you find disabling the software fixes the issue, you’ll need to adjust the settings or change your provider - you can take a look at the top recommended antiviruses here. This isn’t a permanent solution disabling your antivirus software and firewall can leave your computer vulnerable to security threats. You’ll need to do this for public and private networks - this option should be in your firewall settings. Make sure you disable both third-party and built-in firewalls (like the Windows Defender firewall). You can also temporarily disable your antivirus and firewall. Adding your VPN to these whitelists will stop it from being flagged and may solve the VPN authentication error. Your antivirus software and firewall will have the option to choose specific apps that are allowed to access the internet. To find out whether this is the problem, you’ll need to whitelist your VPN and temporarily disable your antivirus software and firewall. If you’re using a firewall or antivirus software, it could be blocking your VPN client. This clears the memory cache and stops any code that isn’t working correctly, letting the VPN start fresh. Like many technical issues, the “VPN Authentication Failed” error can sometimes be solved by rebooting your device. Sometimes, the simplest solutions are the best. These are just a handful of reasons, all of which are simple to fix so you can get connected and protected as soon as possible. Your WiFi connection isn’t stable enough to support your VPN.There are too many simultaneous device connections. ![]() ![]() ![]()
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