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Fix: VPN Connection User Authentication Failed Mac

The VPN Connection User Authentication Failed Mac issue is experienced by most of the Mac computer users while creating a new user account. Some of the possible ways to solve this issue are discussed below.

  • If the VPN connection user authentication failed issue has occurred while adding a new account, then navigate to your Mac computer’s Library section.
  • Select the Preferences option followed by System Configuration.
  • Now, you can find the list of files that hold important data about your network setting and the VPN connection.
  • Copy the new user or account folder and paste it to your current user account.
  • This method will resolve the VPN Connection user authentication failed error on the Mac device.
Vpn Connection User Authentication Failed Mac

Disable or turn on your Mac system’s firewall option

  • A firewall is used to scan each data that is sent from or received on your Mac computer.
  • Sometimes, your Mac computer’s firewall might be blocking the transmission.
  • To disable or turn off the firewall option, click the Apple menu.
  • Select the System Preferences option followed by Security & Privacy.
  • Now, the Security & Privacy window will open.
  • Click the Firewall tab.
  • Locate the Firewall: Off option and disable it by clicking the radio button next to it.
  • Now, your Mac computer’s firewall option is disabled.

Try connecting devices using an Ethernet cable

  • If you have connected the modem or router to your Mac computer wirelessly, then connect them directly using an Ethernet cable.
  • If you have connected one router behind the other, then there is a chance for the double NAT problem to occur.
  • In this situation, enable the bridge mode to help two routers to work together.

Change TCP or UDP protocol

  • Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are the two IP protocols used for connectivity.
  • Out of these, the TCP protocol is used across the internet. It also has an error correction feature. So if there is a connectivity problem, then TCP tries to solve it by itself.
  • UDP is faster when compared to TCP. But, it is not used as much as TCP.
  • To change the VPN protocol on your Mac computer, read and proceed with the guidelines given below.
  • Navigate to your Mac computer’s VPN settings section.
  • Locate your current server and click the cogwheel icon located beside it.
  • Choose the UDP or TCP option based on your preferences.
  • Click the Apply button.

Identify the number of devices connected

  • If the number of connected devices to your network is high, then there is a chance for the VPN connection user authentication failed issue to occur on your Mac computer.

Check your VPN

  • Make sure that your VPN connection is stable.
  • Some of the VPNs recommended for Mac computers are IPVanish, ExpressVPN, VyprVPN, and NordVPN.

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