Fixing the "Authentication Protocol" Error on Your VPN Connection
Learn how to troubleshoot and resolve the common Authentication Protocol error on your VPN connection effectively.
Written by Joe Howard
Updated at February 11th, 2025
A common error when first connecting to the corporate VPN is that the “connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer”. This article gives instructions for fixing that error.
Instructions
Search for and open “Network Connections” from the Start Menu
Locate and right-click your VPN connection (likely called “Eccovia”)
Select “Properties”
Click on the “Security” tab
Change the “Data Encryption” dropdown
If it’s set to “Maximum strength” set it to “Require encryption”
If it’s set to “Require encryption” set it to “Maximum strength”
