Tag Archives: VPN


Unifi VPN – L2TP Connection Attempt Failed After Installing KB5009543

Microsoft released a path KB5009543 during Patch Tuesday of 2022 which is resulting in Unifi VPN connections presenting you with the message, L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer. Other vendors besides Unifi like, Sonicwall, Ciso Meraki and WatchGuard Firewalls are experiencing the […]