VPN Error Code 504

My VPN keeps turning off and is replaced by an "upgrade" add-----when I searched it said error code 504

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Try exiting out of VPN (in Windows) right-click the system tray icon, Exit. Then from the main Bitdefender app, click on VPN from Quick launch panel, or go into Privacy -> VPN/Open VPN and see if you still get an error code.

Scott

Alexandru_BD

Hello @canskibik and welcome to the Community!

There are a few general causes for connection errors encountered by Bitdefender VPN:

You are not connected to the Internet and can’t access the Internet via Wi-Fi or Ethernet cable. Make sure you have Internet access before using Bitdefender VPN.
A strictly configured firewall is preventing VPN connectivity (e.g. 3rd party firewall software, router’s built-in firewall). If you are not sure if your router comes with a dedicated firewall or how to turn it off please refer to its manual, contact the manufacturer or your ISP.
Another VPN or Proxy is running when you try to connect. In this case, disable the other VPN/Proxy solution.
You’re on a public Wi-Fi such as work, school, airport, etc. which may have blocked the ports required by Bitdefender VPN. You need to contact the network administrator to try and change their firewall settings.
The port used for the VPN connection is closed. Depending on the device you’re currently using, the port 443 UDP must be open.

In addition to the general possible causes mentioned above, to find out exactly what is causing this particular error, we need the VPN app version and OS.

Regards