So, when the port is blocked, the Bitdefender VPN may trigger the error message.
Also, in some cases, when you access the internet from a public Wi-Fi, there is a possibility for the port used by the Bitdefender VPN to be blocked. So, disable the other VPN on your computer. In case more than one VPN is running on your computer, then one VPN may be blocking the other. Another major reason for the Bitdefender error is the usage of dual VPN’s on your computer. To know more about the router firewall, you can refer to the user’s manual of your router. Also, check whether the router to which you are connected has a built-in Firewall because the Firewall on the router can also block the Bitdefender VPN. If the Firewall on your computer is configured in such a way that it does not permit any VPN, then you might face this issue. Another cause for the Bitdefender VPN may be the Firewall installed on your computer. For this, inspect your Ethernet cable or the Wi-Fi router if you are connected wirelessly. 
So, make sure there is no issue with your internet.
Your internet connectivity may be slow, or the connection may not be steady.
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