There can be many reasons for disconnections while using a VPN, here are some possible reasons:

Network connection problems: A VPN connection requires a stable network connection, and if your network connection is unstable, it may cause the VPN connection to be interrupted.

Issues with VPN service providers: If you use a VPN service provider that is blocked or restricted in China, it may cause unstable or inaccessible VPN connections.

Firewall or Internet Blocking: The Chinese government has blocked and restricted VPNs, which may cause the VPN connection to drop or become impossible to connect. Sometimes, even if you successfully connect to the VPN, you will find that you cannot access certain websites or applications.

Blocked VPN protocols: Some VPN protocols (e.g. PPTP, L2TP) are blocked in China, while others (e.g. OpenVPN) may still be available. If you’re using a blocked protocol, your VPN connection may be unstable or impossible to connect.

High VPN server load: If you are connected to a VPN server that is heavily loaded, it may cause your VPN connection to become slow or interrupted.

If you often experience connection problems when using VPN, you can try to use another anti-blocking VPN service provider, change the VPN protocol, change the server you connect to, upgrade your Internet connection or try using another network.

For the fourth item above, which is also the most likely situation, we list the following common blocking situations for the fourth item:

The blocking and identification of VPNs and circumvention protocols by the Chinese government are constantly changing. The following are some circumvention protocols that may be identified and blocked:

PPTP protocol: PPTP protocol is an old VPN protocol, which uses a 128-bit encryption algorithm. Due to its poor security, it is blocked in China.

L2TP/IPsec protocol: L2TP/IPsec is a relatively secure VPN protocol that uses a 256-bit encryption algorithm, but it is also blocked in China.

SSTP protocol: SSTP is a relatively new VPN protocol, which uses the SSL protocol for encrypted communication, and it is still available in China.

OpenVPN protocol: OpenVPN is an open source VPN protocol that uses a 256-bit encryption algorithm and is still available in China.

The more easily identifiable protocols such as ss ssr are also hardest hit, and this situation will become more serious after 2020.

It should be noted that the availability of these protocols in China may change at any time, so when using a VPN, you need to keep an eye on policy changes and choose the latest reliable airport or firewall protocol.

BatVPN can provide the latest anti-blocking protocol, minimize the blockage of the firewall, and reduce the impact on your normal Internet access.