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To control account spoofing you can block access to new user registration via VPN.

Enable this feature to prevent access to a website via a Virtual Private Network (VPN) involves employing various methods to detect and block VPN connections. However, it's important to note that such measures may not be foolproof, as users can find ways to bypass them. Here are some common techniques used to prevent access to a website via VPN:

IP Geolocation:

Analyzing the geographical location of the user's IP address can help identify VPN connections. Many VPN servers are located in specific regions, and if a user's IP address is associated with a known VPN server, access can be restricted.

VPN IP Address Blacklisting:

Maintaining a list of known VPN server IP addresses and blocking access from those addresses can be an effective method. However, it requires constant updates as new VPN servers are deployed.

Behavioral Analysis:

Analyzing user behavior patterns, such as the speed and consistency of connections, can help identify suspicious activity that may be indicative of VPN usage.

DNS Filtering:

Monitoring Domain Name System (DNS) requests for known VPN-related domains can be another way to detect and block VPN traffic. This approach targets the infrastructure used by VPN services.

WebRTC Leak Protection:

WebRTC (Web Real-Time Communication) can reveal the user's real IP address even when connected to a VPN. Implementing protection against WebRTC leaks can help maintain anonymity and prevent detection.

Captcha Challenges:

Implementing captcha challenges during the login or access process can add an additional layer of verification, making it more difficult for automated systems, including VPNs, to gain access.

Deep Packet Inspection (DPI):

Analyzing the contents of data packets to detect VPN-specific protocols can be an advanced method. DPI can identify the characteristic signatures of VPN traffic and block access accordingly.

Multiple Authentication Layers:

Implementing multiple layers of authentication, such as device fingerprinting or biometric verification, can make it more challenging for users to access a website via VPN.

It's essential to approach the implementation of VPN blocking features carefully, considering privacy concerns and potential false positives. Users may have legitimate reasons for using VPNs, such as protecting their online privacy, so any VPN-blocking measures should be transparent and justifiable. Additionally, users can find workarounds, so these methods should be seen as deterrents rather than absolute barriers.