Troubleshooting Not Accessing Server One WireGuard Interface with Another WireGuard Interface on ProtonVPN

Troubleshooting Not Accessing Server One WireGuard Interface with Another WireGuard Interface on ProtonVPN

This article is focused on helping users who are having issues when using ProtonVPN via WireGuard on an Ubuntu 22.04 server. Specifically, it addresses the problem of not being able to access Server One WireGuard interface with another WireGuard interface from ProtonVPN configurations connecting different locations.

WireGuard and ProtonVPN Overview

WireGuard is a simple, fast, and modern VPN that utilizes state-of-the-art cryptography. ProtonVPN is a security-focused VPN service that provides end-to-end encryption through its applications.

Troubleshooting Steps

Step 1: Verify WireGuard Interfaces

First, ensure that the WireGuard interfaces are properly set up for both Server One and the secondary ProtonVPN-generated WireGuard configuration. Double-check the interface names, private and public keys, allowed IPs, and endpoint settings for both configurations.

# Sample WireGuard config file
[Interface]
PrivateKey = yAnz+3hDc2AOaKKs6sMjwTC1X6jyLHcNiAfjUvt/16E=
Address = 10.0.0.1/24

[Peer]
PublicKey = RKcskv38SwLr8v8xPyPjjh3vSzzDyYyiJGiAb7BfZ4s=
Endpoint = [server-address]:51820
AllowedIPs = 10.0.0.2/32

Step 2: IP Address Conflicts

Another possible issue is IP address conflicts between the two WireGuard configurations. Verify that there are no overlapping IP addresses specified in both WireGuard config files.

Step 3: Routing and Firewall Settings

Proper routing and firewall settings are crucial for both WireGuard and ProtonVPN connections to work correctly. Double-check that the routing and firewall settings for Server One and the secondary ProtonVPN-generated WireGuard configuration are configured properly.

# Sample iptables rules
iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE
iptables -A INPUT -i wg0 -j ACCEPT
iptables -A FORWARD -i wg0 -j ACCEPT
iptables -A OUTPUT -o wg0 -j ACCEPT

Step 4: Disable WireGuard Interfaces Sequentially

To identify any conflicts or connection issues between the two WireGuard interfaces, try disabling each one sequentially while testing the connectivity between Server One and the secondary ProtonVPN-generated WireGuard configuration.

Additional Troubleshooting Resources

• WireGuard Documentation [1]
• ProtonVPN Knowledge Base [2]
• Ubuntu WireGuard Guide [3]

References

1. WireGuard Documentation. wireguard.com
2. ProtonVPN Knowledge ```