Wireguard VPN handshake successful but no traffic/ ping

 If you've successfully established a WireGuard VPN connection, but you're experiencing issues with traffic or pinging, there could be a few reasons for this problem. Here are some troubleshooting steps to help you resolve the issue:


1. **Check Configuration Files**: Review your WireGuard configuration files on both the server and client. Ensure that they match, including IP addresses, keys, and allowed IPs. A common mistake is misconfigured IPs or incorrect public/private keys.


2. **Firewall Rules**: Make sure your firewall rules on both the server and client allow traffic through the WireGuard interface. You might need to configure your firewall to allow UDP traffic on the WireGuard port (default is 51820).


3. **Routing Configuration**: Check your routing configuration. On the server, make sure it's correctly forwarding traffic. On the client, ensure it's routing traffic through the VPN interface. You may need to add custom routes.


4. **DNS Configuration**: Ensure your DNS settings are correct. You can set a DNS server in your WireGuard configuration file. If DNS isn't working, you might not be able to resolve domain names.


5. **MTU Issues**: If you're unable to ping, it could be related to Maximum Transmission Unit (MTU) issues. Try reducing the MTU value in your WireGuard configuration to see if it resolves the problem. Start with a lower MTU value like 1400 and see if it helps.


6. **Check Key Rotation**: If you've changed keys, make sure the old keys are revoked, and the new keys are correctly distributed.


7. **NAT Configuration**: If your server is behind a NAT, make sure you have configured NAT traversal properly. This usually involves setting the `Endpoint` to your public IP or using a dynamic DNS service if your public IP changes.


8. **Logging**: Check the logs on both the server and client for any error messages or warnings. This can provide valuable insights into what might be going wrong.


9. **Public IP Changes**: If you're using a dynamic public IP on the server, make sure your client configuration is updated with the new IP address.


10. **Check for Conflicting Software**: Ensure that there are no other VPN or routing-related software running on your server or client that might interfere with WireGuard.


11. **Client-Specific Issues**: If the issue is specific to a particular client, ensure that the client's configuration is correct, and there are no local firewall rules or routing issues on the client side.


12. **Test on Different Networks**: If possible, try connecting to the WireGuard VPN from a different network or location. This can help identify if the issue is specific to one network.


By going through these troubleshooting steps, you should be able to diagnose and resolve the issue of a successful WireGuard VPN handshake but no traffic or ping. WireGuard is generally reliable and performs well, but configuration issues or network-specific problems can cause connectivity problems.

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