How to fix the TLS key negotiation failure issue with OpenVPN?
Please attempt the following solutions in order;
- Your ISP or national firewall may be filtering out OpenVPN packets on UDP (port 53). Connect to one of the TCP mode servers (right click the iVPN tray icon and select a server which ends with 'TCP mode'). The 'TCP mode' servers use port 443 which is very unlikely to be blocked as it a standard port used for secure web services.
- Your router or a software firewall on your PC may be filtering connections on port 53. Temporarily disable your firewall to check if your firewall is blocking the traffic. Some customers have found it necessary to completely uninstall the firewall software followed by connecting and reinstallation.
- In rare cases the windows firewall may be blocking access to the openvpn.exe binary. Whitelist (add it to the "Exceptions" list) it for OpenVPN to work.
If the above solutions do not work then it is likely that you are located on a network which is blocking access to VPN technology. You can try our various existing ports following instructions found in this troubleshooting article. If that still does not work, you should consider using our extras such as TOR's obfsproxy or OpenVPN's ECC+XOR to scramble your traffic.