TLS Key Negotiation Timeout in Docker OpenVPN: Solution
When running OpenVPN (also known as Docker OpenVPN or "DockOvpn") using a docker-compose.yaml file, you may encounter issues related to TLS key negotiation timeouts. This article will provide a detailed explanation of the problem and offer a solution to resolve it.
Understanding TLS Key Negotiation Timeout
Transport Layer Security (TLS) is a cryptographic protocol used to provide secure communication over a computer network. In the context of OpenVPN, TLS is used for key negotiation between the client and server. TLS key negotiation timeout occurs when the client and server fail to negotiate a TLS key within the allowed timeframe.
Symptoms of TLS Key Negotiation Timeout
When a TLS key negotiation timeout occurs, the client may display an error message similar to the following:
TLS key negotiation failed to occur within 60 seconds (check your network connectivity)Solution: Increase TLS Timeout
To resolve the TLS key negotiation timeout issue, you can increase the timeout value in the OpenVPN configuration file. By default, the timeout value is set to 60 seconds. You can increase this value to a higher value, such as 120 seconds, to give the client and server more time to negotiate a TLS key.
Step 1: Modify the OpenVPN Configuration File
To modify the OpenVPN configuration file, you will need to locate the file and open it in a text editor. The configuration file may be named ovpn.conf or something similar.
# Example OpenVPN configuration file
proto udp
port 1194
dev tun
ca ca.crt
cert client.crt
key client.key
tls-auth ta.key 1
cipher AES-256-CBC
auth SHA256
user nobody
group nogroup
persist-key
persist-tun
remote-cert-tls server
verb 3
Step 2: Add the tls-timeout Option
To increase the TLS timeout value, add the tls-timeout option to the OpenVPN configuration file. The value after the option specifies the timeout value in seconds. For example, to set the timeout value to 120 seconds, add the following line:
tls-timeout 120
Step 3: Save and Close the Configuration File
After modifying the OpenVPN configuration file, save and close the file. The changes will take effect the next time the OpenVPN client connects to the server.
TLS key negotiation timeouts can occur when running OpenVPN using a docker-compose.yaml file. To resolve this issue, you can increase the TLS timeout value in the OpenVPN configuration file. This can be done by adding the tls-timeout option to the configuration file and specifying a higher timeout value in seconds.
References
- OpenVPN: https://openvpn.net/
- Docker OpenVPN: https://github.com/kylemanna/docker-openvpn
- TLS Key Negotiation Timeout: