OpenVPN is a popular open-source software that allows you to create a secure and private network connection over the internet. It uses SSL/TLS protocols to encrypt data and provides a reliable and secure way to access resources on a remote network. In order to establish a connection to an OpenVPN server, you need to obtain a server certificate on the client. In this article, we will guide you through the process of obtaining an OpenVPN server certificate on the client.
Step 1: Generate a Certificate Signing Request (CSR)
The first step in obtaining an OpenVPN server certificate on the client is to generate a Certificate Signing Request (CSR). This CSR will be used to request a certificate from a Certificate Authority (CA). To generate the CSR, you can use the OpenSSL command-line tool.
openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out server.csr
This command will generate a private key (server.key) and a CSR (server.csr) file. Make sure to securely store the private key as it will be used to authenticate the server.
Step 2: Submit the CSR to a Certificate Authority
Once you have generated the CSR, you need to submit it to a Certificate Authority (CA) to obtain a server certificate. There are many CAs available, both free and paid. Some popular CAs include Let's Encrypt, Comodo, and Symantec. Choose a CA that suits your needs and follow their instructions to submit the CSR.
Step 3: Receive and Install the Server Certificate
After submitting the CSR, you will receive a server certificate from the Certificate Authority. This certificate is a digital file that contains information about the server and is used to establish a secure connection. Once you receive the certificate, you need to install it on the client machine.
To install the server certificate, you need to copy the certificate file to the appropriate directory on the client machine. The exact location may vary depending on the operating system and OpenVPN configuration.
For example, on a Linux system, you can copy the certificate file to the /etc/openvpn/ directory:
sudo cp server.crt /etc/openvpn/
On a Windows system, you can copy the certificate file to the C:\Program Files\OpenVPN\config\ directory.
Step 4: Update the OpenVPN Configuration
Once the server certificate is installed, you need to update the OpenVPN configuration file to use the new certificate. The configuration file is usually located in the /etc/openvpn/ directory on Linux systems and in the C:\Program Files\OpenVPN\config\ directory on Windows systems.
Open the configuration file in a text editor and locate the line that specifies the path to the server certificate. Update the path to point to the new certificate file:
cert server.crt
Save the configuration file and exit the text editor.
Step 5: Restart the OpenVPN Service
After updating the configuration file, you need to restart the OpenVPN service for the changes to take effect. The method to restart the service may vary depending on the operating system.
On a Linux system, you can use the following command to restart the OpenVPN service:
sudo systemctl restart openvpn
On a Windows system, you can restart the service from the Services management console.
Step 6: Test the Connection
Once the OpenVPN service is restarted, you can test the connection to the server. Open the OpenVPN client software and try to establish a connection to the server. If everything is configured correctly, you should be able to establish a secure connection to the server.
If you encounter any issues during the connection process, make sure to double-check the server certificate and OpenVPN configuration for any errors or typos.
That's it! You have successfully obtained an OpenVPN server certificate on the client. Now you can securely connect to the OpenVPN server and access resources on the remote network.
References
| Source | Link |
|---|---|
| OpenVPN | https://openvpn.net/ |
| Let's Encrypt | https://letsencrypt.org/ |
| Comodo | https://www.comodo.com/ |
| Symantec | https://www.symantec.com/ |