Self-signed certificate for ePOS printers

Certain ePOS printers that operate without an IoT system require HTTPS to establish a secure connection with the browser. Since these printers use self-signed certificates, browsers may display a warning when accessing their IP address.

To resolve this, you must generate, export, and import a self-signed certificate.

Overview

Self-signed certificates are used to:

• Secure communication between the browser and the printer

• Eliminate browser security warnings

• Allow proper integration with Odoo POS

Important

• A self-signed certificate should only be generated once. Creating a new one invalidates previously trusted certificates

• Printers connected via an IoT system do not require this setup

• For best results, use Google Chrome during configuration

Note

If your operating system or browser differs from the examples below, search for:

• export SSL certificate <your OS/browser>

• import SSL certificate root authority <your OS/browser>

Generate a self-signed certificate

Steps may vary depending on your system, but the process below uses Google Chrome.

1. Open your browser and enter the printer’s IP address (e.g., https://192.168.1.25)

2. On the security warning page:

   • Click Advanced

   • Select Proceed (unsafe)

3. Access the printer’s admin interface:

   • Go to Advanced Settings → Administrator Login

4. Enter the default password (usually found on the printer)

5. Navigate to:
   Network Security → SSL/TLS → Certificate

6. Under Self-signed Certificate, click Update

7. Set the Common Name to the printer’s IP address only

8. Confirm and wait until the printer finishes processing

Note

Login credentials may vary by model. For example, some Epson printers use:

• Username: epson

• Password: printer serial number

Export the certificate

After generating the certificate:

1. Click the Not secure label in the browser address bar

2. Open Certificate details

3. Go to the Details tab

4. Click Export

Then:

• Save the file with a .crt extension

• Use format: Base64-encoded ASCII

Import the certificate

To trust the certificate on your system:

1. Open browser settings

2. Navigate to Privacy and security → Security

3. Click Manage certificates

Then:

1. Open the certificate manager

2. Click Import

3. Select your .crt file

4. Choose:

   • Trusted Root Certification Authorities

5. Complete the wizard and confirm

Note

Import steps may vary depending on your OS or browser (Chrome, Firefox, etc.).

Verify the connection

To confirm the setup:

1. Open the printer’s IP using HTTPS

   • Example: https://192.168.1.25

2. Check the browser:

• No security warning should appear

• A 🔒 padlock icon should be visible in the address bar

This confirms a secure connection between the browser and the printer.