How to Install Custom Domain Certificates

Download the certificate file here:
📥 Download Certificate

Linux (Ubuntu/Debian-based)

1. Copy your custom certificate (e.g., rotas.ch_at_ionos_com_ssl_certificate.cer) to /usr/local/share/ca-certificates/:

   sudo cp rotas.ch_at_ionos_com_ssl_certificate.cer /usr/local/share/ca-certificates/

2. Update the certificates:

   sudo update-ca-certificates

3. Restart any services that rely on SSL.

Windows

1. Double-click the certificate file (.crt or .cer).
2. Click Install Certificate.
3. Choose Local Machine (you may need admin rights).
4. Select Place all certificates in the following store.
5. Click Browse and choose Trusted Root Certification Authorities.
6. Click Next and then Finish.
7. Restart applications to apply changes.

macOS

1. Double-click the certificate file (.crt or .cer).
2. It opens in Keychain Access.
3. Select System or System Roots keychain.
4. Click Always Trust when prompted.
5. Or right-click the cert → Get Info → Expand Trust → Set to Always Trust.
6. You may need to enter your admin password.
7. Restart apps like Safari or Chrome.

Android

1. Copy the certificate files to your device (rename it to ca-cert.crt if needed).
2. On the device, open Settings → Security → Encryption & credentials.
3. Tap Install a certificate → choose CA certificate.
4. Select the file and confirm installation.
5. For newer Android versions, this installs for system-wide use only if the device is rooted. Otherwise, it applies to user apps (not browsers).

Note: Some browsers like Chrome on Android may ignore user-installed CAs unless rooted.

Download both certificates file here:
📥 Download Intermediate Certificate 1
📥 Download Intermediate Certificate 2

Google Chrome

Chrome uses the system's certificate store:

• Windows: Use the method above (Windows section).
• Linux: Use the method above (Linux section).
• Restart Chrome after installing the certificate.

Mozilla Firefox

1. Open Firefox and go to about:preferences#privacy.
2. Scroll down to Certificates and click View Certificates.
3. In the Authorities tab, click Import.
4. Select your intermediate certificate file and check the box:
   • Trust this CA to identify websites.
5. Click OK to import and save.

Tips

• Ensure the certificate file has the correct extension (.crt, .pem, or .cer).
• Use a trusted CA or generate your own using tools like OpenSSL for internal use.
• Always restart apps or services that depend on SSL after installation.