Obtaining a StartCom Certificate

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This article is deprecated and not valid for current versions of the Mumble client or the Mumble server

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StartCom is terminating business on 2018-01-01, and their certificates are already not trusted by major browsers after several incidents. More information is available here.

The following guide describes how to obtain a free StartCom Class 1 S/MIME certificate using Firefox 3.5. StartCom unfortunately does not support Internet Explorer 8 at this time. As of 2014 Chrome has been tested and works just fine with StartCom. All images are click-able, if more information is needed.

  1. Go to https://www.startssl.com and click the top right button.
    Mumble StartCom ff 1 small.jpg
  2. Click the sign-up button.
    Mumble StartCom ff 2 small.jpg
  3. Fill in your details. Press continue. Now there could be a slight wait while they manually check your details. You really need to provide your actual address and phone number in order for this part of the process to go smooth. StartCom review the applications manually, but rather quickly under normal circumstances. If all goes well you should get a confirmation code to the email address you entered.
    Mumble StartCom ff 3 small.jpg
  4. Enter the registration code you get in your mail.
    Mumble StartCom ff 4 enter code small.jpg
  5. Wait for an activation link to arrive in your mailbox, and click the link in the mail and enter the code that's provided in this new mail.
    The mail should look something like this
    Mumble StartCom ff email.jpg


  1. Now choose to create your certificate. Generate Private Key. The default is High grade, and you should stick with that.
    Mumble StartCom ff 6 generate key small.jpg
  2. The certificate will be created and stored in the browser.
    Mumble StartCom ff 7 install key small.jpg
    Mumble StartCom ff 8.jpg
  3. To export the certificate select "Preferences" -> "Advanced" -> "Encryption" -> "View Certificates", choose the "Your Certificates" tab and locate your certificate from the list. The certificate will be listed under StartCom Ltd. with "StartCom Free Certificate Member" as its name if this is your first one. Select the certificate and click on "Backup", choose a name for this backup file, provide a password and save it at a known location.
    Export ff 1.jpg Export ff 2.jpg Export ff 3.jpg

Importing a certificate from file into Mumble

  1. Select Configure -> Certificate Wizard
    Import mumble 1.jpg
  2. Select import certificate. Click Next
  3. Locate the certificate file. It should end in .p12 or .pfx depending on which browser exported the certificate.
  4. Enter the password for the certificate
  5. The certificate details should now be filled in. Make sure that it is the correct certificate. Click next.
    Import mumble 2.jpg
  6. Confirm that you want to change your certificate by pressing next.
    Import mumble 3.jpg
  7. Done! Press finish to close the guide.
    Import mumble 4.jpg