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Adding Self-Signed Certificates as Trusted Root Certificate

Office clients require add-ins and webpages to come from a trusted and secure location. This generator leverages Browsersync to start a web server, which requires a self-signed certificate. Your workstation will not trust this certificate and thus, the Office client, in which you are running your Office Add-in, will not load your add-in.

When you browse to a site that has an untrusted certificate, the browser will display an error with the certificate:

To fix this, you need to configure your developer workstation to trust the self-signed certificate. The steps for this differ depending on your developer environment (OSX / Windows / Linux). Use these instructions to trust the certificate:

Table of Contents

OS X

Get certificate in Chrome

  1. Start Chrome and do the following:

    1. Open Developer Tools window by using keyboard shortcuts: Cmd + Opt + I.
    2. Click to go to 'security' panel and 'overview' screen.
    3. Click 'View certificate'.

  2. Click and drag the image to your desktop. It looks like a little certificate.

Get certificate file from project directory

You can locate the server.crt file at ~/your_yo_office_project/certs/server.crt

Add certification file to Key Chain Access

  1. Open the Keychain Access utility in OS X.

    1. Select the System option on the left.

    2. Click the lock icon in the upper-left corner to enable changes.

    3. Click the plus button at the bottom and select the localhost.cer file you copied to the desktop.

    4. In the dialog that comes up, click Always Trust.

    5. After localhost gets added to the System keychain, double-click it to open it again.

    6. Expand the Trust section and for the first option, pick Always Trust.

At this point everything has been configured. Quit all browsers, then reopen and try to navigate to the local HTTPS site. The browser should report it as a valid certificate:

Windows

Take the following steps to setup the certificate authority cert for localhost:

  1. Go to {project root}\certs.
  2. Double-click ca.crt, and select Install Certificate.

  1. Select Local Machine and select Next to continue.

  1. Select Place all certificates in the following store and then select Browse.
  2. Select Trusted Root Certification Authorities and then select OK.
  3. Select Next and then Finish.

You now have a self-signed certificate installed on your machine.

Copyright (c) 2017 Microsoft Corporation. All rights reserved.