Fixing Skype for Business log in issues on Mac

To fix the Skype for Business (S4B) log in issue on Macs, users will need to complete the following steps:

Step-by-step guide

1. Browse to this web site: https://support.globalsign.com/customer/portal/articles/2084405-intranetssl-root-intermediate-certificates

2. Download the following two certificates (by default they will be saved in your Downloads folder)

   1. GlobalSign Non-Public SHA1 Chain

      1. GlobalSign Non-Public SHA1 CA - G3 SHA1 • RSA • 2048

   2. GlobalSign Non-Public SHA256 Chain

      1. GlobalSign Non-Public SHA256 CA - G3 > SHA256 • RSA • 2048

3. Install both certificates to System Keychain:

   1. In Finder, browse to your Downloads folder, and double click on each one

   2. Your Keychain will open.

   3. Click on the Certificates menu item (left-hand side)

4. Double-click on each certificate (below) and open Trust settings. Under When using this certificate, change to Always trust.

   1. GlobalSign Non-Public SHA1 CA-G3

   2. GlobalSign Non-Public SHA256 CA-G3

5. Close the window to save the preferences. You may be prompted to enter your computer password.

6. Open Skype for Business and log in with your 8-character UWaterloo username (e.g. j25rober) and password.

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