How to delete and recreate the bitBAPI certificate
Open Server Manager
Wait until you see IIS listed.
Select Internet Information Services
Click to highlight the server and then double-click Server Certificates
Right-mouse click the bitBAPI certificate and click remove
Select Yes at the Confirm Remove dialog
Select Create Self-Signed Certificate
Enter bitBAPI as the friendly name and select Personal from the dropdown and select Ok
The new certificate is created and shown in the certificate list
Click on the bitBAPI website
Select Edit under Site Bindings, Edit bindings, and select the bitBAPI SSL certificate. Click OK
Click Restart under Manage Website
Click Browse *.443 (https)
Internet Explorer will open
You should see a webpage with a message saying API Running. You might be prompted that this is a self-signed cert - select continue.