Problem

After opening a collaborative editing session in Confluence 6.0.x in Safari you see "Loading the editor's taking longer than usual. Give it a few moments, then refresh your page if it still doesn't load. Speak to your Confluence admin if that doesn't fix it." as shown below:

You can, however, successfully edit pages in another browser like Chrome or Firefox. 

Diagnosis

Environment

• macOS with Safari
• Self-signed SSL certificate (or a certificate without a valid root CA chain) 

Diagnostic Steps

1. Enable the Develop menu in Safari
   1. Open Safari > Preferences
   2. Click Advanced tab
   3. Tick the box next to 'Show Develop menu in menu bar'
2. Open the Console
   1. Click Develop > Show Javascript Console

If you are affected by this issue you will see the following error messages in the Safari console:

• WebSocket network error: OSStatus Error -9807: Invalid certificate chain

Cause

Safari does not support, most likely due to a bug, WebSocket connections that use a self-signed certificate. 

Workaround

Enable XHR Fallback

1. Stop Confluence

2. Add the following to the Confluence system properties (following the steps for your operating system from Configuring System Properties):

   -Dsynchrony.enable.xhr.fallback=true

3. Start Confluence

Resolution

Switch to a certificate provided by a certifying authority

• See Running Confluence Over SSL or HTTPS for more information