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If you are upgrading from Confluence 5.x to Confluence 6.x you will need to modify your reverse proxy (if used) to add Synchrony, which is required for collaborative editing. See Proxy and SSL considerations for more information on the changes you'll need to make to your proxy config.

Once your upgrade is complete, you should access Confluence (via your reverse proxy, not directly) and:

• Head to

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   > Collaborative editing and check the Synchrony status is running. 
• Edit any page to check that your browser can connect to Synchrony.

See Troubleshooting Collaborative Editing for suggested next steps if Synchrony is not running or you see an error in the editor, as you may have a misconfigured reverse proxy.