The most common cause of this is a problem reaching the Synchrony service.
Check this by going to Admin -> Collaborative editing, and disabling it. You should find that you can now edit pages, but with the old Confluence 5 style editor. If that happens, then we'll need to look at Synchrony.
My instinct would be to look at the proxy server.
I had massive problems getting Synchonry to work over https behind an Apache proxy on 6.0. On 6.2+ it works fine if you follow all the docs, but you still do have to fiddle with the proxy setup for it quite a bit.
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