I've got a Confluence setup running behind an IIS8 proxy doing SSL. Everything works except for one thing.
When I try to copy a few paragraphs or two of text, attempt to copy a table, or attempt to insert a table larger then about 8x8, the Collaborative Editing fails and the text on the bottom bar goes from "Ready to Go" or "Changes Saved" to "Can't save changes". It will then sit there until you cancel editing, discard your changes, and reopen the editor.
Copying and Pasting smaller blocks of text or inserting smaller tables works as expected. There is some kind of threshold around 3,500 characters of text is the difference between working and breaking.
The Environment is Windows 2012 R2 with IIS8 with SSL running and Confluence 6.1.0. This happens in both IE and Chrome, I have not tested Firefox. There are no errors in any Confluence logs, IIS8 logs, or even in the developer console in Chrome.
If I turn off the proxy and go to Confluence 6.1.0 directly, everything works fine. I also have an Apache install doing the same thing and it also works fine. This problem appears limited to IIS8 doing WebSockets.
My best guess is that there is a setting in IIS8 that is limiting the amount of data it will proxy. I just can't find that setting.
Settings I've looked at include:
I'm at a loss as to what setting is chopping off the payload and putting the editor into a state that the page has to be reloaded. Any suggestions would be greatly appreciated.
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