Been recently trying to resolve a problem with not being able to create or edit a page in Confluence using IE 11 after a new Confluence installation.
- We had diagnosed the problem as only occurring in IE 11 but it worked just find from Firefox browser.
Problem turned out to be that our standard IE11 setup has a security policy to disable Web Sockets.
Turns out this browser feature is required by Confluence for this proper operation. Though I did not find any documentation stating this requirement.
Posting here in case someone else stumbles into this and wants to avoid thrashing around to figure out what's wrong - as was the case for us. Browsers install with Web Sockets enabled by default, but the corporate policy is to disable it. (https://www.windows-security.org/7015789185d14cf73d8c24fe01231528/turn-off-the-websocket-object)