Hi Charlie, the Web Application Firewall had its own file size upload restrictions on it that were more strict than the Moodle/Apache/PHP settings, which it was imposing. I had no idea the WAF was doing this, so hadn't thought to ask, but that's where the issue was and the firewall guys fixed that for us (or, we could say, "un-broke" it).
General help
"Error connecting to server" restoring a course.
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