Not sure what this has to do with Atlassian - you'll need to tell us why you think it does to get much help here.
(At a guess though - 405 as an error from subversion usually means that you've tried to do something you're not supposed to. The usual culprit when I do it is trying to add a new directory which already exists)
(they're not as lucky to be a Jira Admin like you!) It's a human thing actually, isn't it? Specially in "provider—consumer" relationships, we seem to blame the end-user quite often: The product...
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