重裝了下系統，然後用SVN的時候發現能checkout能update就是不能commit，提示用戶權限無法認證，搞了好久，重裝過，重啓等等方法，最後發現是由於svn的URL的問題，有問題時用的svn://協議，這種協議下只讀，所以要改成https://協議，然後就搞定了！！
Commit failed (details follow):
Authorization failed
這是google出來的答案，好難找，幾乎沒有人遇到類似的問題。
http://rnm1978.wordpress.com/2010/09/21/tortoisesvn-doesnt-prompt-for-authentication/
For some reason I’d been merrily connecting using the svn:// protocol, which worked for read-only (I think our SVN server’s configured for anonymous read-only), but then barfed on write-attempts.
Using https:// protocol, correctly prompted me to authenticate on connection.