putty Access Denied
用putty的保存密码版，总是提示Access Denied，然后又顺利登录。看着很不爽，google了一下，找到了原因。
1， PuTTY tries several authentication methods in a row, which might cause these messages:
* GSSAPI (only if your system and the server have it enabled)
* Public key (only if you have a key loaded)
* Password
2， 发现是GSSAPI出了问题，取消了putty的GSSAPI认证。一切ok。