运行sp_xp_cmdshell_proxy_account 存储过程可能出现以下几种错误：
Msg 15137, Level 16, State 1, Procedure sp_xp_cmdshell_proxy_account, Line 1
An error occurred during the execution of sp_xp_cmdshell_proxy_account.
Possible reasons: the provided account was invalid or
the '##xp_cmdshell_proxy_account##' credential could not be created. Error code: '0'.
---用户名称错误
Msg 15137, Level 16, State 1, Procedure sp_xp_cmdshell_proxy_account, Line 1
An error occurred during the execution of sp_xp_cmdshell_proxy_account.
Possible reasons: the provided account was invalid or
the '##xp_cmdshell_proxy_account##' credential could not be created. Error code: '1326'.\
--密码错误
Msg 15137, Level 16, State 1, Procedure sp_xp_cmdshell_proxy_account, Line 1
An error occurred during the execution of sp_xp_cmdshell_proxy_account.
Possible reasons: the provided account was invalid or
the '##xp_cmdshell_proxy_account##' credential could not be created. Error code: '5'.
--access deny,用户缺少权限，无法调用底层dll。此出现在vista或windows 2008。禁用UAC或者以administrator权限运行可解决这个问题