首先检查凭据，然后在下面的链接中进行检查:

http://social.msdn.microsoft.com/Forums/zh/adodotnetdataproviders/thread/a31656a9-5715-4910-ad96-fa590344a407 [

Check credentials first, next check below link:

http://social.msdn.microsoft.com/Forums/en/adodotnetdataproviders/thread/a31656a9-5715-4910-ad96-fa590344a407[^]

Try command : sp_grantlogin ''NT AUTHORITY\NETWORK SERVICE''

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