使用TFS2010, 在追加一个Application-Tier的Specify a Team Foundation Server configuration database步骤时，如果出现错误窗口：
![[Resolved] TF254006: No usable accounts are present in your configuration database. Use TfsConfig accounts /add to add an account and return to this wizard.](http://images.cnblogs.com/likecs_com/holly/WindowsLiveWriter/ResolvedTF254006Nousableaccountsarepres_B205/image_4.png "[Resolved] TF254006: No usable accounts are present in your configuration database. Use TfsConfig accounts /add to add an account and return to this wizard.")
解决方法：
C:\Program Files\Microsoft Team Foundation Server 2010\Tools>TfsConfig.exe accounts /add /accountType:applicationtier /databasename:Tfs_Configuration /sqlinstance:#### /account:#### /password:####
/sqlinstance: 输入DB server name
说明：这里的account需要指定另外一个，不能与已有的重复