linux 加入windows domain

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我用命令net rpc join -S PDC -U administrator 把一台linux 系统加到域中
系统提示加域成功,Joined domain 'domainname',但是我用命令测试net rpc testjoin  总是报错
unable to find a suitable server
join to domain "domainname" is not valid
用wbinfo -t检查系统提示如下:
checking the trust secret via RPC calls failed
error code was(0X0)
could not check secret
请问谁知道问题出在什么地方谢谢.