远程桌面连接不到服务器上的一个原因: 系统日期问题。

系统提示如下：

remote desktop cannot connect to the remote computer because the authentication certificate received from the remote computer is expired or invalid.
in some cases, this error might also be caused by a large time discrepancy between the client and server computers.

一个原因: 系统日期问题，我本地日期调到2011年了，和系统日期不一致，把本地日期和服务器日期和谐一下就好了。