remove the prompt when use vista to connect to other os older than vista.-优快云博客

本文介绍如何通过修改注册表项AuthenticationLevelOverride来移除Windows Vista远程桌面连接时出现的认证检查提示。该设置允许用户选择三种不同的认证级别：不认证、尝试认证及必须认证。将值设为0可完全禁用提示。

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Set the authentication level value to one of the following values:

•	0 This value corresponds to "No authentication."
•	1 This value corresponds to "Require authentication."
•	2 This value corresponds to "Attempt authentication."

I experimented and found that 2 is the default now. I tested the 3 modes and found that:

0 -> Doesn't prompt. Yah!
1 -> Gives a similar message but doesn't allow me to continue. This is the strictest.
2 -> Gives the message but allows me to accept and continue.

In my case, I don't even want the prompt so I set AuthenticationLevelOverride to 0 and I'm able to log into my Remote Desktop sessions without that extra prompt.

Warning: this is a decrease in security so should only be changed if you are aware of the what and why of this change.

In summary, if you want to remove the Authentication check on Windows Vista that prompts you every time you connect to a pre-Vista machine, add a DWORD registry entry called AuthenticationLevelOverride in the \\HKLM\Software\Microsoft\Terminal Server Client\ key and ensure that its value is set to 0.