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I'm trying to RDP to a client's server. When trying from Windows 2008 R2, I get the following error after being prompted for my credentials:

From Windows 2008 R2

When I try from Windows 2012, I get an error about the certificate and if I choose to ignore, it connects normally:

From Windows 2012

Why don't I get the option to ignore that error and connect anyways from Windows 2008 R2?

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What are your RDP settings on the 2012 box? – DanBig Dec 13 '13 at 19:07
On the 2K8R2 box check the server authentication options on the Advanced tab. – joeqwerty Dec 13 '13 at 19:19
Are you using Network Level Authentication at W2K8 side ? – krisFR Dec 13 '13 at 23:36
Server auth is set to "warn me", and I already tried the option to just connect. I am using NLA which is why I'm being prompted for login before the session is opened. – blizz Dec 14 '13 at 5:53

I think W2012 shipped with a new version of RDP. Have you tried upgrading your Windows RDP client on your W2K8 box ?

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Where could I find that update? The system is pretty current on automatic updates from what I can see. – blizz Dec 13 '13 at 22:51
@Rico : i don't think an update can solve the problem, i connect everyday using RDP to non updated w2k8R2 servers (i know, bad...). I got certificate warning but have no issues to connect – krisFR Dec 13 '13 at 23:39
This is for example an article describing the changes in the new Remote Desktop Protocol (8.1) . otherwise you can try an alternative client like 2x: – Rico Dec 13 '13 at 23:48

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