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the certificate is not from a trusted certifying authority

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Last Modified: 2016-08-07
Please help!  

I have a simple server that I have enabled RDP on at work.  I go home, fire up Remote Desktop, type in a public IP address, log on with my credentials, and I'm in.  

During the logon process, I get an alert like the one attached: "the certificate is not from a trusted certifying authority".  If I go through the process of installing the certificate, I get the prompt "The server name on the certificate is incorrect".  

I don't want to ignore the prompt (I have to explain the prompt to management).  Is there a way I can get rid of it without having to buy an external certificate, setup an enterprise CA, or setting Remote Desktop to not warn me about it (advanced tab > server authentication option)?  Can I safely ignore it, since I'm using an IP address that I know, and can be fairly certain it's not a man in the middle attack?  I do have NLA enabled on the remote box.  

The remote box is server 2012 and my home computer is Windows 7 with the latest version of Remote Desktop.  

Thank you all, I appreciate any help I can get.
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