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Probably you can try this, it should be similar for Windows IIS
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Windows didn’t like that the GoDaddy auto-renewal was using the same private key. I generated a new certificate request for the FQDN, and I did it in IIS Manager, not in Certlm.<br />
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I submitted the CSR it generated (2048bit) and got a new certificate issued. I downloaded the IIS one, then imported it into Certificates - Local Computer &gt;&nbsp;Personal in certlm. I could then export it by itself to a pfx file (I did export the private key, did not delete the private key, and did export all extended properties).<br />
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This made a pfx file I could set as the certificate for each item in the Remote Desktop &gt;&nbsp;Deployment Properties &nbsp;&gt; Certificates window of Server Manager. Note that I had to “Select Existing Certificate” select the pfx from the file path and enter the password, and clicked Apply four separate times.
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<a href="https://sg.godaddy.com/community/SSL-And-Security/Trying-to-renew-my-Remote-Desktop-Certificate-in-2012r2/td-p/48414" rel="ugc">https://sg.godaddy.com/community/SSL-And-Security/Trying-to-renew-my-Remote-Desktop-Certificate-in-2012r2/td-p/48414</a><br />
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Screen shots in <a href="https://support.quovadisglobal.com/kb/a405/how-do-i-install-an-ssl-certificate-onto-rdp-for-windows-server-2008.aspx" rel="ugc">https://support.quovadisglobal.com/kb/a405/how-do-i-install-an-ssl-certificate-onto-rdp-for-windows-server-2008.aspx</a>
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SSL Cert for remote.website.com on Remote Desktop Gateway (Server 2008 R2) is about to expire in a month.<br />
Renew SSL Cert on Godaddy.<br />
What type of server file do I download from Godaddy? &nbsp;<br />
I assume it is IIS file type.<br />
Keep seeing on the forum that I need to convert it the crt file on Goddady to a pfx.<br />
How do renew the SSL Cert on the Remote Desktop Gateway?
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SSL Cert for remote.website.com on Remote Desktop Gateway (Server 2008 R2) is about to expire in a month.
Renew SSL Cert on Godaddy.
What type of server file do I download from Godaddy?  
I assume it is IIS file type.
Keep seeing on the forum that I need to convert it the crt file on Goddady to a pfx.
How do renew the SSL Cert on the Remote Desktop Gateway?

Renew SSL Cert for Remote Desktop Gateway (Server 2008 R2)

HTTPS is a protocol for secure communication over a computer network which is widely used on the Internet. HTTPS consists of communication over Hypertext Transfer Protocol (HTTP) within a connection encrypted by Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL). The main motivation for HTTPS is authentication of the visited website and to protect the privacy and integrity of the exchanged data. HTTPS is widely used for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and web browsing private.