Server 2012 RDWeb "Secure Connection Failed" with Firefox

I'm having a problem accessing RD Web (Server 2012 R2) on Firefox.  I get the following error:

Secure Connection Failed

The connection to the server was reset while the page was loading.
*The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
*Please contact the website owners to inform them of this problem.
I am able to access the page no problem with both IE and Chrome.  I have tried other computers, and they exhibit the same behavior:  IE and Chrome works, Firefox, no

This is a fairly new install of RDS.  I believe that my problem started after I installed certificates for RDS so I could subscribe to the RemoteApps (this is now working beautifully).  All I know is I was able to use Firefox early this morning, I installed the certificates mid morning, and now, late afternoon, I am unable to use Firefox.
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Ayman BakrSenior ConsultantCommented:
This seems to be an issue with the FireFox browser as it seeks a more secure test for certificates with 1024 bit encryption. I am not sure how you have setup your certificates, but I was browsing the net when I stumbled upon an issue almost similar to yours (please navigate to the answers section):
nick2253Author Commented:
I was thinking it might be something like that.  However, I've checked the certificate, and I don't imagine my problem is exactly that.

In the certificate template I'm using, my minimum key size is 2048, and the only provider checked is Microsoft RSA.  When I look at the certificate after I create it, everything looks good:  it's a sha512RSA, 2048bit certificate.

Based on the link, I went ahead and did a fresh install of Firefox 32, and went to my RD Web page.  Now, I'm getting a different error:

The connection was reset

The connection to the server was reset while the page was loading.

*The site could be temporarily unavailable or too busy. Try again in a few moments.
*If you are unable to load any pages, check your computer's network connection.
*If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
I know I can access the server (so it's not a firewall issue), because I can get to other, non-HTTPS pages.

From some research I've done, it looks like sha512 might be to blame for this.  How can I specify sha256 when I create my certificate?  Do I need to modify something in either the certificate template, or is it when I make the certificate request?

nick2253Author Commented:
Ok, further testing:

When I make a self-signed certificate, it's SHA256.  The signed certs I'm making are SHA512.  I'm almost certain that is the issue.  I don't know why Firefox is struggling with that, because I've seen other websites with SHA512 certificates, but since SHA256 is really more than enough for my purposes, I'll just go that route.

For information, I'm requesting certificates by going to certlm, and then right click->All tasks->Request new certificate.  I've looked through the interface, and I don't see any option to set that.

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Windows Server 2012

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