IE Can Not Connect to HTTPS site if the Certificate is Using RSA Keys Greater than 1024 Bits

IE cannot connect to HTTPS site if the certificate is using RSA Keys greater than 1024 bits.  This was preventing me from connecting (using IE9) to a device that had self-signed certificates with 768 bit RSA keys.  The issue was not affecting Firefox browsers.


There are several ways to get around this limitation, but the one I used was running command “certutil -setreg chain\minRSAPubKeyBitLength 512”


Microsoft released a patch in August that you can read more about here: