Wednesday, June 3, 2015

Internet Explorer 10 "Continue to this website" option missing

When Internet Explorer 10 (Windows 7 64bit) is use to browse a website with a security certificate problem: “There is a problem with this website’s security certificate.”, the “Continue to this website (not recommended).” option is missing.

The issue here is that Microsoft restricted access to pages which are using a key using less than 1024 bits for protection. Some Oracle product using websites (including Oracle VM Manager) are still using this!
 

Oracle VM Manager using 512bits-key
Oracle VM Manager using 512bits-key

Browsing to the site, (which must be done to https in Oracle VM Manager 3.2), gives the page without the Continue to this website (not recommended) option:

There is a problem with this website's security certificate

There is a problem with this website’s security certificate

Less than 1024 key restriction

After browsing around on the internet I found a Microsoft Knowledge Base article about an advise to block the use of RSA certificates that have keys that are less than 1024 bits long… : http://support.microsoft.com/kb/2661254
To skip all the text on this page to the command one needs to unblock this restriction and for example set the minimum key length to 512; run the following in a elevated command line (cmd.exe ‘run-as-administrator’):
 
certutil -setreg chain\minRSAPubKeyBitLength 512
 
Now the “Continue to this website (not recommended).” is back!

Continue to this website (not recommended).

Continue to this website (not recommended).
If you want to revert this change and go back to the default of an 1024 bit key minimum, run:
 
certutil -delreg chain\MinRsaPubKeyBitLength


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