So I won't forget where I documented it
Internet Explorer cannot display the webpage When Connecting to OEM
After applying latest OS updates (October 9, 2012) on Windows XP SP3, Internet Explorer 7 (IE7) can no longer connect to Oracle Enterprise Manager (11g) via SSL (https). Firefox is able to connect to OEM.
Update for Windows XP (KB2661254-V2) affecting certificates. Quick fix: from Add/Remove Programs, check ‘Show updates’, remove Update for Windows XP (KB2661254-V2) and reboot.
Note that removing Windows updates may affect your computer’s security. Proceed at your own risk.
*** UPDATE: Oracle has fixed the issue in MOS ID: 1489557.1 (EM Grid Control 11g Console Not Accessible Via Internet Explorer After Applying Microsoft Security Patches On Client PC)
Microsoft Security Advisory (2661254): Update For Minimum Certificate Key Length
Microsoft Security Advisory (2749655): Compatibility Issues Affecting Signed Microsoft Binaries
The following message is displayed:
Internet Explorer cannot display the webpage Most likely causes: You are not connected to the Internet. The website is encountering problems. There might be a typing error in the address. What you can try: Diagnose Connection Problems More information This problem can be caused by a variety of issues, including: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Name Server (DNS) does not have a listing for the website's domain. If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section. For offline users You can still view subscribed feeds and some recently viewed webpages. To view subscribed feeds Click the Favorites Center button , click Feeds, and then click the feed you want to view. To view recently visited webpages (might not work on all pages) Click Tools , and then click Work Offline. Click the Favorites Center button , click History, and then click the page you want to view.