Cisco VPN :: 1941ISR Users Won't Have To Specify IP Address In URL Address Box

I recently configured and installed a 1941ISR for a customer. The customer purchased a 25-User SSLVPN license with the router, and I configured it for remote SSLVPN access. This is working nicely except for one issue: when users initiate an SSLVPN connection request by browsing to the assigned webvpn gateway IP, they get the "There is a problem with this website's security certificate" browser message. They are in the process of working with their DNS hosting provider to get a DNS entry assigned to the IP address so the users won't have to specify an IP address in the URL address box, but they will continue to get the certificate error until/unless I can figure out how to resolve the issue.
 
I've tried the following "How to make IE8 trust a self-signed certificate in 20 irritating steps" that I found via another forum link but with no luck:
 
1.Browse to the site whose certificate you want to trust.
2.When told "There is a problem with this website's security certificate.", choose "Continue to this website (not recommended)."
3.Select Tools->Internet Options.
4.Select Security->Trusted sites->Sites.
5.Confirm the URL matches, and click "Add" then "Close".
6.Close the "Internet Options" dialog box with either "OK" or "Cancel".
7.Refresh the current page.
8.When told "There is a problem with this website's security certificate.", choose "Continue to this website (not recommended)."
9.Click on "Certificate Error" at the right of the address bar and select "View certificates".
10.Click on "Install Certificate...", then in the wizard, click "Next".
11.On the next page select "Place all certificates in the following store".
12.Click "Browse", select "Trusted Root Certification Authorities", and click "OK".
13.Back in the wizard, click "Next", the "Finish".
14.If you get a "Security Warning" message box, click "Yes".
15.Dismiss the message box with "OK".
16.Select Tools->Internet Options.
17.Select Security->Trusted sites->Sites.
18.Select the URL you just added, click "Remove", then "Close".
19.Now shut down all running instances of IE, and start up IE again.
20.The site's certificate should now be trusted.

I followed all 20 irritating steps to the letter, but am still getting the security certificate nat.Now when I “Continue to this website (not recommended)” and click on "Certificate Error" at the right of the address bar, the certificate error windows says “Mismatched Address”.Is there a way that I can get this fixed without resorting to a 3rd party CA?