Making Sense of Mismatched Certificates?

Ropati writes "I bank with capitalone.com. Recently I went to log in to my credit card account, and my browser reported that the site certificate didn't match the web site I was on. [Expletive.] I'm wondering if I am getting a poisoned DNS URL. I have to log in and do my banking, so I accept the mismatched certificate. The banking site is complete, my transactions are listed but that doesn't mean there isn't a man in the middle attack here. I am still curious how much I have exposed my banking assets." Read on for more, and offer advice on how to interpret what sounds like a flaky response from the bank.

Ropati continues "On the Capital One login page, there is a Verisign link on the page to check that the website is suppose to match. So I click on the verification icon and I am rewarded with a link to Verisign. They report that this web site certificate is for onlinebanking.capitalone.com not the servicing.capitalone.com where I log in. Is this the mismatch my browser reported. I know nothing about certificates.

I call Capital One and ask them to fix the problem. If this was a browser issue on my part, then the Verisign link should match. The tech support supervisor, Joe — XRT413, said he couldn't do anything about it and he couldn't escalate the problem to someone who could.

So my questions are: Are the certificates a mismatch or is my browser bellyaching for nothing? Is the certificate mismatch a security hazard? If someone poisoned my local DNS routers would it be obvious in the URL? How would I prevent such a thing? If everything was working correctly, would the certificate alert me to DNS poisoning, or is this just cosmetic security?"