Thank you very much for this information. I got the same error, spent all day upgrading my old OS and browsers, still to get the same *(@! error. The web support guy told me 1) that it was a timeout error since I had to complete the rez within 15 min. I said this was not the problem at all. Then he said 2) that my IE security settings had to be set to medium. I did this, but found it weird since Firefox gave me the same error. Anyhow, he told me to call back if it did not work, and so I did, and he told me 3) that this flight was not bookable online and that I had to call Customer Service. When I asked if there would be a fee, he said yes. (!!).

So I call, and they of course want to charge 30 bucks per ticket. After I mention that I saw the error described here, they relented, and I did not pay the 30 bucks. So don't let them get away with it!!