The large steaming pile of crap known as United.com has been acting up for me today as well.

Can't log in to view miles. I get a screen that says "Error" in italics, followed on the next line by "Error" in a larger bold non-italics typeface, and then "Mandatory Parameter Check." Very informative.

When I try to log in to create an itinerary, I get the message: "you are about to be directed to a connection that is not secure, do you wish to continue"

Way to go.