Good Riddle.

I actually have 3, a good riddle, an ok one, and a bad one.

Good Riddle.
What leads, I follow it's tracks, but when I'm gone, I won't come back.
What am I?

Bad Riddle.
What is red, and is shaped like a bucket.

Ok Riddle.
A man at a high security area needs to put in a password to get in. One day, he goes and his password is wrong.
He goes to his boss and says, "My password is out of date"
His boss then says, "That's right, your password is different. Here's some help on your password. It has the same amount of letters, and 4 of them are the same, but not in the same order."
What was his old password, and what is his new password?