HP ProCurve 2510G Series Manual page 44

Configuring Username and Password Security
Front-Panel Security
N o t e
2-18
The alternate password provided by the ProCurve Customer Care Center is
valid only for a single login attempt.
You cannot use the same "one-time-use" password if you lose the password
a second time. Because the password algorithm is randomized based upon
your switch's MAC address, the password will change as soon as you use the
"one-time-use" password provided to you by the ProCurve Customer Care
Center.