When you first log into the IRS FIRE system, you create a password and PIN (personal identification number). The password is something you create and must be 8 alpha/numerics, containing at least 1 uppercase, 1 lowercase and 1 numeric.
If you forget your password or PIN, you can call IRS/ECC-MTB toll-free at 1-866-455-7438 for assistance to creating a new password and/or PIN.
The FIRE system periodically requires users to change their password (usually once a year).