Try pan no (in small letters)and dateof birth/date of incorporation.
Eg:PAN is ABCDP3563R
date of birth is 04/09/1988
Your password could be abcdp3563r04091988
If this does not work then call at CPC for help
The Password to open TDS Justification Report (Defaults-Zip file) downloaded from Traces Site is Token No. of Regular (original) TDS statement filed for the respective period.