It is a one time action. tpasswd.conf is a file that allows the appserver to access encrypted values in the DB.
There are a few rare occasions that require changing / recreating the tpasswd.conf file, e.g. if you lose the RBACAdmin password, as documented in this KB article:
Has this KB been re-released? I would like to look at it as I likely need to recreate my tpasswd.conf file. If I follow the link, I get to the old BladeLogic site which redirects me to BMC. I have been unsuccessful in finding the article in the BMC KB.
The old kb was converted into "Documents" in this forum, but links were not updated. You can search for 'tpasswd' or password reset and that may find something, or open a support ticket for this, as I believe it involves modifying the database.
Thanks for the info. I have an open ticket related to this issue which I will add this to.