After being absent from the work site for an extended period, I had a little problem with the dt session. I was being blocked a dt session (automatically logged me out--tried 3x). I observed Tooltalk/dt session errors on the screen.
But I also observed others logging into the same box without incident. Intuitively, I suspected something was wrong with my environment, so I logged in via a remote terminal. Once in the box, I reviewed the /var/adm/messages file and noticed /usr/dt/bin/ttsession errors were associated with my username. The messages file also contained this telling message - $HOME/.TTauthority not writable, auth entry not added.
Hmmm…ownership was not mine. I changed the ownership to yours truly and everything worked like a champ.