After upgrade to RedHat 6.0 from RedHat 5.2, talkd
reports "bad protocol version 2" errors every 5 seconds
(approximately).  This may have to do with the fact that
the Upgrade did not change the virtual terminals from the
format ttyp1 to the format pts/1.

Log Excerpt:
May 18 05:32:33 fog talkd[15095]: fog.org (24.112.89.163):
bad protocol version 2
May 18 05:33:08 fog last message repeated 7 times
May 18 05:34:13 fog last message repeated 13 times
May 18 05:35:18 fog last message repeated 13 times

transcript of who command:
[root@fog douglask]# who
root     tty1     May 15 03:50
douglask ttyp0    May 18 05:30 (Courtyard)