who doesn't work after upgrade from RH 4.2 -> 5.1

The who command doesn't work after the upgrade from RedHat 4.2 to Redhat 5.1. The wtmp file seems to be OK. The local (telnet) users will show up, but the dialup users do not.
brunovanAsked:
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jetxConnect With a Mentor Commented:
first of all, you should have upgraded to 5.0 first then to 5.1
because some files are not compatible with 5.1 from 4.6
that may cause error on some of your newly installed apps.

-Jeff
try backing up your configurations and reinstall 5.1
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shootersCommented:
Try using w instead of who.
It gives more information.
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brunovanAuthor Commented:
I get the same thing when I use w. The problem seems to be in the utmp file. I still can not see the dialup sessions. When I look in utmp, I can see the dialups, but not when I use who or w. I have tried to empty out the utmp file, delete, and recreate, but still the same response.
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