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# rhn-channel -u something -p wrongpassword -r -c somechannel
An error has occurred:
<type 'exceptions.TypeError'>
See /var/log/up2date for more information

and in /var/log/up2date:

[Thu Sep  6 10:00:39 2012] up2date
Traceback (most recent call last):
  File "/usr/sbin/rhn-channel", line 164, in <module>
    systemExit(1, e)
  File "/usr/sbin/rhn-channel", line 46, in systemExit
    sys.stderr.write(rhncli.utf8_encode(msg)+'\n')
<type 'exceptions.TypeError'>: unsupported operand type(s) for +: 'AuthenticationOrAccountCreationError' and 'str'

Wouldn't something like "Hey pinhead, you typed the wrong password!" after the command line be a bit more informative?

The error message suggested in the initial comment sounds cute, but I'm
gonna go with the fix from bug #846359 (or #804559 if you will) :-)

*** This bug has been marked as a duplicate of bug 846359 ***