krenew: error renewing credentials: KDC returned error string: NO PREAUTH

[Greg Hudson]

On Sat, 2009-08-01 at 09:39 -0400, marcus.nilsson at pulsen.se wrote:
> -----Greg Hudson <ghudson at MIT.EDU> wrote: -----
> 
> >Is the requires-preauth bit set on your krbtgt/MERA.NU principal?

> kadmin:  getprinc krbtgt/MERA.NU
> [...]
> Attributes: REQUIRES_PRE_AUTH
> Policy: [none]

So... yes.  Do you have any idea why?  I believe this is why ticket
renewal is failing.