Heimdal 0.5.1 ticket forwarding problems

[Harald Barth <haba@pdc.kth.se>]

telnet -f gives me the following output:

[ Trying mutual KERBEROS5 (host/razorbill.pdc.kth.se@NADA.KTH.SE)... ]
[ Kerberos V5 accepts you as ``haba@NADA.KTH.SE'' ]
[ Kerberos V5 refuses forwarded credentials because Read forwarded creds failed:
 Incorrect net address ]

compared to

[ Trying mutual KERBEROS5 (host/ratatosk.pdc.kth.se@NADA.KTH.SE)... ]
[ Kerberos V5 accepts you as ``haba@NADA.KTH.SE'' ]
[ Kerberos V5 accepted forwarded credentials ]

So, is there any real problem with some "incorrect net address" (which
one, by the way?) or is this rather some other obscure problem
resulting from the fact that the two telnetd have different versions
(0.4e / 0.5)? Or may it be a configuration issue?

telnet is version 0.5.1.

Harald.