Server not found in Kerberos database

[Stefan Herrmann]

hello list,

we want to use kerberos for authentication and to secure connections for 
telnet sessions.
so i installed kerberos v5 for the debian system via apt-get and did the 
configuration.
attached are the configs for this system.

kinit works for a user, but the start of a telnet session is refused 
with the message
"Authentication failed". i used the command "kinit stefan" and 
"telnet.krb5 -a -F vxr-r.imos.net."
"vxr-r.imos.net" is the cisco router i want to connect to.
when i look into the logs i see the following messages:

Nov 11 09:49:28 alpha krb5kdc[8745](info): AS_REQ (1 etypes {1}) 
192.168.3.3(16417): NEEDED_PREAUTH: stefan at IMOS.NET for 
krbtgt/IMOS.NET at IMOS.NET, Additional pre-authentication required
Nov 11 09:49:30 alpha krb5kdc[8745](info): AS_REQ (1 etypes {1}) 
192.168.3.3(16417): ISSUE: authtime 1100162970, etypes {rep=1 tkt=16 
ses=1}, stefan at IMOS.NET for krbtgt/IMOS.NET at IMOS.NET
Nov 11 09:49:33 alpha krb5kdc[8745](info): TGS_REQ (1 etypes {1}) 
192.168.3.3(16417): UNKNOWN_SERVER: authtime 1100162970,  
stefan at IMOS.NET for host/vxr-r.imos.net at IMOS.NET, Server not found in 
Kerberos database
Nov 11 09:49:33 alpha krb5kdc[8745](info): TGS_REQ (1 etypes {1}) 
192.168.3.3(16417): UNKNOWN_SERVER: authtime 1100162970,  
stefan at IMOS.NET for host/vxr-r.imos.net at IMOS.NET, Server not found in 
Kerberos database

but the kerberos server alpha.imos.net is in the kerberos database, as 
vxr-r.imos.net is.
can anyone give me a hint what the problem is?
if you need additional infos please tell..

bye
stefan
IMOS.NET
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