krb_mk_req error 56

[Beata Pruski]

I am trying to resolve the following problem:

I have an application which requests kerberos ticket for service via
krb_mk_req (an API in krbv4w32.dll). As long as version 4 libraries are
used, the call succeeds and application gets the requested ticket. When the
libraries are replaced with kerb v5 (kfw 2.1), the same application receives
an error 56 (send_to_kdc error "Retry count exceeded ").
In both cases the tgt is aquired without any problems.

Note: the same kerberized application, the same libraries v5, the same
registry setup, the same krb5.ini file, the same krb.con and krbrealm.con
files, but on other machine (using different ISP) works fine.

Any help in solving the problem would be greatly appreciated.

Beata