On my system krb5kdc could not start because of rpcbind taking udp port 750 through its use of bindresvport(3). It should be prevented from doing so using portreserve(1)/portrelease(1) in the same way as has been done for cups (see bug #430825). No doubt, some other service will suffer the same problem once krb5kdc is protected from the madness of rpc (I disabled all the rpc services as a work around).
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This should be fixed in 1.6.3-25 and later (1.6.3-24 started, but got some parts of it wrong). Please reopen this bug if you find that this is not the case.