Zone transfer problem 9.1.1 -> 4.9.x

[Ralf Hildebrandt]

When a 4.9.x BIND tries to transfer a zone from our BIND-9.1.1 (RH Linux),
it sees in it's logs:

Apr 23 16:15:49 aix1 named-xfer[72704]: print_output: short answer (43, 53), zone bvb.berliner-volksbank.de

Zone transfers between BIND-9.1.1 and BIND-9.1.1 work just fine.