Hello Aleš,
Unfortunately, IXFR cannot be disabled with current Knot DNS.
We will consider whether another configuration option is acceptable :-)
Best,
Daniel
On 2018-10-15 10:35, Aleš Rygl wrote:
  Hello,
     Is there a way how to force AXFR for certain masters in the
 configuration? I have a situation with one of master serveres where
 IXFR fails - received response is "Format error". Knot does not fall
 back to AFXR in this case and the zone is going to expire. Using
 zone-retransfer can fix it. Transferring this zone using kdig is also
 ok.
 I can see this with Knot  2.7.2 and Knot 2.7.3 as well.
 BR
 Ales