Changes since SOA version
IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.
Not an apex domain
The domain cust-smarthost-pub-03.ktc235a.fibernetics.ca is not the root of its zone.
Instead, try zone transfer on ktc235a.fibernetics.ca .
Instead, try zone transfer on ktc235a.fibernetics.ca .