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 ec2-40-177-47-0.ca-west-1.compute.amazonaws.com is not the root of its zone.
Instead, try zone transfer on ca-west-1.compute.amazonaws.com .
Instead, try zone transfer on ca-west-1.compute.amazonaws.com .