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 50b8fb037f91aa91c4628289bd596fa7.705fe7b9aebc0b34e93cef26490da826.w5yipc7cp5wcq555mqsh.comodoca.com is not the root of its zone.
Instead, try zone transfer on comodoca.com .
Instead, try zone transfer on comodoca.com .