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 a6g2jk4dmeeoksh2kl3dcsde2t6drjnq.rs.eserver.net is not the root of its zone.
Instead, try zone transfer on rs.eserver.net .
Instead, try zone transfer on rs.eserver.net .