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 static-c-213-160-35-27.customer.ggaweb.ch is not the root of its zone.
Instead, try zone transfer on customer.ggaweb.ch .
Instead, try zone transfer on customer.ggaweb.ch .