No, it doesn't use DNS. All i can see is the Juniper DHCP logs and ARP tables. The AP does not show up in the SZ either. So tomorrow is another day.
Thanks for responding.
Yes. With Factory Reset (via PIN) also not leading to a working SSH/HTTPS.
Problem is the H.510 is in Boston and we are in the Netherlands, but we have ppl there. The H.510 also does not connect to the SZ, and we doublechecked the dhcp and option43....