upgrades no longer allow ftp for sets

[NOC]

Since the 23 March snapshot I've no longer been able to get the sets via
ftp during upgrade, is this intentional or is this an error on my end? 
This worked on the snapshot form 19 March and earlier using the
amd64-snapshot bsd.rd indirectly from ftp3.usa.openbsd.org (Local ftp
mirror with rsync daily pull from ftp3).