9.9.9.9 not taking DNS traffic over PCH through DE-CIX in Dallas

A mouthful, but we're seeing an issue where we can ping 9.9.9.9 but not get response to UDP/53 dns queries. Filtering the prefix 9.9.9.0/24 and taking transports seems to run fine. We're also seeing TCP Resets on SecureDNS. Anyone else seeing something similar? Eric