he.net/TXT: The UDP connection was refused (ECONNREFUSED). See RFC 1035, Sec. 4.2. (216.66.80.18, UDP_-_EDNS0_4096_D_KN)
ql91w.8ou4l.he.net/A has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (3)
he.net/MX: No response was received from the server over UDP (tried 8 times) until the NSID EDNS option was removed (however, this server appeared to respond legitimately to other queries with the NSID EDNS option present). See RFC 6891, Sec. 6.1.2. (216.66.80.18, UDP_-_EDNS0_4096_D_KN)
he.net/SOA: No response was received until the UDP payload size was decreased, indicating that the server might be attempting to send a payload that exceeds the path maximum transmission unit (PMTU) size. See RFC 6891, Sec. 6.2.6. (216.66.80.18, UDP_-_EDNS0_4096_D_KN_0x20)
he.net/CNAME has warnings; select the "Denial of existence" DNSSEC option to see them.