du.edu/TXT: 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. (2600:2000:2210::24, 2600:2000:2220::24, 2600:2000:2230::24, 2600:2000:2240::24, UDP_-_EDNS0_4096_D_KN)