rwth-aachen.de/NS: 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. (134.130.5.9, 2a00:8a60:0:4::9, 2a00:8a60:0:5::9, UDP_-_EDNS0_4096_D_KN)