Hello, We are having the same issue on the public release of iOS 14.2.

Does the issue have a solved solution? I want to NWConnectionGroup to achieve SSDP to discovery our company devices, but I can't receive the response HTTP/1.1 200 OK via unicast. Can someone help me? And I found a error log would display when I start NWConnectionGroup: nw_listener_socket_inbox_create_socket IP_DROP_MEMBERSHIP 239.255.255.250:1900 failed [49: Can't assign requested address]