UDP: sending of multicasts fails after an ifdown / ifup cycle ------------------------------------------------------------- Key: JGRP-1804 URL: https://issues.jboss.org/browse/JGRP-1804 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assignee: Bela Ban Fix For: 3.5 After an ifdown / if up cycle, sending / receiving of multicast messages over mcast_sock fails with an IOException (no such device). Sending / receiving unicast datagram packets works. SOLUTION: Catch the IOException on the send/receive and set the interface again ({{MulticastSocket.setInterface()}}). This was confirmed to work. Perhaps count the number of failures and only reset the interface when the count exceeds a threshold