I have several boxes that lost multicast after an upgrade from MS 9.32 to 9.37.  They've coasted through upgrades before, but this time it did not work.  IGMP snooping is enabled.   On the boxes receiving multicast, netstat -g shows subscription to all of the groups, but I'm not seeing the IGMP join traffic until I forced the software to restart.  (The software itself leaves the IGMP management up to the OS, and it's an older Linux kernel - 3.10)   Has anyone else observed this? ... View more