@adowns Seems like it is the same issue i’m having.
I’ve detailed in the topic I raised how I get this to ‘work’ for a small number of machines, but I would not call it a fix by any stretch of the imagination.
There is definately an underlying issue, and Tom is aware.
Please see https://forums.fogproject.org/topic/11799/1-5-2-on-debian-multicast-session