@tom-elliott Hello, sorry, I did not understand what I had to try?

Hey @Sebastian-Roth, Thank you for your answer,
I am used to move the host to a group and then affect an image.
But in order to save time, It would be better to use multicast session
The multicast has already worked but not using this method

Hey, sorry for my bad english because i’m speak french.

SERVER
* FOG VERSION: 1.5.4
* OS: CentOS Linux release 7.2.1511 (Core)

DESCRIPTION
I created a multicast image session under image settings in UI:

Session Name	test
Client Count	2
Timeout (minutes) 5	
Select Image testimage

Once the session creates, if have update she disappear.
If have look in log, have can see that

Have you a solution?
Thank you