Error : 2319 - RETRY timedout operation timed out [at timeout_thread:470]

After upgrading to 7.6 from 7.5.1 backup work but replication fails at all time with all VMs.

Error : 2319 - RETRY timedout operation timed out [at timeout_thread:470]

What i noticed so far is the snapshot occured on the selected VM and his replicate but then LAN-FREE failed.

Any hint?