Disabled power saving states on the Dell? Firmware updated?
SSDs are enterprise or desktop versions?
I have feeling, you have disk problem, missing virtio drivers in Window VMs etc, but nothing concrete, no VM config/pve versions written.
Maybe...
MTU is 1500 for all servers, switches has 9216. Remotes the same location, the same switch and vlan.
Because internal CA, fingeprints (FP):
Configured for REMOTE1:8006:
from pveproxy-ssl.pem FP - BUT - it automatically detects intermediate...
Nothing spotted yet, because remotes are in production and there is nothing non-standard even on netdata (i can miss something of course).
Today 4x test moving real vm 10+200 GB, migration fails for 2nd disk around 17-19/16-17 GB position...