Hi, We have 2 FIM Portal servers running on different Guest VMs on 2 different physical Hyper-v servers. Trying to configure NLB between them. This is what we have done: Registered the 'A' record in DNS (10.1.1.20) for IDM.Company.com installed NLB service on each FIM Portal server configured it with the 10.1.1.20 IP and IDM.company.com 9as the virtual name and IP) in Unicast mode In Hyper-v I ensured that the MAC address is set to Static (on Virtual network card config) and the MAC address is the one obtained from the NLB configuration. Enabled MAC spoofing checkbox. (followed this guide: http://robwhitehouse.com/virtualisation/enable-nlb-in-a-hyper-v-guest/) Rebooted both servers. even though both computers have the same IDM.company.com NLB configured and visible in their NLB GUI interfaces i still get the following errors: On server 1 error is: Host unreachable. Error connecting to Server 2. On server 2 error is: Host unreachable. Error connecting to Server 1. For now I have also disabled the Windows Firewall on both guest VMs Any ideas on why?