I setup a MS NLB for a SharePoint deployment. I have two virtual servers hosted on ESXi 5.0 with an OS of Server 2012 R2. The NLB is setup between the two servers with the cluster operation mode set to multicast and filtering mode affinity is network. I have one virtual NIC on each of the servers. Originally, the NLB is working but then fails to reply to a ping the following day. Thoughts?