Esxi host disconnected in Vcenter 6.0

Hi,

We currently have 2 identical hardware ESXI 6.0 hosts connected to Vcenter 6.0.

One esxi 6.0 host has an additional VLAN for Voice and is in a disconnected state on Vcenter. I can ping the default VLAN IP and DNS name from every device on the network except from the Vcenter server. From the Vcenter server I can not  ping the default  VLAN by IP or DNS name, but can ping the Voice VLAN.

There are 2 vswitches and Vswitch0 has the only Vkernal for Management Network and the Vlan is set to 0

Any ideas would be appreciated