Communication error adding Slave MDM

Fresh install with EMC ScaleIO v2.0-6035.0 using the vcenter plugin on VMware ESXi, 6.0.0, 3380124

During the deployment process, I get this error adding the slave MDM

FAILED (Error code: COMMUNICATION_ERROR) : Add Slave MDM

I already moved to a different set of esx servers (different hardware vendor) and got the exact same error.

I can ping between the hosts using the data IPs below.

Any ideas?

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Jul 19, 2016 8:17:00 PM Host: esx-a1-3.ilab.plexxi.com - SUCCEEDED: Install ScaleIO Module [IP: 172.25.200.3, module: TB]

Jul 19, 2016 8:17:00 PM Host: esx-a1-2.ilab.plexxi.com - SUCCEEDED: Install ScaleIO Module [IP: 172.25.200.2, module: SLAVE_MDM]

Jul 19, 2016 8:17:00 PM Host: esx-a1-1.ilab.plexxi.com - SUCCEEDED: Install ScaleIO Module [IP: 172.25.200.1, module: MASTER_MDM]

Jul 19, 2016 8:17:00 PM Host: esx-a1-1.ilab.plexxi.com - STARTED: Add Master MDM [Mgmt IPs: [172.25.200.1], data IPs: [10.1.100.1, 10.1.101.1]]

Jul 19, 2016 8:17:08 PM Host: esx-a1-1.ilab.plexxi.com - SUCCEEDED: Add Master MDM [Mgmt IPs: [172.25.200.1], data IPs: [10.1.100.1, 10.1.101.1]]

Jul 19, 2016 8:17:08 PM Host: esx-a1-2.ilab.plexxi.com - STARTED: Add Slave MDM [Mgmt IP: 172.25.200.2, data IP 1: 10.1.100.2, data IP 2: 10.1.101.2]

Jul 19, 2016 8:17:11 PM Host: esx-a1-2.ilab.plexxi.com - FAILED (Error code: COMMUNICATION_ERROR) : Add Slave MDM [Mgmt IP: 172.25.200.2, data IP 1: 10.1.100.2, data IP 2: 10.1.101.2]

Jul 19, 2016 8:23:48 PM Host: esx-a1-2.ilab.plexxi.com - STARTED: Add Slave MDM [Mgmt IP: 172.25.200.2, data IP 1: 10.1.100.2, data IP 2: 10.1.101.2]

Jul 19, 2016 8:23:52 PM Host: esx-a1-2.ilab.plexxi.com - FAILED (Error code: COMMUNICATION_ERROR) : Add Slave MDM [Mgmt IP: 172.25.200.2, data IP 1: 10.1.100.2, data IP 2: 10.1.101.2]

Jul 19, 2016 8:37:48 PM Host: esx-a1-2.ilab.plexxi.com - STARTED: Add Slave MDM [Mgmt IP: 172.25.200.2, data IP 1: 10.1.100.2, data IP 2: 10.1.101.2]

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