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Starting with NSX 6.2.4, MD5 certificates are not supported for integrating with hardware VTEP gateways. SHA1 SSL certificates are the minimum for an OVSDB connection between an NSX controller and an OVSDB switch. From NSX 6.3, only TLS version 1.2 is supported in the control panel. Hardware VTEP gateways that do not support TLS 1.2 cannot connect to NSX controllers and cannot use VMware NSX 6.3. If you have existing hardware VTEP gateway installed with NSX 6.2, the upgrade will be blocked to avoid disconnecting the hardware VTEP gateways and you must contact VMware support to continue with the upgrade. For more information, see VMware KB 2148511 (https://kb.vmware.com/kb/2148511).

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