Troubleshoot symantec security virtual appliance (SVA)

Symantec has introduced VShield integration feature with 12.1 but they do not have good guideline on troubleshooting and how it works (network level, ports etc.)

Recently I’ve installed 2 SVA and both of them are showing offline in SEPM console – I’m really not sure how to troubleshoot this and bring them online.

Please assist if anyone have gone through this type of issue?

Thanks.