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Thanks Scott. I spent 2 weeks troubleshooting this issue.
I have found it strange that when doing a TCPDump on the SYNC interface, the clusterXL control traffic was visible (8116/TCP) on both the standby and active firewalls, but DNS queries, HTTPS requests and other traffic was only seen on the standby (blocked by the VMWare switch due to coming from a different source MAC).
After setting the "Forged Transmits" to "Accept", everything works as expected.
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