We have 3 vSRXs and 2 clusters of SRX1500's and the vSRX's are having issues communicating with thier gateway (1 SRX 1500 cluster reth interface) using the fxp0 interface that is within the mgmt_junos routing instance. Doesn't matter where the test ping is sourced from.
They can communicate with the other SRX1500 cluster with no issues and anything else on the same network.
Layer2 ARP resolves the correct address on both sides.
tcpdump from the vSRX shows the traffic going out with no response. tcpdump on the SRX1500 reth interface shows nothing coming in... only the ARP request and reply.
Attaching diagram of topology to clarify.