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Spirent KB Article
Doc ID: FAQ14805
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Spirent TestCenter: Does the STCv Port need to maintain constant connectivity to the Virtual Controller?
License Controller (license server)
There is a periodic heartbeat (30s). You can’t take away connectivity to the license server once the endpoint is up.
If communication between the VM and the license server is cut abnormally the port license will timeout after 15 minutes.
Also note there must be ping capability between the VM and license server. When a VM is brought up, it tests connectivity to the license server with a ping.
for additional TCP port numbers used with Spirent Virtual.
Product : STC Virtual