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Hello @darrenwsun
Thank you for sharing this with the community!
The error generated is documented here: KX Licensing – Licensing server for kdb+ On Demand.
This implies that it requires a kc.lic license key file and an always-on internet connection to operate.
Perhaps you are encountering a firewall because you are connected to a corporate WI-FI or VPN? If so, maybe try this when not connected to the VPN.
However, if a constant internet connection is an issue, it is worth noting that 32-bit kdb+ does not have this requirement and would be the suggested workaround.
Kind regards,
Leah