This error indicates a connection problem in the PC preventing it from connecting to Zello. The most likely cause is a firewall blocking access to the Internet or Zello. The firewall may be a personal firewall on the PC or a corporate network firewall. If there are no firewalls, it may be due to the Internet Service Provider (ISP) intentionally blocking access to Zello. If an ISP blockage is suspected, installing a VPN app may help to bypass the block.
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