John is troubleshooting a connectivity issue in a distributed application. He notices that the client machine can reach the server's IP address, but the application is still failing. He suspects that the issue might be related to a specific _________ being blocked or not listening.

  • IP Address
  • MAC Address
  • Port
  • Subnet Mask
John is likely dealing with a port-related issue. Ports are used to identify specific services on a server, and if a port is blocked or the associated service isn't listening, it can result in connectivity problems in a distributed application.
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