What is the reason for the failure to establish a connection with the Redis server located on a Google Cloud VM instance using port 6379?

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There are several possible reasons why a connection cannot be established with a Redis server located on a Google Cloud VM instance using port 6379:

1. Firewall restrictions: The Google Cloud VM instance may have firewall settings that restrict inbound connections on port 6379, preventing the Redis server from being accessed.

2. Incorrect IP address or hostname: If the IP address or hostname used to connect to the Redis server is incorrect, the connection attempt will fail.

3. Redis server not running: If the Redis server is not running on the VM instance or is not properly configured, attempts to connect will fail.

4. Redis configuration file issues: If the configuration file for Redis is not properly configured, it may prevent connections from being established.

5. Network issues: Network issues such as packet loss, connectivity issues, or slow internet speeds can also cause connection problems.