Incorrect network configuration: The network settings of the container are wrong, such as IP address conflicts or incorrect subnet masks.
Firewall settings: The firewall is preventing the container from establishing network connections.
Port not open: The ports required for the service running in the container have not been opened within the container or on the host machine.
Service not started: The service running within the container did not start correctly or exited abnormally.
Insufficient container resources: The host machine where the container is located does not have enough resources, such as insufficient memory or high CPU load.
Container configuration error: An error in the container configuration is preventing the service from running or connecting properly.
DNS resolution issue: Containers cannot resolve hostnames or domain names, resulting in the inability to connect to external services.
Server configuration issues: Connection refusal may be caused by server settings, such as IP whitelisting or access control settings.
