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To determine which service is running on a specific port in Red Hat Enterprise Linux (RHEL), using the command that displays network connections and listening ports along with associated services is essential. The command `ss -lptn` is particularly effective for this purpose since it provides detailed information about sockets, including the protocol used, the local address and port, the state, and the process ID (PID) of the service that is using that port. The inclusion of the `-p` option allows you to see the process name along with the PID, helping to identify exactly which service is running.

The `-l` flag specifies to show only listening sockets, while `-t` indicates TCP sockets and `-n` prevents the service from resolving names, ensuring that the output is quick and straightforward. This combination makes `ss` a highly efficient tool for network analysis.

Using the command `netstat -tuln` also provides useful information regarding active connections and listening ports, but it is considered somewhat deprecated in favor of `ss`, which offers more functionality.

The other options such as `portscan` might be a potential utility for scanning ports but is not a standard RHEL command for checking running services. The command `service-status`