$  ssh localhost -p 12345
ssh: connect to host localhost port 12345: Connection refused
You can find some explanations for typical errors at this link:
            https://red.ht/support_rhel_ssh

The link below provides guidance on resolving common SSH errors:
            https://red.ht/support_rhel_ssh

[root@rh9x64 ~]# ssh localhost -p 12345
ssh: connect to host localhost port 12345: Connection refused
The link below provides guidance on resolving common SSH errors:
            https://red.ht/support_rhel_ssh
[root@rh9x64 ~]# touch /etc/ssh/advanced_ssh_users
[root@rh9x64 ~]# ssh localhost -p 12345
ssh: connect to host localhost port 12345: Connection refused

// openssh-8.7p1-redhat-help.patch 
diff -rNu openssh-8.7p1.orig/ssh.c openssh-8.7p1/ssh.c
--- openssh-8.7p1.orig/ssh.c    2025-05-28 06:48:37.448998092 -0400
+++ openssh-8.7p1/ssh.c 2025-05-28 07:50:19.498156177 -0400
@@ -175,6 +175,20 @@
 extern u_int muxclient_command;
 
 /* Prints a help message to the user.  This function never returns. */
+static void
+redhat_usage(void)
+{
+       if(isatty(fileno(stderr))) {
+               if (access("/etc/ssh/advanced_ssh_users", F_OK) == 0) {
+                       return;
+               } else {
+                       fprintf(stderr,
+"\nThe link below provides guidance on resolving common SSH errors:\n"
+"          https://red.ht/support_rhel_ssh\n"
+                       );
+               }
+       }
+}
 
 static void
 usage(void)
@@ -188,6 +202,7 @@
 "           [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
 "           [-w local_tun[:remote_tun]] destination [command]\n"
        );
+       redhat_usage();
        exit(255);
 }
 
@@ -1609,8 +1624,10 @@
        /* Open a connection to the remote host. */
        if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
            options.connection_attempts,
-           &timeout_ms, options.tcp_keep_alive) != 0)
+           &timeout_ms, options.tcp_keep_alive) != 0) {
+               redhat_usage();
                exit(255);
+       }
 
        if (addrs != NULL)
                freeaddrinfo(addrs);