osx - Running a C Server on Mac. How to Connect to it on Terminal for debugging purposes. -

Suppose I was able to execute and run the server:

/ Foo [Portno] [Args]

How do I telnet on a local machine to a server?

I tried the following:

1. Telnet localhost [portno] error: localhost: nodename and pronouns have not been provided, or are not known

2. Telnet [portno] Error: Try 0.1.226.65 ... telnet: Connect to address 0.1.226.65: No route to host Telnet: unable to connect to remote host

   Try it out:

     Telnet 127.0.0.1 [portno]   
    In the  / private / etc / hosts  you < To work for code> localhost , something like the following should be done:  
     127.0.0.1 local host   
    Also, make sure Make sure that you run  telnet 127.0.0.1 123  and not  telnet 127.0.0.1:12223  (where  123  is the port).