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Editorial Team
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Asked: 2026-05-25T23:21:51+00:00

I have a client/server program in c. While the server runs, I can send

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I have a client/server program in c. While the server runs, I can send it command via telnet and it works fine. In addition, nmap reports the port to be open. Similarly, I can successfully use (connect(sock, (struct sockaddr *) &servAddr, sizeof(servAddr)) if my IP is the address of google. However, If I try and use 127.0.0.1 to connect I get a -1 response from connect(). I’m using ports in the 13000 range.
Is there a reason why telnet would be able to communicate with my server but my client program could not?

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1 Answer

  1. Editorial Team

    You either have a local firewall that is preventing your client program from connecting (you may need to whitelist the client program if this is on Windows) or you’re filling in the IP address you pass to connect incorrectly. Depending on the OS you’re using you should either check errno or GetLastError() to see what went wrong.

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