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Home/ Questions/Q 8848
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Alek Richter
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Alek RichterEnlightened
Asked: January 11, 20222022-01-11T09:14:26+00:00 2022-01-11T09:14:26+00:00

What can be the reasons of connection refused errors?

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I’m trying to write a server program in C, using another client, I get this error when I try to connect through port 2080 for example.

connection refused

What can be the reasons of this error?

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  1. Alek Richter Enlightened
    2022-01-11T09:14:43+00:00Added an answer on January 11, 2022 at 9:14 am

    There could be many reasons, but the most common are:

    The port is not open on the destination machine.

    The port is open on the destination machine, but its backlog of pending connections is full.

    A firewall between the client and server is blocking access (also check local firewalls).

    After checking for firewalls and that the port is open, use telnet to connect to the ip/port to test connectivity. This removes any potential issues from your application.

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