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Editorial Team
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Asked: 2026-05-24T09:30:26+00:00

I have not seen any important TCP/IP server not use SO_REUSEADDR : Apache HTTP

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I have not seen any important TCP/IP server not use SO_REUSEADDR :

Is there any use case for not using SO_REUSEADDR on TCP/IP servers ?

I mean, would making the OS always use SO_REUSEADDR break any server that does not use it?

Do you know a TCP/IP server that not uses SO_REUSEADDR for a reason?

(of course you may not want to use it on MSWindows as it allows to run two servers on the same port)

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  1. Editorial Team

    Well, UNP (Stevens 2004) says:

    SO_REUSEADDR allows a listening server to start and bind its
    well-known port, even if previously established connections exist that
    use this port as their local port.

    All TCP servers should specify this socket option to allow the server
    to be restarted

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