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Home/ Questions/Q 902993
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T15:48:15+00:00 2026-05-15T15:48:15+00:00

When calling Socket.Select with lists that are verified to contain only Socket objects, I

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When calling Socket.Select with lists that are verified to contain only Socket objects, I sometimes receive the error An operation was attempted on something that is not a socket. I can’t find a pattern for occurrence.

Socket.Select(readList, writeList, null, timeOut > 0 ? timeOut : 0);
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  1. Editorial Team
    Editorial Team
    2026-05-15T15:48:16+00:00Added an answer on May 15, 2026 at 3:48 pm

    It turns out the sockets were closed. That’s a really dumb error for .NET to be generating though just because of a closed socket.

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