I have the same opinion but still can not make it working. Pre-fork with socket close also will not help: 
# Workaround for Windows (will not help):
my $h = fork();
if (defined $h and $h == 0) {
    # child
    close($client);
    system($cmd);
    exit(0);
}

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In reply to Re^2: Client socket blocks if server creates subprocess by raandom
in thread Client socket blocks if server creates subprocess by raandom

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