Embarcadero Rad Studio Firemonkey Indy POP3 IPv6套接字错误11004

int port = 110;
pop3->Host = ...
pop3->Username = ...
pop3->Password = ..
pop3->AuthType = patUserPass;
pop3->IOHandler = iOHandlerStack;
iOHandlerStack->IPVersion = TIdIPVersion::Id_IPv6;
pop3->UseTLS = utNoTLSSupport;
pop3->Port = port;
iOHandlerStack->Port = port;
try
{
    pop3->ConnectTimeout = 5000;
    pop3->Connect(); 
    int msgc = pop3->CheckMessages();
    pop3->Disconnect();
    ShowMessage("OK: " + IntToStr(msgc));
}
catch (Exception &exc)
{
    ShowMessage(exc.Message);
}

如果我在IPv4网络中使用该应用程序,则在连接IPVersion后,该属性将自动设置为Id\u IPv4,并且没有问题。

有趣的是,以下代码在IPv6网络中工作:

IdTCPClient->IPVersion = TIdIPVersion::Id_IPv6;
IdTCPClient->Host = ...
IdTCPClient->Port = 80;
IdTCPClient->Connect();
IdTCPClient->Disconnect();
ShowMessage("OK");

有什么建议吗?