mqtt 报错 ConnectionRefusedError: [WinError 10061] 由于目标计算机积极拒绝，无法连接。

出现mqtt报错ConnectionRefusedError: [WinError 10061] 由于目标计算机积极拒绝，无法连接的原因是visdom服务器启动失败。解决方法是激活visdom服务器。首先，在当前python环境下输入以下命令：python -m visdom.server。然后等待一段时间，当出现"INFO:root:Application Started You can navigate to http://localhost:8097"的提示时，说明visdom服务器已成功启动。此时，您可以通过访问http://localhost:8097来访问visdom服务器。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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