5 RT-thread ENV 工具配置软件包时总是无法连上git网址，无法下载？

fatal: unable to access 'https://gitee.com/RT-Thread-Mirror/at_device.git/': Failed to connect to gitee.com port 443: Connection refused
Error message:[Error 267]
Failed to download software package with git. Please check the network connection.
({'path': '/packages/iot/at_device', 'ver': 'latest', 'name': 'AT_DEVICE'}, 'download failed.')