今天打开许久没用的Pycharm提示激活码过期，激活提示：“This license 56ZS5PQ1RF has been cancelled”
解决方法如下
首先修改hosts文件，Windows hosts文件在 C:WindowsSystem32driversetc ，Mac 直接用终端修改，在系统根目录 /etc中
1、删除之前配置jetbrains的地址
0.0.0.0 account.jetbrains.com
0.0.0.0 www.jetbrains.com
2、新增配置地址
0.0.0.0 https://account.jetbrains.com:443
3、刷新DNS缓存
Mac :sudo killall -HUP mDNSResponder
Windows :ipconfig /flushdns
4、激活框输入下面激活码
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