IDEA Unable to import maven project: See logs for details

问题

启动idea，报 Unable to import maven project: See logs for details ，点击查看日志。

能看到一堆日志，如果出现下列内容。请检查能否ping 通 127.0.0.1，也就是请关闭防火墙。
其他解决方式请参考:IDEA Unable to import maven project: See logs for details （maven的坑）

Caused by: java.rmi.RemoteException: Cannot start maven service; nested exception is: 
	java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: 
	java.net.ConnectException: Connection timed out: connect