send data to SLS fail, error_code:RequestError	error_message:address is null.	endpoint:http://log-global.aliyuncs.com
解决办法:
修改 /usr/local/ilogtail/user_log_config.json

 "defaultEndpoint" :   默认是私网,改成公网域名
 
 然后重启服务即可。
 
  sudo /etc/init.d/ilogtaild stop
  sudo /etc/init.d/ilogtaild start