AWS Zeppelin notebok服务器JDBC访问被拒绝

Question

当我运行AWS Glue Zeppelin笔记本电脑服务器时出现此错误：

  org.postgresql.util.PSQLException: Could not open SSL root certificate file /home/ec2-user/glue-files/rds-combined-ca-bundle.pem.
  Caused by: java.io.FileNotFoundException: /home/ec2-user/glue-files/rds-combined-ca-bundle.pem (Permission denied)

所以我运行以下内容：

sudo chmod -R ugo+rw /home/ec2-user/glue-files/
sudo chmod -R ugo+rw /home/ec2-user/glue-files/rds-combined-ca-bundle.pem

之后，权利如下所示

                                                      rights    owner
/home/ec2-user/glue-files                             rwxrwxrwx root                         
/home/ec2-user/glue-files/rds-combined-ca-bundle.pem  rw-rw-rw- root

但同样的错误仍然存​​在。关于如何修复它的任何输入？

试过这个

sudo chmod 755 /home/ec2-user/glue-files/rds-combined-ca-bundle.pem 

                                                      rights    owner
/home/ec2-user/glue-files/rds-combined-ca-bundle.pem  rwxr-xr-x root

仍然是同样的错误。