Describes the cause and action for error messages.
Error Message(English)：
not opening
AWS ec2 instance not open from some ip
https://stackoverflow.com/questions/25804126/aws-ec2-instance-not-open-from-some-ip
public DNS of ec2 not opening in browser
https://stackoverflow.com/questions/43001682/public-dns-of-ec2-not-opening-in-browser
PDFs in Amazon S3 don't open in Chrome for view
https://stackoverflow.com/questions/39832289/pdfs-in-amazon-s3-dont-open-in-chrome-for-view
How to open a web server port on EC2 instance
https://stackoverflow.com/questions/17161345/how-to-open-a-web-server-port-on-ec2-instance
IDE just not opening - Cloud9 Community - AWS Cloud9
https://community.c9.io/t/ide-just-not-opening/25039
tcp port 12202 not opening on ubuntu EC2 instance - Server Fault
https://serverfault.com/questions/582034/tcp-port-12202-not-opening-on-ubuntu-ec2-instance
JITSI on AWS configured & installed but not opening - Install & Config ...
https://community.jitsi.org/t/jitsi-on-aws-configured-installed-but-not-opening/15868
AWS not opening external loadbalancer ・ Issue #10692 ・ kubernetes ...
https://github.com/kubernetes/kubernetes/issues/10692
Not opening pdf stored in aws S3 ・ Issue #9 ・ intbot/ng2-pdfjs-viewer ...
https://github.com/intbot/ng2-pdfjs-viewer/issues/9