Describes the cause and action for error messages.
Error Message(English)：
putty error
Unable to connect to EC2 Ubuntu instance from Putty
https://stackoverflow.com/questions/43611977/unable-to-connect-to-ec2-ubuntu-instance-from-putty
Putty error : Unable to open connection to hostname : Host does ...
https://stackoverflow.com/questions/30545804/putty-error-unable-to-open-connection-to-hostname-host-・・・
How come I can't access AWS instance using Private DNS ...
https://stackoverflow.com/questions/43072523/how-come-i-cant-access-aws-instance-using-private-dns-a・・・
"network error: connection refused", putty error
https://stackoverflow.com/questions/15918407/network-error-connection-refused-putty-error
How to connect SSH (AWS instance and Local server) without putty IN ...
https://www.youtube.com/watch?v=yaO0PLWbaLQ
https://www.youtube.com/watch?v=yaO0PLWbaLQ
PuTTY fatal Error - Connection Refused - Super User
https://superuser.com/questions/1185683/putty-fatal-error-connection-refused
network error: Connection timed out while SSH ...
https://superuser.com/questions/1084283/network-error-connection-timed-out-while-ssh-aws-ec2-ubuntu-・・・
linux - SSH Network Error: Software caused ...
https://superuser.com/questions/1083783/ssh-network-error-software-caused-connection-abort