ProTip: Try taking a look at the relevant logs on the server. Google and stack overflow are excellent resources for troubleshooting errors.
Getting a time out error when trying to navigate to the application in a browser
Double check your security groups and make sure that inbound traffic on HTTPS is allowed.
Error when running finish-install.sh : FAILED to create metadata for user, HTTP status=302
The repository url must match exactly. Typically this happens when http is typed instead of https.
Unable to start repository after installation, error is a classNotFoundException
This is an indication that tomcat has either been incorrectly installed or is missing a key jar file. It seems certain distributions do not include this jar file. Download the jar manually and place it in the tomcat's lib folder,
/opt/apache-tomcat-7.0.39/lib. If your distribution does have this jar, try replacing it with the download.