Without more information, it's hard to provide a thorough answer to your question. One place to look to start debugging an issue is Jira's log file. It is usually found at: /var/atlassian/application-data/jira/log/atlassian-jira.log

For full instructions on installing Jira on a Linux server, see the documentation from Atlassian.

One common issue with Tomcat, the web server used by Jira, is that its default entropy source is blocking and will cause extremely long startup times in some environments such as cloud servers. In your /path/to/jira/bin/setenv.sh file you can configure a non-blocking entropy source by adjusting the JVM_SUPPORT_RECOMMENDED_ARGS variable like:

JVM_SUPPORT_RECOMMENDED_ARGS="-Djava.security.egd=file:/dev/./urandom"

I was having same issue and hopefully it might help someone else in future. What I found out that Tomcat was listening on port 8080 over IPV6 so I had to enable and configure IPV6. You can also configure Tomcat to start on ip4 rather than ip6.