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1. Check OS (Linux/Window & 32/64-bit)
2. Check JAVA version. (Avoid Java 1.8.0_25, 1.8.0_31, 1.7.0_25 and 1.7.0_45. There is a known issue with these versions, so we don't recommend running JIRA on these versions.)
3. Check any Antivirus / Firewall exists or not. (Which needs to be turned off while installation)
4. Check database server & need following within database.
   
   1. User(role) named as "jira" with encrypted password as "jira" with SUPERUSER, CREATEDB permissions also infinite validity.
   2. Database named as "jiradb" with ENCODING 'UTF8' owner ="jira" & CONNECTION LIMIT will be -1.
5. Check for Supported Platforms here.
6. Download & install JIRA here.

JIRA accessibility Issue

Browser showing such error -

Unable to connect

can't establish a connection to the server

The site could be temporarily unavailable or too busy. Try again in a few moments. (Server shutdown , Unable to ping / reach)

If you are unable to load any pages, check your computer's network connection. (On JIRA server try for localhost:[port number], like localhost:8080)

If your computer or network is protected by a firewall or proxy, make sure that browser is permitted to access the Web. (Turn Off firewall/antivirus)

1. Choose cog Icon >System. Select Troubleshooting and Support > System Info to open the System Info page. Then scroll down the page to view the Java VM Memory Statistics section and look at the memory graph during times of peak usage.
2. Determine available system memory.
3. Increase Available Memory by this.