Jira is not able to a database server

Question

I have installed the Jira and it was working fine but all of a sudden it was not able to connect with the database, so I have tried to uninstall and re-install it back.
But the installation fails with the same below error as "not able to connect with the database". The database server is up and running and I tried to install the Jira on the server where database is running.
Please help me to solve this issue.

Suhas P · Answer

Check if the you can reach to Database server from application server by ping.

Also Check the IP tables entries if it allows the traffic from database server.

Vasiliy Zverev · Answer

In my case this usually happends because of firewall settings or proxy filters.