Resolve Connectivity Issues: Web Application Server

My web application is struggling with a major connectivity problem. It simply cannot establish a connection with the server. The error message displaying is "Connection refused."

Ideal skills and experience for the job:

- Proven experience in fixing server connectivity issues for web applications
- Knowledge of error troubleshooting and rectification
- Ability to work promptly as the issue is affecting the functionality of the app

The primary task involves:

- Identifying the root cause of the "connection refused" error
- Implementing an effective solution to restore server connection
- Testing the application post-fix to ensure the problem is resolved completely

Looking forward to bids from experienced professionals who are adept at resolution of such connectivity issues.