Fix ConnectionError Error in Rails — In Production

What Is the ConnectionError Error?

When ConnectionError appears in Rails, it usually signals a misconfiguration or environmental issue. Here's how to diagnose and resolve it.

Why It Happens

This error indicates a failed network connection — typically caused by incorrect URLs, DNS issues, or the server being unreachable. In production, this is often triggered by environment differences between local and deployed setups.

The Fix

require 'net/http'

begin
  uri = URI.parse("http://localhost:3000/api")
  response = Net::HTTP.get_response(uri)
rescue Errno::ECONNREFUSED => e
  Rails.logger.error "Connection refused: #{e.message}"
end

Related Errors

This error is often accompanied by other issues in your Rails application. Check for related warnings in your console output that might provide additional context. Sometimes what appears to be a ConnectionError error is actually a symptom of a deeper configuration problem. Review your application's dependency versions to ensure compatibility, and check that all required environment variables are properly set in your deployment configuration.

Prevention

Set up [Bugsly](https://bugsly.dev) to catch this and similar errors in production with detailed stack traces and environment info.

Key Takeaways

• Always handle this error gracefully with proper error handling
• Check your environment configuration — especially in production
• Test thoroughly before deploying to production