"Next Auth on AWS EC2: Solving Redirect Issues with Trust Host and AUTH_URL."

Understanding the Issue

The redirection to localhost post-login arises from the default behaviour of Next Auth, which may not align with the custom server setup on AWS EC2. This disparity can lead to a troubling user experience and potential security vulnerabilities. To tackle this, configuring Next Auth to trust the host and explicitly specifying the authentication URL is imperative.

Resolving the Redirect Issue

To rectify the redirect to localhost problem, follow these steps:

1. Trust Host Configuration: In your Next.js project, add trustHost: true to your Next Auth configuration. This setting instructs Next Auth to trust the host provided in the request headers, preventing unexpected redirects to localhost.
2. Environment Variable Setup: Define an environment variable AUTH_URL=yourdomain.com/api/auth in your project. This step ensures that Next Auth consistently uses the specified authentication URL, avoiding redirection inconsistencies.

auth.ts code

env code

By incorporating these adjustments, you can seamlessly integrate Next Auth with your custom AWS server while mitigating the redirect to localhost issue.

Credits: I thank my colleague Pavan Patil from our IT Infra & DevOps Team for collaborating to find the fix.

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