I cannot connect to my self-hosted Langfuse instance, what should I do?

If you encounter issues while self-hosting Langfuse, ensure the following:

• NEXTAUTH_URL exactly matches the URL you’re accessing Langfuse with. Pay attention to the protocol (http vs https) and the port (e.g., 3000 if you do not expose Langfuse on port 80).
• Set HOSTNAME to 0.0.0.0 if you cannot access Langfuse.
• SSO: Ensure that the OAuth provider is configured correctly. The return path needs to match the NEXTAUTH_URL, and the OAuth client needs to be configured with the correct callback URL.
• Encode special characters in DATABASE_URL, see this StackOverflow answer for details.
• If you use the SDKs to connect with Langfuse, use auth_check() to verify that the connection works.
• Make sure you are at least on Postgres 12.