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23 lines
1.4 KiB
Plaintext
23 lines
1.4 KiB
Plaintext
---
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title: Failed to find Server Action
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---
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## Why This Message Occurred
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For security purposes, Next.js creates encrypted, non-deterministic keys (IDs) to allow for the client to reference and call the [Server Action](/docs/app/getting-started/mutating-data). These keys are periodically recalculated between builds for enhanced security.
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When self-hosting your Next.js application across multiple servers, each server instance may end up with a different encryption key, leading to potential inconsistencies.
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## Possible Ways to Fix It
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To mitigate this, you can overwrite the encryption key using the `process.env.NEXT_SERVER_ACTIONS_ENCRYPTION_KEY` environment variable. Specifying this variable ensures that your encryption keys are persistent across builds, and all server instances use the same key.
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The key must be a base64-encoded value with a valid AES key length (16, 24, or 32 bytes). Set this variable at **build time**—the key is embedded in the build output and used automatically at runtime.
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If you are deploying your Next.js application to Vercel, you can use the feature [Skew Protection](https://vercel.com/docs/deployments/skew-protection) to ensure assets and functions from the previous version are still available, even after a new version is deployed.
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## Useful Links
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- [Server Actions - Security](/docs/app/guides/data-security)
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- [Overwriting encryption keys (advanced)](/docs/app/guides/data-security#overwriting-encryption-keys-advanced)
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