# Invalid HMAC / Decryption failed[¶](https://doc.dataiku.com/dss/latest/troubleshooting/problems/decryption-failed.html#invalid-hmac-decryption-failed "Permalink to this headline")

If you receive an error similar to `Decryption Failed, caused by: SecurityException: Invalid HMAC` or `Decryption Failed`, this is usually caused by copying over your `connections.json` file from one instance to another. The `connections.json` file is encrypted with an encryption key that is specific to the original instance.

## Remedy[¶](https://doc.dataiku.com/dss/latest/troubleshooting/problems/decryption-failed.html#remedy "Permalink to this headline")

To resolve this, do not copy over your `connections.json` file from one instance to another. If you receive this error, you will need to re-enter each password for all connections on the instance.
