Error: elasticache certificate verify failed

Solution

What's Causing This Error

The 'elasticache certificate verify failed' error message occurs when there's a problem with SSL/TLS certificate validation while connecting to an Amazon ElastiCache node. This usually happens because the client application or driver used to connect to the ElastiCache cluster isn't configured correctly to trust the SSL/TLS certificate provided by the ElastiCache endpoint.

Another possible cause of the error is an expired, invalid, or revoked SSL/TLS certificate provided by the ElastiCache endpoint.

## Solution - Here's How To Resolve It

Here are some steps you can take to troubleshoot and resolve the issue:

1. Check the certificate validity: Ensure that the SSL/TLS certificate used by your ElastiCache cluster is valid and has not expired. You can verify this by checking the expiration date of the certificate.
2. Update CA certificates: Make sure that the CA (Certificate Authority) certificates on your client system are up to date. Outdated or missing CA certificates can cause the verification to fail. Update the CA certificate bundle on your system, typically found in /etc/ssl/certs/ca-certificates.crt on Linux systems.
3. Verify certificate chain: Check if the certificate chain is properly configured. The client needs access to the full chain of certificates to verify the ElastiCache SSL/TLS certificate. Ensure that all intermediate certificates and the root CA certificate are correctly configured on your client system.
4. Check for network issues: Network connectivity problems, such as firewalls or proxy settings, can interfere with the SSL/TLS certificate verification process. Ensure that the necessary ports (e.g., 6379 for Redis) are open and that any proxies or firewalls are properly configured to allow the connection.
5. Verify DNS resolution: Ensure that the ElastiCache endpoint is resolving to the correct IP address. Incorrect DNS resolution can cause connection issues and certificate verification failures. You can verify the DNS resolution by using the nslookup or dig command followed by the ElastiCache endpoint.
6. Validate client SSL/TLS configuration: If you are using a client library or framework to connect to ElastiCache, review the SSL/TLS configuration options. Ensure that the client is set to validate the server certificate and that it is not explicitly configured to ignore certificate verification errors.
7. Contact AWS Support: If you have followed the above steps and the issue persists, it is recommended to reach out to AWS Support for further assistance. They can help diagnose the problem and provide guidance specific to your ElastiCache configuration.
   
   By following these steps, you should be able to troubleshoot and resolve the "certificate verify failed" error when connecting to Amazon ElastiCache.