The Keyring AWS user-defined function could not complete because the underlying AWS KMS request failed or returned an error.
ER_KEYRING_AWS_UDF_AWS_KMS_ERROR appears when MySQL’s Keyring AWS UDF cannot get a successful response from AWS Key Management Service. Check network access, AWS credentials, and the KMS key policy, then retry the function call.
ER_KEYRING_AWS_UDF_AWS_KMS_ERROR
MySQL raises error 3198 when a Keyring AWS user-defined function (UDF) such as keyring_aws_encrypt or keyring_aws_decrypt cannot complete because the request to AWS Key Management Service (KMS) failed. The error was introduced in MySQL 5.7.19 alongside the Keyring AWS plugin.
The message includes the name of the failed function and the exact AWS error returned, helping you pinpoint permission issues, key misconfiguration, or connectivity problems.
When this error blocks encryption or decryption, applications that rely on the Keyring for transparent data encryption or key management may fail to start, back up, or rotate keys, exposing data to risk and causing downtime.
Most occurrences stem from AWS IAM permissions that do not allow the kms:Encrypt, kms:Decrypt, or kms:GenerateDataKey actions for the specified KMS key.
Network or VPC settings that block the MySQL server from reaching AWS KMS endpoints will also cause the UDF to fail.
Mismatched or disabled KMS key IDs, region discrepancies, or exceeded KMS request quotas are other frequent triggers.
Verify that the IAM role or access keys used by the MySQL server include kms:Encrypt, kms:Decrypt, kms:GenerateDataKey, and kms:DescribeKey permissions for the target key.
Confirm that the keyring_aws_conf_file has the correct aws_access_key_id, aws_secret_access_key, region, and key_id values.
Run connectivity checks to the KMS endpoint using curl or telnet to ensure outbound ports 443 are open.
When rotating keys, ensure the new key is enabled and your IAM policy references the new key ARN before calling keyring_aws_rotate_keys.
If running in a private subnet, configure a NAT gateway or VPC endpoint for KMS to allow outbound HTTPS traffic.
Store AWS credentials securely via environment variables or the AWS credentials file and limit them to least-privilege permissions.
Automate KMS key policy validation in CI/CD pipelines and monitor CloudWatch for KMS throttling metrics.
Use Galaxy’s connection diagnostics to test KMS reachability and credential validity directly from the SQL editor before deploying changes.
ER_KEYRING_AWS_KMS_ERROR indicates a general initialization failure of the Keyring AWS plugin. Recheck plugin configuration files.
ER_KEYRING_AWS_LOGIN_ERROR means the AWS access key or secret key is invalid. Rotate credentials and restart the plugin.
The IAM user or role lacks kms:Encrypt or kms:Decrypt for the specified key, causing the UDF call to fail.
The key_id in keyring_aws_conf_file does not exist or belongs to another AWS region, leading to a failed KMS request.
Outbound HTTPS traffic to AWS KMS endpoints is blocked by firewall, proxy, or VPC configuration.
The target key is disabled or scheduled for deletion, preventing encryption or decryption operations.
Plugin initialization failed due to a general KMS error.
AWS credentials are missing or invalid in configuration.
The Keyring AWS plugin could not start, often due to library path issues.
No. The Keyring plugin may block startup when it cannot reach KMS, affecting other features.
Yes. The error code persists in MySQL 8.0 and later with the Keyring AWS plugin.
Check the MySQL error log and the AWS CloudTrail logs for precise KMS failure reasons.
Galaxy’s connection tester validates AWS credentials and network reachability, catching misconfigurations before deployment.
.avif)
.avif){kind=logo}
