ETIMEDOUT connecting to AWS Elasticache (non-cluster)
Problem
Trying to connect to an AWS Elasticache instance and running in to this problem. Verifying that Redis connection works from EC2 instance; [code block] Connecting like this: [code block] Recieving ETIMEDOUT error when connection through `ioredis`; [code block] Timeouts continue indefinitely like above. Out of ideas with this one so if anyone could help I would really appreciate it.
Error Output
error when connection through `ioredis`;
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1 Fix
Resolve ETIMEDOUT Error When Connecting to AWS Elasticache
The ETIMEDOUT error typically occurs when the connection from the EC2 instance to the AWS Elasticache Redis instance is blocked or unreachable. This can be due to incorrect security group settings, VPC configuration, or network ACLs that prevent traffic on the required ports (default Redis port is 6379).
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- 1
Check Security Group Settings
Ensure that the security group associated with your Elasticache instance allows inbound traffic on port 6379 from the security group of your EC2 instance.
- 2
Verify VPC Configuration
Confirm that both the EC2 instance and the Elasticache instance are in the same VPC and subnet. If they are in different VPCs, consider using VPC peering or AWS Transit Gateway.
- 3
Inspect Network ACLs
Check the Network ACLs associated with the subnets of both the EC2 and Elasticache instances to ensure they allow traffic on the Redis port (6379).
- 4
Test Connection with Telnet
Use telnet to test connectivity from the EC2 instance to the Elasticache Redis endpoint. Run the command: `telnet <elasticache-endpoint> 6379`. If it connects, the network settings are correct.
bashtelnet <elasticache-endpoint> 6379 - 5
Review Redis Configuration
Ensure that the Redis instance is configured to accept connections from the EC2 instance's IP address or security group. Check the Redis configuration for any binding issues.
Validation
After applying the above steps, attempt to connect to the Elasticache instance using `ioredis` again. If the connection is successful without timeouts, the issue is resolved. You can also monitor the connection logs for any errors.
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Environment
Submitted by
Alex Chen
2450 rep