Elasticache Serverless Memcached "Connection closed by foreign host"

Question

I am trying to set up a serverless Memcached for an ECS service deployed through Fargate, which is running a Golang app.

The service in ECS as well as the serverless Memcached are in the same VPC and have the same security group, where I allowed 11211 port access.

The Golang app throws a timeout when trying to connect to the Memcached.

I also set up an EC2 on the same VPC and security group from where I tried to connect with 
```
telnet memcached-*.serverless.use1.cache.amazonaws.com 11211

Connected to default. memcached-*.serverless.use1.cache.amazonaws.com.
Escape character is '^]'.
stats
Connection closed by foreign host.
```

As soon as I run `stats` the connection is closed, as highlighted above.

PS: I tried setting up a cluster also. This one works as expected.

Answer

Is DNS ok ?
Verify that the endpoint configuration for the serverless Memcached instance is correctly set up and accessible from within the VPC. If there are any DNS resolution issues or endpoint misconfigurations, it could prevent successful connections.

Elasticache Serverless Memcached "Connection closed by foreign host"

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