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amazon-dynamodb-dax

Can't connect to DAX from EC2 instance in same VPC

I'm in my EC2 instance in the same VPC as my DAX cluster....the cluster's SG is default (allow all) and I still can't connect

Here's an abbreviated code sample:

from amazondax import AmazonDaxClient

dax = AmazonDaxClient(
    endpoint_url="mycluster.i5cagb.clustercfg.dax.use1.cache.amazonaws.com:8111"
)

After waiting a bit, I get this error:

Failed to configure cluster endpoints from 
[('mycluster.i5cagb.clustercfg.dax.use1.cache.amazonaws.com', 8111)]

I tried diagnosing with nc too:

$ nc -zv mycluster.i5cagb.clustercfg.dax.use1.cache.amazonaws.com 8111
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connection to 172.31.43.69 failed: Connection timed out.
Ncat: Trying next address...
Ncat: Connection to 172.31.58.224 failed: Connection timed out.
Ncat: Trying next address...
Ncat: Connection timed out.
Solution

  • As @AbdelrahmanElhaddad pointed out in his comment, this ended up being a security group issue.