AWS lambda Step Functions Activities and RDS

Question

Is it possible to get Step Functions Activities and query RDS in a single lambda?

I've followed the VPC setting and can reach RDS and S3 endpoint in a single lambda. (ref : https://gist.github.com/reggi/dc5f2620b7b4f515e68e46255ac042a7 )

But when I write a lambda with getActivityTask and RDS, it will response a timeout for connecting to https://states.us-west-2.amazonaws.com:443 . (Caused by: java.net.SocketTimeoutException: connect timed out)

I am sure I have already set the IAM role correctly. I can't figure out if it's a configuration problem or it's simply not possible.

Thanks.

Answer 1

Finally I found out my VPC setting is wrong,

I missed the route tables setting for private subnet (which should be point to public subnet's NAT gateway), so can't connect to AWS public endpoint.