Can't resolve AWS RDS sql express server, Error, cant connect to ip,port

http://imgur.com/a/kzeVm

I have followed the guide, disabled my firewall, verified my security group allows access to everything (initially set to public). Still, 2 installs of mysql won't let ssms connect. No idea why this doesn't work

ACL

100
ALL Traffic
ALL
ALL
0.0.0.0/0
ALLOW

*
ALL Traffic
ALL
ALL
0.0.0.0/0
DENY

Security Group that my db is using

All traffic
All
All
sg-23ae465c (default)

postgres gives me

could not connect to server: Connection timed out (0x0000274C/10060) Is the server running on host "posttest.cnmcgcqc8rkx.us-east-1.rds.amazonaws.com" (52.2.0.231) and accepting TCP/IP connections on port 5432?

mysql can connect, might have to go with that

ecurity groups are not under RDS, they are under EC2's console. ACL's options are under VPC's console. This is not even mentioned in the guide. Seen someone connect on youtube with my exact settings...

This could be one of many things with the given information. The first thing I would check if you know your security groups are set up correctly is to open the port on the Network ACL Inbound Rules.