Q:

AWS ec2 instance not open from some ip

I am facing  an issue with Aws  EC2 system. Suddenly it not open from some ip
Info1: EC2 as hosting and select Ubuntu 14 as OS and install Apache PHP. 
Info2: Rds as mysql database instance. 
issue: 
But Suddenly , it not opening from some ips. It SFTP Access is not working  
and it show connection time out. Also it site not opening from some iP

Can may one tell what is the issue?
Edit:
Inbound setting:

Out bound:

A:

You have to look if the 22 port (for SFTP) accepts connection from you IP in the security group:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html

