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==Load Balancers==
3 Types of Load Balancers

Application Load Balancers
Network Load Balancers
Classic Load Balancers
504 Error means the gateway has timed out. Application is not responding within the idle timeout period

Trouble shoot the application. Web Server or Database Server?
If you need IPv4 address of your end user, look fro the X-Forwarded-For header.

Instances are monitored but ELB are reported as InService or OutofService.

Health Checks check the instance health by talking to it.

ELB's have their own DNS name. You are never given an IP address

Read the ELB FAQ for Classic Load Balancers

Note: ELB's do not have IP Addresses, only found by DNS namespace