What is a 504 Gateway Timeout Error?
A 504 Gateway Timeout occurs when a server acting as an intermediary (like an API gateway or load balancer) failed to receive a timely response from an upstream server within the configured timeout window.
Common Causes of 504 Gateway Timeout
- Long-running database queries blocking execution
- Backend API servers unresponsive or deadlocked
- Network latency or dropped packets between CDN edge and origin
- Firewalls silently dropping incoming SYN packets
How to Resolve a 504 Gateway Timeout
- Wait 1 to 2 minutes and refresh the page.
- Test on mobile network — verify whether your local ISP network route is congested.
- Flush DNS resolver cache on your machine.
- Check real-time outage reports on IsDownNow.