FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
This article describes the ERR_EMPTY_RESPONSE error encountered in web browsers.
Scope
FortiGate and FortiWeb.
Solution
The error ERR_EMPTY_RESPONSE indicates that a web browser could not retrieve any data from a specified website or server.
Possible Causes:
Server-Side Issues:
The web server failed to send a proper response due to a crash or misconfiguration.
Backend scripts, for instance, PHP or ASP.NET, may be timing out or encountering errors.
Server resources might be overwhelmed, or there is a possibility of high traffic.
Network-Related Problems:
Disruptions in the internet connection.
Misconfigurations in the network.
Interference from proxy servers or VPNs with the connection.
Issues on the Browser's End:
Corrupted browser cache or cookies.
Conflicts arising from browser extensions or plugins.
Settings in the browser that have been misconfigured.
Firewall/Antivirus Software:
Overly strict firewall or antivirus software might block web content.
Potential Solutions:
For Those Administering Servers:
Check for signs of errors or crashes in the server logs.
Verify if backend scripts have any errors or infinite loops.
Confirm the server is not overwhelmed and optimize as necessary.
Troubleshooting Network Issues:
Restart the modem or router.
Utilize tools like 'Down for Everyone or Just Me' to ascertain if the website is down.
If a VPN or proxy is in use, disconnect it and attempt to access the website once more.
Solutions for Browser Issues:
Clear the browser's cache and cookies.
Disable each browser extension one by one to identify if any are causing the problem.
Attempt to access the site using an incognito or private window.
Reset the browser settings to their default values.
Adjustments for Firewall/Antivirus Software:
Try disabling the firewall or antivirus software momentarily to ascertain if it is the cause of the issue (remember to reactivate it afterward).
Modify the settings to include the website in a whitelist or reduce the strictness of the software.
Tips for Avoiding Future Issues:
Conduct regular maintenance on servers.
Use tools to monitor server performance and traffic levels.
Always update the browser to its most recent version.
Install only trustworthy extensions and ensure they are updated.
Engage in safe browsing practices by only visiting secure and verified websites.
Conclusion: The ERR_EMPTY_RESPONSE error can arise from a variety of issues, from problems on the server side to configurations in the browser itself. It can be challenging to identify the precise cause, but by systematically troubleshooting and ruling out potential issues, it is typically possible to resolve the matter.
For further clarification, refer to this article on advanced browser troubleshooting techniques.
