Load Balancer HTTP 502 Errors
3. Check the ELB access log for duplicate HTTP 502 errors. 502 errors for both elb_status_code and backend_status_code indicate that there is a problem with one or more of the web server instances. Identify which web server instances are exhibiting the problem, then check the web server logs of the backend web server instances. See the following log locations for some common web servers and operating systems:
Apache logs
- The web server logs for CentOS, RHEL, Fedora, and Amazon Linux are located in the /var/log/httpd/ directory.
- The web server logs for Debian and Ubuntu Linux are located in the /var/log/apache2 and /var/log/lighthttpd/ directory.
Nginx logs
- The nginx access log location is defined in the nginx.conf file: access_log /path/to/access.log
- The default location is /var/log/nginx/access.log
IIS logs
The web server logs for Windows IIS 7, IIS 7.5 and IIS 8.0 are stored in the inetpub\logs\Logfiles directory. For more information about the Internet Information Server (IIS) logs, see
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