How to Resolve 502 Bad Gateway

Issue: Attempting to login to a sensor via its web UI at https://x.x.x.x:1443 results with displaying the 502 BAD GATEWAY error message.

Cause: This is often indicative the last update performed to the sensor failed.

Perform the following steps to resolve the issue:

Use SSH and login to the sensor with the pwnie user account.
Type sudo su and press Enter, then re-type the password to become superuser.
Next, type px-connection-dr and press Enter to verify the sensor has connectivity to the update servers.

Important

When using the px-connection-dr command/script the tests performed include checking DNS resolution, checking TCP connectivity to ports 80, 443 and 873 and ensuring SSL Filtering is *not* being performed upon any of the connections. It is therefore required for *all* tests to either reflect SUCCESS and/or VALID. If any of the tests should reflect FAILURE and/or INVALID, then the issue involving connectivity needs to be resolved before continuing.
Assuming all tests passed, type rm /opt/pwnix/chef/latest-version-id and press Enter to remove a file indicative of the last update performed.
Next, type rm /opt/pwnix/chef/installed-version-id and press Enter to allow the sensor to attempt updates again within 24 hours of the last update. Note this file may not exist.
Now, type px-system-update and allow the sensor to update itself.

Important

Do not interfere with the sensor until it is finished and you are returned to the # prompt. Please know it may take the sensor as long as 45 minutes to update.
After returned to the # prompt and to be sure the sensor is fully up-to-date, please repeat steps five and six. This second update will likely take much less time, often less than five minutes.
When finished and returned to the # prompt, you should be all set to continue with the use of the sensor.

Tip

To validate a sensor is up-to-date, type cat /etc/motd and press Enter, then review the banner displayed specifically looking at the Pwnix Release. Next, review the History of Pwnix Releases article.

_Copyright

_{© 2024 Outpost24® All rights reserved.}_{This document may only be redistributed unedited and unaltered. This document may be cited and referenced only if clearly crediting Outpost24® and this document as the source. Any other reproduction and redistribution in print or electronically is strictly prohibited without explicit permission.}

_Trademark

_{Outpost24® and OUTSCAN™ are trademarks of Outpost24® and its affiliated companies. All other brand names, product names or trademarks belong to their respective owners.}