AW: 5508 Controller sporadically reboots due to lost heartbeat to EnvCnt
Bug ID : CSCtr39523
5508 controller may reboot without an output in the crash file.
fpga: Lost heartbeat from Environment controller, system will reboot in 5
Syslog server if configured :
%ENVMON-0-KEEPALIVE: wlcng_powerSupply.c:280 System is rebooting in 5 seconds:
lost heartbeat from environmental controller
Downgrade to 184.108.40.206.
Although the release notes on CCO may state otherwise, this bug is not fixed,
and will not be fixed, in 220.127.116.11, 18.104.22.168, or any runtime image. It is
fixed only by applying a special FUS image, which updates the FPGA,
Environmental Controller, and USB firmware in the controller.
To find out whether your WLC needs to have the FUS image applied, issue the
command "show sysinfo". A WLC with the fixed firmware will show "FPGA 1.7" (or
The fixed FUS image is now available on CCO (version 22.214.171.124-FUS.)
Configuration consists of a 5508 controller with no APs/Clients attached. It was noticed that at 12-24 hour intervals that it would reboot on it's own due to "fpga: Lost heartbeat from Environment controller". This was originally seen with 126.96.36.199 and later with 188.8.131.52. The controller was migrated to a different room with no connections at all except the console and it still failed. Version 184.108.40.206 was loaded onto it and it ran without failure for 5+ days so there is some interaction between the 7.0.119.x code branch and this particular hardware.
This failure was origionally found at a customer site and has been seen in the SJ01-AW lab as well.