Chronic problem with AP9631 management card rebooting itself with DNS Network Error, No route to hos

[bbiandov_apc]

Hi everyone,

I'm seeing this across the board on several identical AP9631 cards all connected to a Cisco switch (that seems to be the common denominator):

Chronic problem with AP9631 management card rebooting itself with DNS Network Error No route to host and repeating the two errors 20-30 times right before the watch dog reboot:

09/12/2015 11:07:47 System DNS Network Error, Host is down.
09/12/2015 11:07:47 System DNS Network Error, No route to host.
09/12/2015 11:07:46 System DNS Network Error, Host is down.
09/12/2015 11:07:46 System DNS Network Error, No route to host.
09/12/2015 11:07:46 System DNS Network Error, Host is down.
09/12/2015 11:07:46 System DNS Network Error, No route to host.
09/12/2015 11:07:45 System DNS Network Error, Host is down.
09/12/2015 11:07:45 System DNS Network Error, No route to host.
09/12/2015 11:07:45 System DNS Network Error, Host is down.

When looking at the crash dump of the AP9631 one clearly sees a watch dog timer forced reboot:

Bottom of stack written to and Unknown Reset

I've taken this up with support and they had sensible suggestions but they don't know the cause. Obvisouly the DNS server isn't down and that's some kind of fake error. I have ton of AP9631 but only those connected to the Catalyst seem to be experienceing this issue. The rest have never rebooted by writing to the bottom of the stack. Support had suggested defective AP9631 but I'm just not buying it.

If you have seen this issue and know of a true cause please let me know! Thank you everyone!

[voidstar_apc · Accepted solution]

Haven't seen it myself, but after it happens, you might want to post the debug tarball. In the latest firmware it's under About->Support->Generate Logs.