HAP AC as CAP CRASHES during Chromecast Screen Mirror

RouterOS Wireless Networking
1

Have a HAP AC that is a CAP which consistently crashes when using Chrome screen mirror from the laptop (Intel AC8265) to the Chromecast 2.

  • local forwarding is enabled
  • Both devices connected to 5ghz radio
  • RX strength on the registration table for both devices is between -43 and -51
  • after a few minutes of screen mirror of video content or pictures the HAP AC will reboot
  • log on the HAP AC after reboot logs a system, error, critical message of “router was rebooted without proper shutdown by watchdog timer”
  • first noticed it on bugfix 6.39.3, upgraded to latest bugfix 6.40.6 and issue still occurs

Any help with diagnosing / solving the issue is much appreciated, let me know if more info is needed.

2

Is your power supply supplying enough current? Board temperatures?

3

thanks for the response, power supply is ok and board temperature stays below 50C. I’ve updated the unit to 6.41.3 under the current release tree and the CAP no longer crashes and reboots. However it seems like the 5ghz interface becomes unstable during the screen mirror as devices on the radio disconnect and reconnect.

4

Is it a hAP AC 2 or the original? The new model has lots of issues with the radio due to unstable drivers.

5

it’s the original hap ac which has been very stable for me up until I’ve been using the chromecast screen mirror function. I’ll keep trying different things and keep an eye on the stability, at least it’s no longer crashing and rebooting, but still not at a proper solution.

6

Hi! I have the same problem: RouterBOARD 962UiGS-5HacT2HnT (HAP AC), firmware 6.42.6. When i listening to music or watching video from a mobile device on the Apple TV console, the router may restart unexpectedly. In log there is a record that watchdog rebooted the device. Wifi 5Gz, there are no problems with power or temperature.
After upgrading from 6.40.8 to 6.42.6 there are fewer such problems, but they are not completely solved.
Any idea what it might be? And how can I fix that?

7

I have same issue with RouterBOARD 962UiGS-5HacT2HnT and latest firmware for a few months. When someone stars sharing his computer screen to Google Chromecast over WIFI, router reboots and logs “router was rebooted without proper shutdown by watchdog timer”. I also have checked temperatures under long 100% CPU load and power supply voltages and found no issues with that.

We have two Chromecasts connected to this router and only one of them which is always turned on (running on dedicated power suplly) crashes router. Second Chromecast is powered by TV’s USB port and is turned of when TV is off. This is relevant to quote below.

I found article about similar issue with TP-Link routers and it mentioned this:

According to TP-Link, Google’s Chromecast devices send MDNS packets to discover and maintain a connection to other devices, such as the Google Home. Normally, these packets are sent in 20-second intervals, but it appears that when one of Google’s gadgets wakes from sleep, it sends a massive number of these packets all at once, which overloads the router and causes it to crash.

This sounds like exactly my case - when Chromecast was not used for some time and someone connects to it, it almost instantly crashes Mikrotik router. After router rebooted, Chromecast and everything else works fine until next time it’s not used for a few days and someone connects to it again.

8

I’m having exactly same problem. Having 2 RB952 (HAP AC Lite) and RB4011 WIFI edition. The WiFi networks are managed by CAPsMAN. If Chromecast is connected to an RB952, attempt to cast to it causes RB952 to instantly reboot. If it’s connected to RB4011, cast attempt would cause mass “group key timeout” to everything connected to the same network and wlan interface switches to the “third” state - it is shown as running, but it’s SSID is not seen by anyone and no one can connect to it until I do a manual reset of the interface (by changing it’s config, for example).