Hello Folks!

I have been running MT devices for 3 years now, with good success.

We have a couple of RB411 who suddenly start to behave strangly, then power themself off at slow random interval (1 time per day in one case and one time per each 10-14 days in another).

Antenna RIC522C (RB411), sadly RIC522C went out of production!
Signal quality is CCQ 99%/100% and Signal strength is -38dBm, SN=58dB
Throughput easely reach 20-35Mbit/s in both directions.
Pings are 1-3 ms.
We use UPS, (APC).
cat5e and cat6 UTP cables, outdoor and indoor variants.
24V DC transformers. (SHL).
PoE injectors from MT (Limmared).

When device has shut itself off, leds are shut off, there is still power from the transformer, 24V.
Dissconnecting power and connecting once again helps in all cases.

In logfile it says that the router was shutoff:
jan/02/1970 01:00:21 system,error,critical router rebooted without proper shutdo
wn, probably power outage
jan/02/1970 01:00:27 wireless,info 00:0C:42:2C:A1:BF@wlan1 established connectio
n on 5320, SSID steen2-5g1

We have changed transformers and UPS, but it did not help.
In another case we replaced the RB411 with an older from shelf, it helped.

Any suggestions ?

They don't happen to have bloated capacitor, do they?

They don't happen to have bloated capacitor, do they?

Okey, I hope you are right.

How do I check those capacitors ?

I noticed several persons have had problems with b411 and rb433 and some other boards, my distributor say they have not yet seen that problem with rb411, but 450.

Now we have 3 of 12 rb411 that shut down themself at random

Have a look for something similar to this:

Ok Thanks nice optical inspection! That is from rb750 board.

Now I know what to look after!

The board I have in front of me (411/411R), the similar capacistors has not become thick.
So in my case they need to be unsoldered from the board in order to be checked.

That operation breaks also warrancy, so the board have to go in return to the distributor for fixing or checking.

The two other board in production (up in mast's) have to be checked later. They are out of warrancy, more than one year old.

Is there anyone who have a drawing of 411 out there ?

Hello Folks!

More information.

When the device has shut itself off, it remains off even if the power is cycled faster than 10-30 seconds.
If you powercycle slowly, remove power and wait 5 minutes and then connect power, then the rb411 starts.

So it looks like the rb411 get stuck by some reason, if it is hardware or software I can not anser.

It is very annoying.

try to remove the UPS device, and also try with a different PSU unit. Maybe one like this: http://www.routerboard.com/index.php?showProduct=84

How hot is the routerboard(on the heatsink) or the power supply? Is it a heat issue?

Hello Folks!

Ok, I have removed the UPS, same problem.

Also I have changed to another transformer 24V 1.2A SHL, same problem.

High power PSU to RB411 sounds overkill, but OK I will try that as well.
The RB411 is outdoor, it is minus 20 to puls 5 celcius has highest. But I will check if it is warm.
There is no voltage or temperature sensor in rb411.

According to the spec sheet - http://routerboard.com/index.php?showProduct=38 - it says that the operating range is from -30 to 60. is it maybe getting to cold? I am from a hot climate so never had the problem of stuff getting too cold, always to hot. Could the rebooting be a symptom of being too cold?

transformer" you need simple switching power supply.

Problem still reamins, and affected customers badwill has become almost out of control.

Tomorrow I will change all rb411 boards to new and see if it helps.

Also all UPS:es will be put back.

We never manage to open one antenna before customer has restarted it either so we can never check if there is any LED combination telling what is wrong.

Devices are simply vanish from both wireless and copper network....

Report back from yesterday activities.

I visited only f the customers Antenna, we did not replace the board due to snow storm.

Instead we did tests suggested here in the forums.

Power off and on the device 10 times in slow nice way, result it starts everytime as expected.
Power off and on the device 10 times in a nasty way quickly, result it starts everytime as expected.

I start to suspect the device get stuck in some way and the watchdog did not manage to reboot the device.

Just in case, we did also change all passwords and ports for remote management of the devices.

After adding UPS:es to all devices that shutdowns themself it seems to have stabilized.
Usally problems comes after 15 days for some antennas and others just after 2-3 days.
So far nothing, nock on wood.

All still working no more random stop devices after adding good UPS to all customers who had the problem.

So the cure was add a good UPS, then it stopped make trouble.

Most likely they have power problems with spikes or similar in their houses/locations.

Hello Folks!

I have read on the forum that several other persons has also experienced that reboot become shutdown by some bug and that it possibly also have impact on watchdog function.

Well we added UPS att almost all our clients antennas and problem went away, but now come back again on very few antennas, the UPS:es are good so no problem here.

The antennas is based on RB411 and RouterOS v4.16 and few v4.17.

So it is likely I am hit by that bug.

Hello Folks!

I can now confirm that the random shutdown bug of RB411 also exist in RB5.4, we have several devices which suddenly stop for no reason, ethernet port indicates link down.

Way to get them start is to remove PoE cable and insert it again, just removing transformer from socket did not help.

The affected devices does not have UPS connected to them yet, that helped us in other situations.
Our power monitoring system from APC has no indication of power problems in the area either.

This is really annoying, something inside the RB411 or Router OS get stuck or shutdown the devices and they never manage to start again.

These problems now make us think in dual RB411 at all customers plus some yet to find some device to remotely power off and on the devices. We try to deliver a realiable service, yet there is to many stops here and there.

Greetings steen, I just wanted to ask you if you have managed to track down this problem as I'm having the same one for quite some time. I have a RB433AH which stops unexpectedly and simply unplugging and replugging the adapter doesn't reset the router, I have to unwire and rewire the cable leading to the tower or unplug the jack and replug at the routerboard to get it started again.

I would really appreciate if you'd share any details you have found what is causing this behavior.

Greetings steen, I just wanted to ask you if you have managed to track down this problem as I'm having the same one for quite some time. I have a RB433AH which stops unexpectedly and simply unplugging and replugging the adapter doesn't reset the router, I have to unwire and rewire the cable leading to the tower or unplug the jack and replug at the routerboard to get it started again.

I would really appreciate if you'd share any details you have found what is causing this behavior.

Sorry for the late answer.
I did track it down, it was two things, a bug in routeros where reboot become halt, but that is fixed long time ago by MT engineers. The second thing was watchdog, during high load on antennas/routers we have noticed that watchdog restart the device. Disable watchdog helped. But we turned it back on again after putting in traffic limits so low that problem does not come up again.