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Kerbia
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hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Tue May 22, 2018 1:59 pm

Hello,
since ~1 week, i have wifi problems with my MT hap ac^2.

All devices get irregular disconnects and no device is able to reconnect to the access point any more. Ethernet connection is still possible.

I'm using Firware 6.42.2 - but I have the same issue with the latest RC version.

The first time it happened the Log showed the following messages:
disconnected, group key exchange timeout
disconnected, unicast key exchange timeout
Since I read about some NTP issues, I switched to a different NTP server. The unicast key problem seems to be gone since then.
With my hap lite, i didn't have any issues like that for more than 2 years.

However, the group key exchange remains.
Update interval is 5 minutes. Using WPA with AES. WPA Passwort consists of letters and numbers only.
Last edited by Kerbia on Fri May 25, 2018 1:18 pm, edited 2 times in total.
 
aidan
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Re: hap ac^2 - Disconnects and no Reconnect possible - Group Key Exchange

Tue May 22, 2018 3:26 pm

A group update interval of 5 minutes is rather low. What happens if you set it to an hour?
 
Kerbia
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Re: hap ac^2 - Disconnects and no Reconnect possible - Group Key Exchange

Wed May 23, 2018 4:43 pm

Hey!
I made the changes you suggested. Exact 25 hours after I made the changes and restarted the router, all clients disconnect again and can't reconnect.

Any more ideas?
 
Sparxx
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Re: hap ac^2 - Disconnects and no Reconnect possible - Group Key Exchange

Wed May 23, 2018 5:07 pm

Do you have any Virtual AP interface binded to any physical interface ?
 
Kerbia
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Re: hap ac^2 - Disconnects and no Reconnect possible - Group Key Exchange

Wed May 23, 2018 5:19 pm

yes i do - i have a virtual AP on 2.4 ghz which is used for the guest network
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Sat May 26, 2018 11:45 am

I checked my other devices, I see the same problem on a hap lite, cap ac and the already mentioned hap ac^2.

The following firmwares were tested on all of those devices so far:
- 6.40.8
- 6.42.2
- 6.42.3
 
uldis
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Mon May 28, 2018 10:38 am

Does this problem happens also on the RouterOS v6.43rc version?
It happens on both 2.4ghz and 5ghz wifi?
Only disable/enable helps?
Could you make support output file at that time and send it to support@mikrotik.com
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Mon May 28, 2018 8:14 pm

Since i have these issues, i tried out every new RC version. It didn't help.

Enabling/Disabling helps, but not always. When i couldn't reconnect at all any more i just switched between firmwares to get it going again.

Support output file was sent to support last week. I'm waiting for a response.

I am unsure if it happens only on 2.4ghz or also on 5ghz. I will check and provide this information in 2-3 days, when I am at home again.


I also noticed group exchange timeouts on an hap lite, after updating it. Before, i didn't have any kind of such messages in the log.
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Fri Jun 01, 2018 2:57 am

6 days ago they just asked me if i already tried out the RC versions, which was already mentioned in the ticket itself.

since that time, i didn't get any response from the support.
Hello,

Thank you for writing to MikroTik Support.
This is an automated reply.

We will try to help you as soon as possible (reply might take up to 3 business days).
3 business days....

Every day I am getting more and more fed up with MT. The last 2 months were a pain. Let's see how long my patience will last.
 
Rudolfs
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Fri Jun 01, 2018 9:47 am

Hello, we replied to your ticket within three business days stating a question about whether the issue is still relevant in the latest RC version at the time, but never got back a reply from you. Since 6.42.2 there have been quite a few improvements for hAP ac^2 and we hope that your issue is fixed within these releases. If it is not, please reply to the ticket you submitted.
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Fri Jun 01, 2018 1:30 pm

I answered two times on the ticket:
- 1st time: 25.05.2018 at 11:54
Hello,
it does not appear on 6.41.4 or 60.40.8.

However, running the 60.40.8 isn't a real alternative to me, since the wireless performance of the device isn't as good as with the current or RC firmware.

Regards

- 2nd time: 28.05.2018 at 19:20
Hello,
after some more testing, i have to correct myself:

The issue appears on the following firmware Versions: 6.40.8, 6.42.2, 6.42.3.

More testing is going on here, on multiple devices.


Did you already make investigations in my support file?

Regards
I didn't get any error message from the mailservers or your ticket system. Messages to other people also arrived. So I assume they got delivered successfully.
 
brg3466
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Sat Jun 02, 2018 8:47 pm

I have reported the same issue on other thread. But I can add here that I have same issues on cAP ac as well. My firmware is 6.42.3. The WiFi will drop and if you check the log, it was “ group key timeout”. And my iPhone goes to LTE until you notice it. It won’t automatically reconnect to WiFi until you manually do it.
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Tue Jun 05, 2018 2:18 am

Hello, we replied to your ticket within three business days stating a question about whether the issue is still relevant in the latest RC version at the time, but never got back a reply from you. Since 6.42.2 there have been quite a few improvements for hAP ac^2 and we hope that your issue is fixed within these releases. If it is not, please reply to the ticket you submitted.
I just dropped a reminder by Email two minutes ago, that I still didn't get any response 1.5 weeks after the last message.

If my messages really don't appear in your ticket system, something is wrong with it. However, I don't believe that you didn't receive the Emails. I feel that's how Mikrotik support looks like these days. I expected something else. Won't buy any products any more, irregardless of how this issue will be solved or not solved from now on. Maybe even leaving some warnings for potential future customers on Amazon etc.
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Thu Jun 07, 2018 1:02 pm

Thats's a message I received from support:
i see that this device is passing VLANs through, what is the lease time on DHCP server?
Does disconnects happen on intervals at half of lease time?
Can You increase it for a test?
My lease time was 3 days. I increased it to 5 days and didn't see any improvement.
brg3466, can you test this as well and share your experience?

Disconnects do not happen on a reproducable intervall - that means a NO to question no. 2 of the support.
 
gm2066
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Fri Jun 08, 2018 12:05 am

it seams that I have the same isue:
Time Jun/07/2018 22:50:36
Buffer memory
Topics
wireless
info
Message 5C:CF:7F:B1:44:7C@wlan1: disconnected, group key exchange timeout

any help?
 
brg3466
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Mon Jun 11, 2018 2:46 am

I used to have lease time for 5 minutes and later I changed to 1hr, but no improvement on the disconnection issues. I changed to 1 day the other day but the disconnection still happened.
My firmware is 6.42.3. My wireless setting is very simple , CCR1009 + 3 cAP ac and the CAPsMAN is on CCR1009. I tried to make static address on dhcp server for my apple stuff, iphone, ipad, etc , but it doesn't work. From time to time, the iphone lost connection due to the " group key exchange timeout" and couldn't connect to wifi automatically, I need to do it manually.
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Tue Jun 12, 2018 7:36 pm

After I changed the DHCP Lease Time and told them that this did not have any positive or negative effect at all, they wrote me a new Email few hours ago.

They ask now if i collected some more information which would help them to understand the problem. Unfortunately I am not able to deliver more information, since I have absolutely no clue where else to look at. I already did change every potential relevant setting I can imagine.

They also didn't loose a single word about the support file I send them. It would be really nice to know if they find any "bad" setting in there. That's what I asked them now.

I don't have the feeling they even had a look at the file I send to them. All these one line responses just give me the feeling they just write back to me, to have an update in the ticket...

Let's see what there answer regarding my support file will be. They had enough time to look at it, to take that into account. I'm doing well with 6.41.4 now on my devices. All up-to-date versions of current / RC / bugfix channels are pure cancer when i have them on my devices.
 
jarda
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Tue Jun 12, 2018 8:50 pm

What is your group key update time interval? What happens when you change it to 1hour?
Oh. You already did it...it helps to me always...
I have no other idea.
 
brg3466
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Wed Jun 13, 2018 7:34 pm

@Kerbia. do you get stable wifi under 6.41.4 ? If so, I probably want to switch back as well. The drop of Wifi due to this 'groupkey timeout" really bothered me. Hope that Mikrotik can do something about it and fix it.
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Sat Jun 16, 2018 11:52 am

Yeah, 6.41.4 runs stable for me. However, there is still the kinda weak throughput with this firmware. But at least it is quite stable.



Ping: Lenovo Y510 Notebook --> Mikrotik hap ac ^2 (6.42.3)
mikrotik_2.png
With 6.41.4 Firmware I have no timeouts, and the ping is between <1 and 1 ms.

Everything can be reproduced on cap ac.

Also: I believe more and more and this happens only at 2.4ghz.

@brg3466, Did you see any disconnects / group exchange timeouts on 5ghz?
Also: What wireless protocoll is selected in your settings? - Is it "any"?
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Last edited by Kerbia on Tue Jun 19, 2018 10:51 pm, edited 1 time in total.
 
Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Sat Jun 16, 2018 12:02 pm

Small impression of the router log, while having a phone connected (or disconnected!).
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Kerbia
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Re: hap ac^2 - Group Key Exchange timeout / No Reconnect possible

Sat Jun 16, 2018 12:13 pm

Having fun in the last 6 minutes:
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