Chromebook Network not available after logout

[James Dazley]

We have a batch of Acer c720p's, when you power up the device, it connects automatically to the wifi that is pushed out via policy, the chromebook logs in and everything is normal. If the user signs out, the wifi disconnects and then tries to reconnect, it connects, but comes up with a screen that says network not available. If I disable the wifi and re-enable it, it's fine. We have 400 acer c710s that have the same policy, but do not have the same problem.

Also, while the machine is logged in, if I go in and delete the address from the dhcp server, then logout, it works as expected.

Any ideas?

THanks

[Will Welch]

Were having the same issue with our c720s. I haven't had time to look into it. I am hoping it'll be fixed with an update.  For now, I am just telling users to restart the device.

- Will

[Watson, Branden]

We had that same issue with our HP Chromebooks. Once we upgraded to version 32 the problem went away. 

Branden

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Branden Watson
Amherst Technology
(716) 362-3037
bwa...@amherstschools.org

[John Fano]

We're looking to purchasing 1,100 C720's next week, so this is not good to hear.  We currently have 1,100 Samsungs that are having WiFi troubles (junky WiFi cards).

Are your WiFi settings in the user policy or the machine policy?  We had ours in the user policy when we first got them last year and had the same kind of behavior that you are describing.  I talked with Google support and they said never put WiFi settings in the user policy.  Which begs the question as to why those are available in the user policy.  Once we moved them over to the machine side, it worked much better, excluding the fact that they have junky WiFi cards in them to begin with ;-)

John :-)

https://www.linkedin.com/in/jfano
-----------------------------
John Fano
Systems Administrator
North Canton City Schools
jo...@northcantonschools.org

330.497.5600 x309
-----------------------------
"Well, we'll not risk another frontal assault. That rabbit's dynamite."
         - King Arthur, "Monty Python and the Holy Grail"

[Jim Flanagan]

John

Can you tell me more about the junky wifi cards. I recently worked with a school district that had ongoing problems with Samsung Chromebooks and wifi.

Has Samsung provided and support for this?

Thanks

Jim

Jim Flanagan
Chicago: 773.463.5494
4439 N California 60625
Beaver Island: 231.448.2109
37700 Font View Court 49782
Cell phone: 773.396.4638
Email address: Jhfla...@gmail.com
                       - - - - -

You can't really predict the future. All you can do is invent it.
FREDERIK POHL

[Sean Eisner]

I will have quite a few 720's coming in too. I have no problems with any of existing machines, which are a mix of 550's, HP's, and Samsung 3 series. When wi-fi was not cooperating very well early on, I realized that I had the wi-fi settings pushing out for both user and machine. Google support told me that either one would work, but to not have wi-fi settings set up for both. I was still learning (and still learning) the admin console...features keep showing up.

Since I only set the network settings via the machine, things are fine.

Sean

[Mattix-Wand, Gerry]

We haven't had very many problems with WiFi on our Samsung Series 3 Chromebooks.  I'm curious as to your experiences that are negative.  I set the WiFI when I enrolled all of them rather than pushing it out with a policy, but we very rarely have chromebooks drop off the network unless they are in a marginal area of our building.

-gerry

Gerry Mattix-Wand
Director of Educational Technology
East Alton-Wood River H.S.
Wood River, IL 62095
(618) 254-3151 x2555

[James Dazley]

Thanks for the suggestions, I do have it only set for for device.

 

James Dazley

Interim IT Director

Bedford Public Schools

734-850-6091

419-279-5041

james....@mybedford.us

[James Dazley]

After further investigation, I can break my c710s that are in my 1:1 program by putting it in the same ou as the 720s, the difference in the ou's is my training ou is set to erase all local user data, like below: It looks like the standard login page with the username and password times out before the wireless network re-connects.

User Data Locally applied

Erase all local user info, settings, and state after each sign-out

 

James Dazley

Interim IT Director

Bedford Public Schools

734-850-6091

419-279-5041

james....@mybedford.us

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[John Fano]

We've tried to get Samsung and Google involved.  Samsung pretty much blew us off.  We had an open ticket with Google, but they wouldn't answer any questions we had as to how the NIC worked or what settings it had in the firmware.  They ended up closing the ticket with no resolution.

Basically the Samsung's have some no-name WiFi card in them.  The main problem seems to be with their roaming aggressiveness.  Here is a list of things that we've observed.  We've also hired Technology Engineering Group (TEG - http://www.tegoh.com/) to help us with the diagnosis.  CDWG, who we bought them through also sent their own network eng. to take a look and he observed the same thing.

- They don't want to connect to the 5 band unless you shutdown all 2.4 bands in range.  We can't do this because we still have 2.4 band only machines in service.

- When only one AP is in range they will continually associate and disassociate from them.  Some times as much as 10-12 times per second.  We can see this in the AP logs.  This of course leads to dropped packets and the appearance that they have dropped off the network

- When more than one AP is in range, you can watch them bounce around between the APs, also sometimes as much as 10-12 times per second.  Again this leads to dropped packets and the appearance that they have dropped off the network.

- In rare cases they actually do drop off the network.  They "lose" their WiFi settings, even though you can still see the correct settings in the Preferred networks section of Chrome.  When this happens we have to reboot them.  When they come back up they usually prompt for the WiFi password even though it's a remembered connection and the password is in the management console

- We are constantly performing a firmware resets on them because at random they will stop processing the machine policies.  We've not found a way to force them to refresh such that it pulls in the machine policy again, other than the factory reset.  I dunno if this one is a Samsung problem or a Google problem.

All of this combined results in a terrible user experience.  The Chrome 31 update brought some changes in that seemed to help them settle down and roam a tiny bit better, but it's still a problem.  We're all Meraki here for APs, and Meraki as well as TEG has observed this behavior in their test labs with their own Samsung's.  We've even tested pre-alpha AP firmware from Meraki to help them play with settings to see if they can "fix" the issue on the AP side.  While the pre-alpha firmware helped the drops and getting them onto the 5 band, it wasn't enough to make a difference.

In addition to the WiFi issues, the Samsung's, have not held up well to everyday use and abuse.  They seem to break very easily.  We've replaced many screens, keyboards, cases, etc., and that's with hardshell cases on them.

For this round we demoed both the HP and Acer Chromebooks.  We settled on the Acer because the HP currently doesn't have a user replaceable screen, and only a 4-5 hour batter life.  Now, I dunno if we'll move forward with the Acer's.

John :-)

https://www.linkedin.com/in/jfano
-----------------------------
John Fano
Systems Administrator
North Canton City Schools
jo...@northcantonschools.org

330.497.5600 x309
-----------------------------
"Well, we'll not risk another frontal assault. That rabbit's dynamite."
         - King Arthur, "Monty Python and the Holy Grail"

[James Dazley]

I would encourage you to look seriously at the dell 11" chrome book. We decided to go with them after seeing how much better they are assembled and the have a protective plastic over the LCD. Really nice machine.

James Dazley
Interim IT Director
Bedford Public Schools

4192795041
James....@mybedford.us

[John Fano]

Thanks for the tip.  I will check them out. ;-)

John :-)

https://www.linkedin.com/in/jfano
-----------------------------
John Fano
Systems Administrator
North Canton City Schools
jo...@northcantonschools.org

330.497.5600 x309
-----------------------------
"Well, we'll not risk another frontal assault. That rabbit's dynamite."
         - King Arthur, "Monty Python and the Holy Grail"

[Jeff Li]

I can say that Dell would have better Tech Support than most other PC vendors.

[John Fano]

I agree with that.  We've always had excellent support from Dell.  I wish I could say the same for other MFGs.  

John :-)

https://www.linkedin.com/in/jfano
-----------------------------
John Fano
Systems Administrator
North Canton City Schools
jo...@northcantonschools.org

330.497.5600 x309
-----------------------------
"Well, we'll not risk another frontal assault. That rabbit's dynamite."
         - King Arthur, "Monty Python and the Holy Grail"

[Chris Franzen]

Thanks for the detailed share.  I just got 11 of the brand new Samsung Chromebooks to try out here with some small pilots. Initial thoughts:

The keyboard doesn't feel quite as nice as the Acer 720's.

The topside canvas does give you some extra gripping. 

Although I prefer the "generic" usb / droid power adapter, this 1 does seem to be well made.

Gives me an initial feeling of durability granted I know it won't take a fall like Intel NL2 clamshell netbook, whose screens would still break.

Seen a little bit of initial flakiness with the wireless, hopefully that isn't a sign of things to come.

--

Chris Franzen

chrisf...@nokomis.k12.il.us  

Technology Coordinator | Nokomis School District

511 Oberle St. | Nokomis, IL  62075

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