[Q] Why does JB 4.1.2 not connect to wifi properly??

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asifanwaruk

Senior Member
Feb 22, 2012
54
18
Hello all. I have been playing with the new 4.1.2 JB ROMs on my 7100 Note2 and have been having one major and repeatable issue, that I have seen mentioned a few times by others, with no obvious resolution.
I have tried the various leaks of the 4.1.2 that were floating around (the stock one, Wannam and Android Revolution HD 5) and now I have just tried the final Polish PLAY version of 4.1.2 as well as the latest Wannam as well. All do/did the same thing:

They can see my wifi SSID and they can BEGIN to connect and "obtaining IP address" comes up. EITHER they then fail and tell me connection is poor and to try again, or they will connect and then drop within a minute. Just today I made some kind of movement on this by trying different kernels. Perseus25 gives up and tells me signal is poor. Perseus27 WILL actually connect and stay connected but can never actually surf anywhere. Note2Core will either connect or tell me my authentication is wrong (which it isn't) and when connected, it too refuses to surf. RedPill is same as Note2Core. BTW, even when they DO connect, they do so at a measly 5Mbps (and cant find internet)

Now, you are all probably thinking "his wifi is rubbish!" but I REALLY cant see how that can be! Firstly, there are other users out there who have mentioned this in a few threads but I have never seen any useful replies as to a solution (or a cause!). But also, if I restore back to my usual ROM which is Android Revolution 4.1 HD (=JB 4.1.1) with a perseus25 kernel, then I connect immediately and stable at 54Mbps and works great. (all it takes is a CWM restore back and it is working 100%. same location in my office, same router, wifi etc!) Plus same wifi serves two laptops, wife's Galaxy S2, and has seen many iphones, ipads, and other laptops all fine.
Back in the days of the leaked 4.1.2 I DID try jumping wifi channels on the router just to prove a point. Every single one did same thing.

Flashing procedures have been the 'standard' method: boot into CWM, wipe data/cache/dalvik/battery, then flash new ROM, boot OK.

I had assumed that the early leaked version of the ROM had some bug but very disappointed to find same behavior in the Polish PLAY version which is final release AFAIK. It makes all these subsequent ROMs based on it totally useless to me.

I even extracted and flashed the modem.bin from my working ARHD4.1 ROM but nothing changed. So modem and kernel same as working systems but something clearly broken somewhere.

If you are one of the other folks out there who also has this issue, might be helpful if you give some info about your setup, so somebody clever out there can help us join the 4.1.2 club?!

Any thoughts?

(setup: UK VirginMedia 120Mbps down/10Mbps up. Cisco Linksys E4200 router. about 10 feet from router with one 'paper wall' between! ARHD4.1 finds full signal and surfs fast. 4.1.2 totally unusable)

Help me Obi-Wan Kenobi(s), you are my only hope!
 

-Sn1PeR-

Member
Sep 18, 2012
26
4
I have noticed similar problems on my SGH-i317 using CleanROM 3 (4.1.2). The wireless connection randomly drops while browsing. This happens even in areas with excellent signal quality.
 

asifanwaruk

Senior Member
Feb 22, 2012
54
18
I have noticed similar problems on my SGH-i317 using CleanROM 3 (4.1.2). The wireless connection randomly drops while browsing. This happens even in areas with excellent signal quality.

Thanks for contributing. Helps prove the point that it is something in the new ROM as our wifis are fully functional otherwise. I have matched the modem and kernel from my working 4.1.1 system and still failing....

I hope we get some help.
 

hendry

Senior Member
Feb 29, 2004
309
19
Jakarta
I also got this problem from latest WanamLite & Omega ROM. Both are using 4.1.2 JB.
Wifi detected and connected but always obtaining ip address..
Sometimes it tooks so long and can get ip, but still cannot access internet or can't even ping different ip address from the same network.
 

Lostamasta

New member
Nov 22, 2012
2
0
Makassar
I also got this problem from latest WanamLite & Omega ROM. Both are using 4.1.2 JB.
Wifi detected and connected but always obtaining ip address..
Sometimes it tooks so long and can get ip, but still cannot access internet or can't even ping different ip address from the same network.

strange, i've been running omega 7 to 7.4 but dont have any problems with wifi.
i've connected to home wifi (TP-Link), workplace (Cisco/Linksys) and some coffe-shops without any problem.
most of them using WPA2 or WEP. sometimes obtaining ip address with WEP could take a lil longer about (10-15sec) but always a success.
but never used wanamlite for my note2 so cant comment any, srry
 

adytum

Senior Member
Jul 1, 2011
1,018
275
I'm not saying the issue is in the wifi itself, but it can probably be fixed by disabling n mode and only using b and g. Also try to make sure the phone gets assigned a static ip.

Issue seems to be 4.1.2 related.

Sent from my GT-N7100 using Tapatalk 2
 

mojackoz

New member
Aug 23, 2012
4
0
Kuala Lumpur
yes.. i'm also facing the same problem.. whenever i flashed custom rom based on 4.12, like wanam 2.0, 2.1 n crash rom, i cant connect to the wifi.. it always shows optaining ip address and it never connected.. now i m using stock rom 4.11 n there is no problem to connect to the wifi..
i juz wonder why it happens to several devices only?
 

asifanwaruk

Senior Member
Feb 22, 2012
54
18
I have tried switching OFF the 5GHz signal from my modem and sticking to 2.4GHz.
Have also tried turned off N and locked it down to just B & G.
Have tried turning off the WMM in the QoS section.

All of these have been mentioned around the place as possible solutions, and I am afraid none of them changed anything at all for me. Also read that one person had his wifi issues resolved when he dropped WPA2 security and went back down to WEP. This is an unacceptable solution to me as I don't want to make my WiFi so insecure, and also, what happens when I go to my friends and family who all (rightly) use WPA2?! So wont even be trying that.

I am actually getting a new Virgin Media Superhub in about 2 weeks so will revisit the issue then to see if 4.1.2 just doesn't like my Cisco router.
Just weird. And frustrating as wanted to move on to 4.1.2!
 

slimpyman

Senior Member
Nov 30, 2008
106
6
arlington heights, il
Ok. I here is my evo 4G lte story. I flashed cm10 as soon as I got this phone a month and bit ago. I totally had wifi connectivity problems at work and at my house. One worked better and one had to be spammed to connect 20 times to connect and would still occasionally drop. I went to sense is from there and found it to be reliable. Though I just moved to the ota, I find this sense to be just as reliable.

In all. The new ota let me move to jb with reliability.

Sent from my EVO using xda app-developers app
 

mojackoz

New member
Aug 23, 2012
4
0
Kuala Lumpur
I dun think it is about router.. because with 4.11, I found no problem to connect.. when I use 4.12, I cant connect to any other wifi network..

Sent from my GT-N7100 using xda app-developers app
 

hendry

Senior Member
Feb 29, 2004
309
19
Jakarta
Why not all people getting this wifi problem using 4.1.2 ROM? Does the device something problem? But why going back to 4.1.1, wifi problem dissapeared and can connect directly?
Really2 weird....

Sent from my GT-N7100 using xda premium
 

kobykoby

New member
Dec 15, 2012
2
0
I also have exactly the same problem. I have tried every single 4.1.2 ROM but I can't keep my wifi working. I have had to go back to 4.1.1 as well. My wifi is perfect on 4.1.1. I use Cisco e4200 with ddwrt flashed. Very frustrating!
 

adytum

Senior Member
Jul 1, 2011
1,018
275
Try changing channels to below 11 if you're in Europe and the router uses channels above.

Sent from my GT-N7100 using Tapatalk 2
 

gee2012

Recognized Contributor
Jul 13, 2010
11,140
4,166
Heerlen
I`am on ARHD 6.0 currently and i never had problems with wifi on all the previous ARHD rom`s. Try doing a full wipe or at least also do a system wipe (and wipe cache/dalvik cache, data/factory reset and format preload) before flashing a rom. I`am sure that will help guys.
 
Last edited:

kspsp

Senior Member
Oct 10, 2007
50
31
i have same problem no ip adressing and when i set statique ip no internet
i test Omega wanam mondx... same issue
omega 6.1 works great but at 7 version no internet by wifi, but ok in data
i have a logcat if help (catlog app)
i test rest router, change wpa2 to wpa, change channel, wps, super wipe (allll format) every omega rom, set mac adress in router with static ip
i become crazy why not on all device its n7100 XEF french buy on amazon

Sorry for my poor english
 

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  • 4
    For all having issues with Wifi stuck at Obtaining IP address, replace the Wifi folder from /etc/wifi/ from Stock ROM to Wifi folder to /etc/wifi/ in Custom Rom and Reboot.

    Download these folders from http://db.tt/FahyznES

    Hit thanks if the post helped you..

    Sent from my GT-N7100 using Tapatalk 2
    2
    How do we revert to 4.1.1 drivers? Is that possible? Thanks

    Sent from my GT-I9300 using Tapatalk 2

    Hey guys,

    This actually worked for me!!! However, since the dropbox link no longer works, i was forced to 'unbrick' my device (nothing was bricked, but that seems like the cleanest way of restoring your phone to factory settings) using 2nas Android flash tools, than i rooted my phone using Galaxy note2 toolkit (I went for TWRP recovery, SuperSU). Afterwards i installed ES File explorer and went to etc folder to look for wifi subfolder (of course, mount system files under root settings was a must). I copied it to my external microSD card just in case and flashed Revolution HD 10.0 after a full wipe. Since ARHD 10.0 already has ES File Explorer, i just set mount system files, went to my microSD, copied wifi folder, went all the way to system files, found etc folder, paste and reboot. after that my phone connected in less than a second.

    In case you don't want to trouble yourself with all this, try using my wifi folder from etc phone folder.

    https://www.dropbox.com/sh/8kjh0aw8hj2a4yr/Sgh3EEg0jc


    In case this helped, pls press THANKS button:)

    Regards