Database Info

[Q] 802.11n network not visible -- Issues / how to debug ?

Hello all,
I have set up a 802.11n network in my Netgear WNDR4000 (European setting, channel 44).
Problem is that the network is not visible in my Transformer TF101G (Wi-Fi version v5.2.64, kernel v2.6.36.3-00004-g15c5e57).
I tried both open/unprotected and WPA2-PSK security but with same result. Even tried to add it manually, but not visible.
Network works fine in my Win7 laptop (but not in Galaxy S phone either)
Any suggestions / ideas on how to debug / fix ?
Thanks,
Florian
P.S. 802.11 b/g works fine.

Do you use the 5Ghz on wireless n? That is because the Transfomer does not support the 5Ghz. Try 2.4Ghz, that will work.

Thanks, that explains it
Gaah... Truely assumption is the mother of all ****ups. I was all the time under the assumption that 802.11 means 5 GHz -- and viceversa.
Thanks for pointing that out Pierre. Just another reason to look fwd to my next tablet (5GHz radio

5Ghz Wifi - "Authentication Problem"

Has anyone else had any problems connecting to wifi on the 5Ghz band? When I connect it goes like this:
Authenticating
Saved
Connecting
Authenticating
Authentication problem
I had the same problem with the Galaxy Nexus but I assumed that it was just because it was old. I would be tempted to say it might be a problem with my router but I have two Windows laptops which connect to the 5Ghz network flawlessly. When attempting to connect my phone to the 2Ghz it works fine.
My router is a new virgin media "Super router" with software version V1.01.26" and hardware version 3.11. My Nexus is the 32GB black from the UK playstore.
Is anyone having similar issues?
Thanks.

Same problem
I'm having the same problem. It's super frustrating. My friend had the same thing happen when he got his HTC One. He eventually had to buy a new router. My Router is brand new, so I would hope that its able to work, but so far no luck.

This is from the Nexus 4 forums, and this is how i get connected to 5ghz wifi on my nexus 5
Just a few facts about 802.11a/802/11n 5GHz. I have simplified things a bit since the detail is not important.
In many countries/areas of the world some of the channels in the 5GHz band used by 802.11a/802.11n are designated as
Dynamic Frequency Selection or "DFS". This means that these channels are shared with military/civilian radar and
perhaps other transmissions. As such any wireless 802.11a/802.11n device using those freqiencies is required to
detect a radar transmission on a channel it is using and switch channels in order to avoid interfering with ("stepping on")
the radar signal. The device may not return to the channel for 30 minutes. Most routers and wireless "cards" in
laptops/desktop computers implement this functionality. Many mobile devices do not implement such functionality so are
not allowed to use the DFS channels.
This creates problems if your router chooses to use a DFS channel and you have a device which is not allowed to use
those channels. The Nexus 4 and Nexus 10 devices fall into the category of devices which are not allowed to use DFS
channels. So if your router chooses to use a DFS channel the N4 and N10 will not see the router at all.
In the US (you can google to see the channel list throughout the world)
Non-DFS channels: 36, 40, 44, 48, 149, 153, 157, 161, 165
DFS channels: 52, 56, 60, 64, 100, 104, 108, 112, 116, 132, 136, 140
My router "likes" channel 132. I force it channel 44 so I can see it from my N10.
The N10 also implements 40 MHz bandwidth. That is what the 40 in MiMO HT40 specification means. It works very well
using 40MHz *if* your router handles it properly. I have seen some which do not. I do not know if the N4 supports 40 MHz
bandwidth or not. However if the router implements 40MHz properly then it can support both 20MHz and 40MHz bandwidth
devices at the same time. I have both on my router.
Hope this helps.
kees
source: http://forum.xda-developers.com/showpost.php?p=38254925&postcount=26

Solved
I got mine to work! I used the manual input for the wifi. I put in my network's name and password and it connected immediately. Hope it works for you too. :good:

I had this issue as well and had to change pre shared key type from ascii 63 characters to hex 64 on the router

[Q] No 5ghz wireless detection with Lollipop

Hi all,
Strange problem following my OTA lollipop update yesterday. My (UK WIFI version) Shield tablet is unable to detect my router's 5ghz signal. Kit Kat had no problems and all my other devices can still see it fine. I have also tried changing the settings on my router to see if Lollipop is more fussy about frequency/band etc, but still no joy
Anyone else having strangeness with this? Or is it just me?

ClownShoes said:
Hi all,
Strange problem following my OTA lollipop update yesterday. My (UK WIFI version) Shield tablet is unable to detect my router's 5ghz signal. Kit Kat had no problems and all my other devices can still see it fine. I have also tried changing the settings on my router to see if Lollipop is more fussy about frequency/band etc, but still no joy
Anyone else having strangeness with this? Or is it just me?
Click to expand...
Click to collapse
I flashed the US ROM last night, and during setup it took maybe an additional 20 seconds before the 5ghz routers (including mine) to show up in the list. 5ghz has always been kinda weird for me though. On a few occasions I've had to disable WiFi, wait 10 seconds, then restart so that the tablet will connect.

I also have the UK wifi version, and my tablet even connected first to the 5ghz network, I was actually surprised.

No issues here with 5ghz wireless.

pyro9219 said:
I flashed the US ROM last night, and during setup it took maybe an additional 20 seconds before the 5ghz routers (including mine) to show up in the list. 5ghz has always been kinda weird for me though. On a few occasions I've had to disable WiFi, wait 10 seconds, then restart so that the tablet will connect.
Click to expand...
Click to collapse
flakz0r said:
I also have the UK wifi version, and my tablet even connected first to the 5ghz network, I was actually surprised.
Click to expand...
Click to collapse
Thanks guys,
It's very odd, because I run wifi analyzer at home and it doesn't show my 5ghz network at all, yet in the office it does show the 5ghz one.
It was working before the update and all my other devices can still connect fine, so a real mystery

NZtechfreak said:
No issues here with 5ghz wireless.
Click to expand...
Click to collapse
Thanks. Does sound like just me then

Reboot the router?

I'm having this issue with my Nexus 4: http://forum.xda-developers.com/nexus-4/help/lollipop-5ghz-wifi-t2945330

Upon further inspection, it appears the only 5ghz channels that work are the first couple in band A (36 - 48) Nothing else seems to work.
Can anyone else confirm this behaviour? Try using a 5ghz channel other than 36 - 48
Band A : 5150 - 5350 MHz (channels 36 - 64)
Band B: 5470 - 5725 MHz (channels 100 - 140)
This is pretty rubbish if this is the case, as the band B channels allow a higher output and give me a much stronger signal in my house

ClownShoes said:
Upon further inspection, it appears the only 5ghz channels that work are the first couple in band A (36 - 44) Nothing else seems to work.
Can anyone else confirm this behaviour? Try using a 5ghz channel other than 36 - 44
Band A : 5150 - 5350 MHz (channels 36 - 64)
Band B: 5470 - 5725 MHz (channels 100 - 140)
This is pretty rubbish if this is the case, as the band B channels allow a higher output and give me a much stronger signal in my house
Click to expand...
Click to collapse
I can only connect when I use channels 36-48, Band A UNII 1. Can't even detect the AP with WiFi Analyzer on the shield if I go above 48.
Using the non-US 32GB LTE version in the EU, btw, same frequencies are allowed here as in the US.

debunk said:
I can only connect when I use channels 36-48, Band A UNII 1. Can't even detect the AP with WiFi Analyzer on the shield if I go above 48.
Using the non-US 32GB LTE version in the EU, btw, same frequencies are allowed here as in the US.
Click to expand...
Click to collapse
Sorry, you're right 48 does also work.
So that's confirmed then, they have for some reason heavily limited the 5ghz channel selection! I wonder why?
It's not a hardware limitation as it was working fine with KitKat, so I wonder whether it's possible to get the other channels unlocked?

Just to be sure, ClownShoes, does channel 140 work for you? I can't test this because my fritzbox router doesn't have an option to change channel width to 20MHz, and channel 140 isn't available to me for this reason.

Same problem for me here. No 5ghz detected when my Xperia Z1 Compact detect it . Even Wifi Analyzer can't see it . I restarted my tablet & stuff, nothin' . I'll try to make a nandroid backup, make a fresh install and I will see the result.

Same problem for me here with my samsung galaxy note 3 32 gb(sm-n9005). If I restart router phone view and connect to 5 GHz. When phone leave coverage are for same hours when come back don't see 5 Ghz wireless. This is strange because I have another phone with windows which work perfect. I will try to change wireless channel if don't work, I thing serious to go back at android 4.4.2
Update: I changed channel from auto to 48 and works.

Just dropping in to say I had the same issue: I had my router on channel 112 and the Tablet wasn't even seeing it.
Switched to 48 and everything works fine now.

Same issue here, hoping Android 5.1 fixes this silly issue. I was wondering why i couldnt see the 5Ghz network at channel 140, 80mhz. had to bring it down to channel 48.

US wifi version here. 5.1 Lollipop, stock rooted.
I can connect to channel 149 with turbo mode (40MHz channel width) & the upper Extension channel, but WiFi analyzer shows my router is broadcasting on channel 153. I tried so many other channels & combinations but this is as high up as I could go & have the tablet connect. It did, however, see channel 161 but got an authentication error & wouldn't connect with the router.
So, back to 149. The signal is slightly stronger & have better throughput than channel 48!
On a side note...I use 5GHz here in this LARGE apartment complex because everyone here is on Verizon FIOS or Cox Communications, so Wi-Fi Analyzer sees 17 (give or take a few for signal strength or weakness) access points around my place & the 2.4 band is completely choked up! There is only 1 other router close by on 5GHz, so using that band is the only option for wireless internet here. I don't use Verizon's wireless AP. They only have 2.4 wireless, no 5. My Netgear simultaneous dual band router is plugged into the back of their cable modem & my Netgear is on 192.168.2.1. That way I can use DD-WRT & my own router instead of theirs for wireless. Easy-Peasy!:good:

I have the same issue. After switching my channel from 100 to 40 the 5GHZ wifi showed up on (two) shield tablets just fine

I believe the SHIELD Tablet only supports United States Non-DFS channels, so 36-48 and 149-165. I personally have mine on Channel 149 and 80MHz bandwidth.

Android 9 (Oxygen 9.02) wifi keeps switching between 5ghz and 2.4ghz connection

Hey everyone,
So I've been expernecing this problem for over month. Basically im connected to my wifi on 2.4ghz and suddenly my connection will drop and I check that its now connecting to 5ghz but it doesn't actually connect to it its just keeps connecting and disconnecting every second until it finally connects back to 2.4ghz. And then after few minutes of strong connection ill drop again and same thing.
Im only experiencing this at work. There isn't 2 different ssid for 5ghz or 2.4ghz just one ssid, I was able to find out that they are using dual band router so I can't change anything the router part. is there an app or some setting I can toggle with to enforce 2.4ghz band only? Ive already turned off smart switch and scanning but problem still here.
Thanks in advance!!

Force wifi to connect to only 5ghz

i am using a router which broadcast both 2.4ghz and 5ghz band using single SSID. how do i force my phone to only allow to connect to the 5Ghz wifi network. i cannot turn off the 2.4ghz band as there are other devices in my house that only support 2.4ghz or do i want to split the bands into 2 SSID.
Thank you.

i was able to split my router to 2 different SSID for both bands

In the past there used to be an option in advanced wifi settings that made the 5GHz "preferred" but Google took it out for some reason.
The disabling of the 2.4 GHz or having 2 separate SSIDs might be the only way right now (not sure for a rooted phone tho)
Sent from nowhere over the air...

Yes not sure why did Google remove that option. Any hidden secret code i.e. *#00*# etc that allowed us to make changes to network setting.

Some routers have band steering which will force devices to 5ghz if supported while keeping 2.4ghz for devices that can't.
Sent from my SM-N986U using Tapatalk

I turned off Auto Connect on my 2.4ghz, so it stays on 5ghz all the time.

Eagle 3 said:
I turned off Auto Connect on my 2.4ghz, so it stays on 5ghz all the time.
Click to expand...
Click to collapse
Mine only 1 ssid for both band. Seem like there is no solution and i had to split the bands into 2 ssid.

angka8 said:
Mine only 1 ssid for both band. Seem like there is no solution and i had to split the bands into 2 ssid.
Click to expand...
Click to collapse
I only have 1 ssid. Like I said, I turned off Auto Connect for 2.4ghz so it always stays on 5ghz.

Eagle 3 said:
I only have 1 ssid. Like I said, I turned off Auto Connect for 2.4ghz so it always stays on 5ghz.
Click to expand...
Click to collapse
thanks, but for me both the bands are broadcast into one SSID. which means i can only find one wifi connection and the wireless router will change the band connection based on the signal strength when i am moving around the house. it will change the connection to 2.4ghz when i am in some place where the 5ghz connection is weak. why i wanted to stay with 5ghz when the connection is weak because it give a much higher download/upload speed compare to the 2.4ghz connection which somehow got much weaker internet speed to the extent of unusable.

angka8 said:
thanks, but for me both the bands are broadcast into one SSID. which means i can only find one wifi connection and the wireless router will change the band connection based on the signal strength when i am moving around the house. it will change the connection to 2.4ghz when i am in some place where the 5ghz connection is weak. why i wanted to stay with 5ghz when the connection is weak because it give a much higher download/upload speed compare to the 2.4ghz connection which somehow got much weaker internet speed to the extent of unusable.
Click to expand...
Click to collapse
Buy a new router where you can separate them and then disable or turn off the 5ghz connection

Looks like this is quite an issue for N2Us. I have a 4 year old iphone and it stays connected to 5GHz in the same place and N2U reverts to 2.4. I have band steering and have been really well on all other devices. Issue lies only with N2U.

Snowleopard1900 said:
Buy a new router where you can separate them and then disable or turn off the 5ghz connection
Click to expand...
Click to collapse
Mine can separate them but since it is only affecting my phone, I hope the change can be on the phone instead. By separating them, I will need to configure all those devices that can only connect to 2.4ghz. e.g. ring peephole

Did you solve issue? Same problem here :/

Eagle 3 said:
I only have 1 ssid. Like I said, I turned off Auto Connect for 2.4ghz so it always stays on 5ghz.
Click to expand...
Click to collapse
Errr...you actually DON'T have one SSID but 2. The band is appended on the name and they are actually 2 different WiFi networks with different names so you could turn off auto-connect on the 2.4GHz one

I use the Wireless Mac Filter on my router to block 2.4Ghz Band for my phone mac address, so the phone can only connect to 5Ghz

If you are using a Samsung phone in the advanced settings for wifi, turn off use randomised MAC address and use the phones actual MAC. This fix has been tested on Netgear routers and works, phone will join the faster 5ghz and still be able to switch to 2.4 if you are at a distance from the router

SenatorDC said:
If you are using a Samsung phone in the advanced settings for wifi, turn off use randomised MAC address and use the phones actual MAC. This fix has been tested on Netgear routers and works, phone will join the faster 5ghz and still be able to switch to 2.4 if you are at a distance from the router
Click to expand...
Click to collapse
Thanks, this worked with Pixel 4a on ruckus WiFi as well!

angka8 said:
i am using a router which broadcast both 2.4ghz and 5ghz band using single SSID. how do i force my phone to only allow to connect to the 5Ghz wifi network. i cannot turn off the 2.4ghz band as there are other devices in my house that only support 2.4ghz or do i want to split the bands into 2 SSID.
Thank you.
Click to expand...
Click to collapse
This is what i did .
(It might give you an very easy option /idea .)
My current setup is a Nokia fibre router that has 2.4 ghz and 5 ghz bands
I bought a reasonable priced wifi mesh 'TP DECO M4 "then
connected it to my fibre router ( ethernet cable )
The TP wifi mesh comes with an Android app fo configure it (settings )
All i did was swicth off the 2.4 ghz band in app, for my TP decom 4 model .
So if i wand to use only 5ghz i connect to my TP DecoM4 ( which is connected to my Nokia fibre router)
My othe devices( that only use 2.4 ghz bands ) i connect dirrectly to my Nokia fibre router, that has 2.4ghz band active ...and also the 5ghz ,
So fo me its a matter of to switch 2.4 ghz on and off in the Android TPlink app .
Hope this give you an very straightforward option ?
good luck
see screenshots below

Hi...
I don't if you already solved you problem but, probably, if you have router which broadcast both band with the same SSID you have option, in router settings, called SMART CONNECT set to the "ON"...

I found a solution that worked for me, i am using a xiaomi router and a s21
Samsung S21 Ultra 5G not connecting to 5Ghz wifi channel
Hi folks . I have a Samsung s21 ultra 5g. I can connect to the 2.4ghz WiFi but more than often I can't seem to connect to the 5ghz wifi channels .I'll have my laptop right infront of me onnected to the 5ghz wifi channel , yet my phone won't be able to the same. My router is netgear nighthawk...
eu.community.samsung.com
"in the settings of your phone / Connections / Wifi / settings of your network put:
IP-DHCP Settings
Phone MAC-MAC address type"