Wifi 20/40Mhz Channel Doesn't Work? - Galaxy S II Q&A, Help & Troubleshooting

I have a ASUS RT-N66U and I can't seem to get WiFi working on the SGS2. If I switch channel bandwidth to 20Mhz, it connects fine. If I use the settings in the screenshot, then it won't work.

Try your GS2 on a different wifi, preferably a open pulic wifi in a cafe or restaurant. If it works then the issue is not phone related and you'd need to focus on the router settings.
Sent from my digital submersible hovercraft.

It is a SGS2 problem. My Optimus G is fine with the settings in screenshot.

I have SGS II and a same router with the same setting and I have no problem.

happens to me when switching between kernels.
try this:
on router - change the name of the network
on phone - forget network and reapply
(I had problem with WPA2 and dori, so maybe try to change the authentication)
(leave the control channel to auto)
hope this help

Seems that it's not connecting to public WiFi as well.. It works, then doesn't. Guess my sister didn't use the public WiFi long enough to give it a chance to break last time.

I also have this issue on my old S2. Any suggestion would be greatly appreciated as my wife seem to have a lot of issue using fat channel lately. Used to work fine earlier with my Dlink 2750u router with 20/40MHz option, not sure what has changed now. And is it just me or the S2 doesn't use fat channel even on 5GHz Band as I observe (still connects at 65Mbps instead of the usual 150Mbps on my Note 2).

Related

Hero's Wifi problems

Hi,
so kernel sources are released. Is there any fix for hero's wifi problems? I mean dropping connection to AP. It is so annoying, I tried to do everything: change channel, mode, encryption... Nothing helped. It is Linksys wrt160nl. The same applies to other networks (some public hot spots).
I never had this problem with my Linksys WRT54GL...
mopodo said:
I never had this problem with my Linksys WRT54GL...
Click to expand...
Click to collapse
Could you paste your wifi settings? (mode, encryption mode, channel)
Using the Modaco custom ROM 2.8 (never had problems with modaco ROM and generic)
Router: Linksys WRT54GL running Tomato 1.25 firmware
Wireless Mode: Access Point
B/G Mode: Mixed
Channel: 1 - 2.412 Ghz (try a free one)
Security: WPA / WPA2 Personal
Encryption: AES
Group Key Renewal: 3600 seconds
No Mac Filter
Under Advanced Settings I changed "Transmit Power" to 251mW for a better signal, the rest are default values.
Try to update your router firmware
Are you alone with this problem?
greetz
In case you haven't done so yet. Check out the Wifi Sleep Policy (access by pressing menu when you are in wifi menu). Normally the Wifi is turned off then the screen is turned off which can cause problem.
Similar problem with netgear wnr2000
mopodo said:
Using the Modaco custom ROM 2.8 (never had problems with modaco ROM and generic)
Router: Linksys WRT54GL running Tomato 1.25 firmware
Wireless Mode: Access Point
B/G Mode: Mixed
Channel: 1 - 2.412 Ghz (try a free one)
Security: WPA / WPA2 Personal
Encryption: AES
Group Key Renewal: 3600 seconds
No Mac Filter
Under Advanced Settings I changed "Transmit Power" to 251mW for a better signal, the rest are default values.
Try to update your router firmware
Are you alone with this problem?
greetz
Click to expand...
Click to collapse
Hi got similar problem with my router netgear wnr2000.what i found funny is that when i reset the router, the phone connects perfectly to the router, but after abt 24hrs or so, it fails to connect.even if i reboot my phone, or reset the connection on phone.fails to connect.it will only connect when i reboot the router. i will try the 'aes' encryption n see if that helps.will update if it works
Thanks for your replies. Please could other members share their experiences, used options and solutions. This issue is too common to simply forget it. I am trying to find some kind of pattern or special options, it requires.
i dont have a problem with wifi apart from the wont find or connect to n-range device other wise i use wifi all the time it never drops, on stock orange uk firmware
I have a Sitecom WL-173 router.
I cannot connect at all. I can, but only with no or WEP security. That is no option for me.
When I use WPA or WPA2 my Hero does view my network, but does not connect.
I called HTC about this problem. He told me that they do not support all routers. He could not tell me which they support and which not.
mopodo said:
B/G Mode: Mixed
Click to expand...
Click to collapse
I also have the same problem. The way to solve it is to change the above setting to 'G' only. Not mixed/Hybrid.
Cheers!
I have not had any problems trying to connect to WiFi networks, until i went over to my mates place where he has the Virgin 50MB B-Band and also a D-Link wifi-N router, and my Hero could no see the network at all, even though his iPhone connected straight away.
markoc84 said:
..., even though his iPhone connected straight away.
Click to expand...
Click to collapse
Augghhhhh... that hurts. Please, do not curse in this forum
tembares said:
Augghhhhh... that hurts. Please, do not curse in this forum
Click to expand...
Click to collapse
I'm sorry, it hurt even more when i was sitting there pissed off that my Hero wouldnt connect to the Wifi!!!
I have Virgin 50meg at home no problem at all, went to my GF's who has basic Virgin cable 10meg on netgear G and would not connect at all.
No idea why, as it should be all fine!
I have the same problem. It is so ****in annoying. My router is a Linksys WRT54G with Tomato firmware v1.25. Router is in "G only mode", WPA-2 PSK-AES security, I've set a static local IP for the phone, the phone's wireless is set to always ON... I basically tried everything I could think of. Ended up rooting the phone and installing Modaco 2.9... but didn't change anything. The only way I can get it work again when it drops is shut the Wi-Fi off then on...
Worst of all this is the problem seems widespread (but not universal)... What the **** does HTC think putting a ****in smartphone on the market with defective Wi-Fi... This is non-sense.
I really hope someone comes up with a fix or HTC updates this... otherwise we might want to start thinkin bout class action.
[email protected] said:
I also have the same problem. The way to solve it is to change the above setting to 'G' only. Not mixed/Hybrid.
Cheers!
Click to expand...
Click to collapse
Is it a router setup or a Hero setting?
Pleaes explain if it's one of the options
probs here too ...
Linksys WAP54G v3.1
vs
HTC Hero
was working perfectly for first month or so, but has been getting worse and worse. ie, for a few weeks it would see the wifi but would usually fail to connect. now I'm lucky if it can see it at all!
have reflashed the wap with dd-wrt and experimented with a lot of settings. no diff.
have reflashed the hero with hero21 comunitry v1.6. no diff. (and also latest radio)
it just starts and stops when it feels like it.
oh, and my eeepc works fine on the same wifi, so I know it's not some wap screw up.
tried every tip I can find like 'use mixed mode' or 'g only', etc etc.
I am starting to think it's a hardware fault?
Same problem
Siemens Gigaset Tiscali modem with wpa psk2 tkip and T-mobile hero rom.
Sees the modem and connects with security first time but then says 'remembered out of range' on wifi settings but interestingly in wifi buddy it constantly has the syncing symbol next to the network.
Really annoying.
I've tried WEP and security off, wireless g only etc etc.
I have problems too but seems different to yours... but who knows : in fact i can't connect to wifi when the SSID is masked. Even if - or course - i put manuualy the ssid before with the good wep key. It happens on a livebox ( orange box )... but if i press the button to show the wifi network - it has to be made when you connect a device for the first time on this box - then it connects to the network... else it tells me that the network is out of range...
So does the wifi on hero has problem with masked SSID ? To compare i never had this problem - on the same box - with the touch diamond and the touch hd... and at home, not masking the ssid, the connection is ok without doing anything.
Ciao
Fred
I had the same problem with a Zyxel 660 router. I was able to connect to the wifi (WPA/PSK enable) but there was no data transfer possible.
So I updated the Radio ROM to the 63.18.55.06JU_6.35.08.29 version and it solved the problem.

[REQ] How to disable 802.11n WiFi

Following on from my investigations on why the SGS2 takes *so" long to re-establish a WiFi connection, it now seems part of the problem is a major delay in obtaining an IP address.
In another thread (I forget which one) it was suggested that slow WiFi could be caused by a router not being able to cope with 802.11b, g & n traffic at the same time, which got me thinking - what if I disable the n part of the WiFi on the phone to revert it to 802.11g - would this make acquisition time on an older router faster?
So - does anyone know which file / script etc. could be altered to keep WiFi enabled, but ONLY at 802.11g; not utilising 802.11n?
stuclark said:
Following on from my investigations on why the SGS2 takes *so" long to re-establish a WiFi connection, it now seems part of the problem is a major delay in obtaining an IP address.
In another thread (I forget which one) it was suggested that slow WiFi could be caused by a router not being able to cope with 802.11b, g & n traffic at the same time, which got me thinking - what if I disable the n part of the WiFi on the phone to revert it to 802.11g - would this make acquisition time on an older router faster?
So - does anyone know which file / script etc. could be altered to keep WiFi enabled, but ONLY at 802.11g; not utilising 802.11n?
Click to expand...
Click to collapse
Just a guess, but is likely a build.prop tweak
Is this a frequent problem ? Has never happend here
Sent from my GT-I9100 using XDA App
As I've said in my post on the general forum, I get a horrible delay every time I ask the phone to connect WiFi.
I've got the WiFi sleep policy set to "when screen turns off" to save battery power; and using the same router as on my SGS (hell, i can sit the phones next to each other to try this) I get the following:
Waking the SGS up from a sleep results in a delay of 1 or 2 seconds before WiFi connects.
Doing the same with the SGS2 results in a delay of up to 1 minute before WiFi will connect. (sometimes it can be seen to give up trying to acquire an IP address, then try again)
...so yes, may be a router issue, but clearly there's something different between the 2.3.3. on the SGS versus the 2.3.3 on the SGS2 as well.
You could just disable n mode on your router if you think mixed mode is slowing it down. Most new routers will let you choose which wifi modes to broadcast via their web interface. The best option would be to only use n if all your devices support n.
Sent from my GT-I9100
Router only supports g. I'm suspecting the phone looks to n first, hence my interest in disabling it.
stuclark said:
As I've said in my post on the general forum, I get a horrible delay every time I ask the phone to connect WiFi.
I've got the WiFi sleep policy set to "when screen turns off" to save battery power; and using the same router as on my SGS (hell, i can sit the phones next to each other to try this) I get the following:
Waking the SGS up from a sleep results in a delay of 1 or 2 seconds before WiFi connects.
Doing the same with the SGS2 results in a delay of up to 1 minute before WiFi will connect. (sometimes it can be seen to give up trying to acquire an IP address, then try again)
...so yes, may be a router issue, but clearly there's something different between the 2.3.3. on the SGS versus the 2.3.3 on the SGS2 as well.
Click to expand...
Click to collapse
quick side note, wifi sleep policy set to NEVER saves you much more battery power because when it switches over to 3g, 3g uses way more power than just leaving it on wifi. counter intuitive but true.
Have you tried hard coding an IP address on the S2?
And by Hard coding, he means manually setting a Static IP address and now allowing the DHCP to provide you an IP address each time. Although the IP will most likely be the same while using DHCP, it has to request and authenticate each time. Setting a Static IP address eliminates the process of "Asking" for a IP address each time.
when the phone scans and finds the ssid, as part of that scan it checks if the router supports b/g/n then will try to connect at the highest speed. If the router isnt n compatible it wont even try.
I don't want to give the phone a static IP as I regularly visit three or four different wireless networks and they don't all use the same IP range.
I do know how DHCP works, this isn't a newbie question.
It seems definite now, watching the phone, that it tries to connect once (presumably on n), fails, then re-connects (quickly) on g.
Of course, I'll be changing the router eventually; I'm just interested in what's going on first
stuclark said:
I don't want to give the phone a static IP as I regularly visit three or four different wireless networks and they don't all use the same IP range.
I do know how DHCP works, this isn't a newbie question.
It seems definite now, watching the phone, that it tries to connect once (presumably on n), fails, then re-connects (quickly) on g.
Of course, I'll be changing the router eventually; I'm just interested in what's going on first
Click to expand...
Click to collapse
Understand about leaving it set for DHCP. Trying a fixed IP as a test may tell you if DHCP is part of the delay. If the b/g/n search is that slow it would be useful if it could be configured more precisely.
Have you tried it using another router using only g? If n is available it connects quickly? Seems like others would have mentioned this if it is something with the phone as g-only networks are still common.
I too am interested in disabling 802.11n. wpa_supplicant keeps hanging on some wifi networks and I suspect it may be because of n.

Incompatible with Asus N66U Router

I am not able to connect my Transformer Prime with my new Asus N66U router. I tried all channels and security settings and it only connected when to the router with open system setting. I am able to connect it to my old Netgear WDR3700 in good speed without any problems. Does anyone run into similar situation?
I have the rt-n66u router as well and never had a problem. Are you sure you are using the right encryption settings, Do other devices connect, have you updated the router's firmware? There was a new update just today.
http://support.asus.com/download.as...T-N66U (VER.B1)&os=&hashedid=PZkFHlMrGWzVROxT
have you ensured your router has the latest firmware?
I have the N56u model and no issues.
Yes, I have the latest firmware. My Galaxy Nexus connects just fine. The Transformers Prime actually see the router with strong signal. It just refuses to connect to it. BTW I set the router using WPA-PSK.
Is your prime running the latest update? Or, have you tried DD-WRT?
I have the latest firmware in both devices. However, my Prime is the first batch and may suffers from wifi issues. I may have to try Tomato or Dd-wrt firmware.
Sent from my Galaxy Nexus using Tapatalk 2
Some routers let you disable the broadcasting of the network name (SSID). Computers/network cards that conform correctly with the 802.11 specification will refuse to connect. Have you checked the settings for both 2.4 and 5GHz? - of course the router should not allow disabling of the SSID!
odd. Try wiping the data. Small pin hole in back of router. Reset it. Then 192.168.1.1. go in there and reenter your SSID etc on wireless.
For ****s and giggles. Pump up your 80mw Tx power of wireless to around 160mw. I been running 160mw tx power for awhile and have not and any problems. This baby can go all the way up to 500mw. Of course that is U.S. FCC range limit. With 500mw you can see your wireless from few blocks away.
If your prime is connecting to your other wireless router. Then has to do with some setting in on the RTN66U. Hopefully the wipe will clear any setting in the firmware.
Forgot to mention. Your prime will only connect to the 2.4ghz. It won't connect to the 5ghz wireless.
Did that already. My Transformer does see the 2.4 Ghz SSID with very strong signal. It just keeps reconnecting and fails to connect again eventually. My Galaxy Nexus can connect in a very good speed. Change back to my old Netgear WDR3700 and my transformer connects to it right away. It seems to me that the problem is the security encryption as connection is established right away in open system. However, it just refuse to connect on whatever setting I tried.
ariesting said:
Did that already. My Transformer does see the 2.4 Ghz SSID with very strong signal. It just keeps reconnecting and fails to connect again eventually. My Galaxy Nexus can connect in a very good speed. Change back to my old Netgear WDR3700 and my transformer connects to it right away. It seems to me that the problem is the security encryption as connection is established right away in open system. However, it just refuse to connect on whatever setting I tried.
Click to expand...
Click to collapse
What are the WiFi standards on the Router set to?
Sometimes when a router is set to b/g/n (all combined) it can lead to issues.
I generally keep mine at b/g (no n) on the 2.4 Mhz band, since my n devices run on my router's 5 Ghz band anyway. Try that out.
I tried "auto", "legacy" and "n only" with or without "b and g protection" but still could not connect to the router in any combinations. Will like to know the feedback from anyone who put Tomato on N66U.
If you have kept the same SSID as your old router did you delete the old network settings for that SSID in your TP? Also try a new SSID on the router.
If the router supports WiFi Multimedia (WMM) try disabling it and re-enable it after a connection has been made.
I presume you would know if you had enabled an allowed devices table -MAC addresses. The only other thing I can think of is the size of the "hello I'm here" beacon that the router transmits is too long for the TP and I think that would only be an issue with a very long SSID
Yes, I do keep the old SSID. However, I did forget the network and reconnect to it again in Transformer. My SSID is less than 10 characters. It seems to me that the Transformer is not able to get an IP nor pass the authentication stage.
ariesting said:
Did that already. My Transformer does see the 2.4 Ghz SSID with very strong signal. It just keeps reconnecting and fails to connect again eventually. My Galaxy Nexus can connect in a very good speed. Change back to my old Netgear WDR3700 and my transformer connects to it right away. It seems to me that the problem is the security encryption as connection is established right away in open system. However, it just refuse to connect on whatever setting I tried.
Click to expand...
Click to collapse
Well. Go under advanced settings and then Wireless.
Wireless -General tab.
Frequency click (2.4ghz).
Your SSID (name).
Hide SSID = (No)
Wireless Mode put in (N Only).
Control Channel (1).
Channel Bandwidth (20mhz).
Authentication Method (WPA2-Personal).
WPA Encryption (AES).
Enter your WPA Pre-Shared Key (password for SSID).
Network Key Rotation Interval to (0).
Wireless -Professional Tab
Frequency (2.4ghz)
Enable Radio (yes)
Date to Enable Radio (Check all days)
Set AP Isolatd (No)
Multicast Rate (Disable)
RTS (2347)
DTIM (3)
Beacon (100)
Enable TX burst (Enable)
Enable Wireless Multi (Disable)
Enable WMM (Enable)
Tx Power adjustment (80)
Try those settings. See what happens.
Will try it as soon as I get back home. Thanks.
I am finally able to get my Transformer connecting to my RT-N66U router by changing the SSID to a new one. The speed and range are not better to my old Netgear WDR3700 though. Thanks for all the help anyway.
ariesting said:
I am finally able to get my Transformer connecting to my RT-N66U router by changing the SSID to a new one. The speed and range are not better to my old Netgear WDR3700 though. Thanks for all the help anyway.
Click to expand...
Click to collapse
Good to hear!
I've had the occasional connectivity problem with mine, on certain routers I can get connection but no online connectivity.
some routers use a nonstandard DHCP range (i think it may the ones that utilise 192.168.1.x) anyway, if you encounter this it's simple to correct once you know you simply define a manual ip on the prime for that connection and voila! :>
ariesting said:
I am finally able to get my Transformer connecting to my RT-N66U router by changing the SSID to a new one. The speed and range are not better to my old Netgear WDR3700 though. Thanks for all the help anyway.
Click to expand...
Click to collapse
Cool. Glad you got it working.
Well you can always try and pump your TX power adjustment from the default 80 to 160 or more. I was able to increase my range. I think the max is like 500mw the chip is rated at. However, I havent tried that high. I don't want to burn out my chip. Plus heat increases dramatically at those higher mw's. You would have to toss a little laptop cooler underneath it. (run via the routers usb port there).
My connection problem happens again. Just in case someone has similar issue, I solve the problem by exchanging a new one from store.
ariesting said:
I am not able to connect my Transformer Prime with my new Asus N66U router. I tried all channels and security settings and it only connected when to the router with open system setting. I am able to connect it to my old Netgear WDR3700 in good speed without any problems. Does anyone run into similar situation?
Click to expand...
Click to collapse
I have the n66u too and have no issues.

Wi-Fi connectivity issues, Resetting mobile internet

I'm having trouble with keeping my Redmi Note 2 connected to home Wi-Fi. In the Wi-Fi menu, it often shows "Authentication problem". I am not experiencing this issue with any other Wi-Fi connection. Also, I have double checked to make sure the password is correct, and it definitely is not a password problem as it sometimes works.
I've even tried changing the password of my router, as well as the SSID (router wireless network name) to something else, thinking that it may have been a factor. Both methods did not help.
In addition to this, I am getting very poor reception at home for my data connection speeds. I don't think this is an issue with the phone though, as an iPhone 6S at home also has poor reception. However, I'm trying to figure out how to reset the network settings and I can't find it anywhere in the menus..
Would appreciate any assistance! Thanks.
More info.
What rom?
Which router, running which band?
Are you using n speeds, dual channels, single channel, wpa, wpa2 etc.
First thing I would try is set the router to G only (WPA_PSK). If that doesn't work, change the channel. Asus routers (the cheaper ones - e.g. NM10) can go coo coo bananas and fail to authenticate random devices, while others work just fine.
Try upgrading to the latest stable global xiaomi.eu rom. Get it here. Also, read the instructions how to flash there.
CeBits said:
More info.
What rom?
Which router, running which band?
Are you using n speeds, dual channels, single channel, wpa, wpa2 etc.
First thing I would try is set the router to G only (WPA_PSK). If that doesn't work, change the channel. Asus routers (the cheaper ones - e.g. NM10) can go coo coo bananas and fail to authenticate random devices, while others work just fine.
Try upgrading to the latest stable global xiaomi.eu rom. Get it here. Also, read the instructions how to flash there.
Click to expand...
Click to collapse
Sorry. Using SMIUI 7 by sebsch1991 (according to Settings -> About, based on 5.11.5).
I haven't fixed the problem yet.. but I realise that the Wi-Fi issue seems to "reset" itself after I restart. So whenever I notice that the Wi-Fi is no longer connecting, I just restart my Redmi Note 2 and it is able to connect again. Seems to occur in 24-hr loops?
I am using a D-Link DIR-865L. I have two bands (2.4GHz and 5.0GHz). Using the highest level of security I think? In my router settings, it shows I am using WPA/WPA2 (auto mode so it adapts to the device I believe). 802.11 mode is mixed (n, g and b).
The network settings issue I haven't found a fixed for yet, but to be honest haven't looked very far.. and I think it may be a telco issue.
xdaillum said:
Sorry. Using SMIUI 7 by sebsch1991 (according to Settings -> About, based on 5.11.5).
I haven't fixed the problem yet.. but I realise that the Wi-Fi issue seems to "reset" itself after I restart. So whenever I notice that the Wi-Fi is no longer connecting, I just restart my Redmi Note 2 and it is able to connect again. Seems to occur in 24-hr loops?
I am using a D-Link DIR-865L. I have two bands (2.4GHz and 5.0GHz). Using the highest level of security I think? In my router settings, it shows I am using WPA/WPA2 (auto mode so it adapts to the device I believe). 802.11 mode is mixed (n, g and b).
The network settings issue I haven't found a fixed for yet, but to be honest haven't looked very far.. and I think it may be a telco issue.
Click to expand...
Click to collapse
When I first started trying out different ROMs, I found a few of them gave me WiFi issues with different networks. Some networks would behave normally, others wouldn't connect at all. I believe SMIUI was one of the ones that gave me trouble with at least one of the networks I use regularly, so I had to go with a different ROM.
I can't guarantee that you're having the same issue, but swapping ROMs is my best advice.

S9+ showing "connected to WLAN, no internet"

So, I got my S9+ (international version, DUOS, 256 GB) last week from the Samsung store. I am on stock ROM (and will stay as long as my warranty lasts or someone finds a way to root with Knox 0x0, which I am not expecting).
At home, I have a WLAN Mesh (AVM Fritz!Box 6590 Cable, 2x AVM Fritz! 1750E Repeater on a wired connection), everything working great with any device.
Except my S9+. It connects and everything is fine, at some point - especially when using it for e.g. streaming Netflix or so - it will stay connected to the WLAN but will say "no internet access". Switching WLAN on and off fixes the issue until it happens the next time (minutes to hours later). I have no special settings, no neighbouring networks which would interfere. I have 2,4 and 5 GHz active and automatic channel selection. All other devices in my home work with no problems. I have found similar issues froim users on other Samsung phones (S6/7/8 series (my former S5 on Resurrection Remix Oreo does not show t his behaviour)), but no answers that worked (like forget the network, reboot and reenter credentials).
Quite annoying, anyone knows a fix? Big THANKS in advance.
No one experiencing the same thing or havin any ideas?
I have had the same issue in the beginning with the phone. I have a router with a cisco switch connected to it. The standard router's wifi wasn't sufficient in coverage through my house. I got hold of a cisco AP and connected it to the switch and disabled the wifi on the router. That's when my issue started. Fiddled around trying various options, but the one that worked for me was to tell the phone to forget my network, restart the phone and then "setup" the wifi on the phone again(password for wifi needed to be entered as it sees the network as a new one) Haven't had the issue after that. I did notice at my office that even though the wifi conection is good, that if it goes below a certain percentage, the mobile data will kick in, although I have that option switched off. I also picked up that if your line connection's speed goes very low for whatever reason, the same problem appears again that the phone assumes there is no internet
Thanks, this is what I've read from other threads (with S7, S8), too. But this didn't work for me. My repeaters get ther signal through LAN cable and I have a fast connection, coverage all over my house and garden. I really do not have an idea on what to try...

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