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wifi sleep policy not work correctly?

My wifi seems to disconnect from my wifi when the screen turns off, despite me having changed my settings to never sleep. When I look at the wifi settings it says "Unsuccessful Connection". I didn't have this problem with my MT3G.
Anyone having similiar issues or a fix?

wifi Reconnection issues
I'm having the same problems with mine.
It initially connects to wifi fine but when the screen goes off it sometimes drops the connection and will not reconnect without a reboot.
I have tried setting it to keep the wifi when sleeping but it makes no difference.
I found a few similar reports elsewhere and followed most of the suggestions, like changing routers, changing wifi channels, setting an IP address instead of DHCP etc. Nothing seems to make any difference so far.

Mine never seems to reconnect after waking up, but I just go into the Wireless settings/Wifi settings window (where it lists all the Wifi networks in the area) and press on the network name and it brings up a dialog allowing me to connect again. I press the Connect button and it instantly reconnects. No reboot required...

Try increase your router's "Group Key Update Interval". I had the same problem with my D-Link DIR-655. I changed mine to 10 hours and it's working fine for me now.

i have the issus that my wifi is "connected" i mean i see the logo at the top bar but after a few minutes i don't get any update from the internet like gmail oder twitter when is wake up the device from sleep i get them back again
maybe it something with the Group Key Intervall but i can't switch it on my speedport w700v router

I just tried switching mine, highest it can go is 7200 seconds, so I bumped it to two hours instead of one. linksys
my wifi reconnects when I wake the screen almost 100% but it's not reliable.
I have to go to wifi list and reconnect. Sometimes I disable wifi and then re enable, conects no problem. Irritating

i heared that switching the encryption from wpa/wpa2 to only wpa2 will solve this issues, will try it when i am at home

...seems like almost everybody got this problem.

for example with my Hero i don't had this problems so it's something with the W-Lan card of the Nexus

Got this problem too but will try the suggested work arounds when I get home tonight

found out that my encryption is wpa2 not wpa/wpa2 ... damn so thats not the reason
and my router cant configure the group key intervall

I don't have this issue, running CM5.0.3.1, mine is set to Never Sleep and it does not. My connection does not time out either. I connect to two Trendnet TEW-637AP's at home, in mixed b/g/n mode with WPA2-PSK mode security.

Could it be, that this prob exists just for nonrooted phones?!

i've got mcr 1.6 which is rooted and don't work
i think it's a problem with the wifi card and the wifi router
rooting just means that you get read/write access to all folders
doesn't change anything on your wifi connection

qvert said:
i've got mcr 1.6 which is rooted and don't work
i think it's a problem with the wifi card and the wifi router
rooting just means that you get read/write access to all folders
doesn't change anything on your wifi connection
Click to expand...
Click to collapse
Not exactly, it means also modified system files, which could include those that interface with the wifi chip and those that control the sleep state of the device.
Also, Cyanogen (and most other custom roms now) are running on a different (newer) kernel.

yes i know
but mcr is although running on different kernel and it's not working there
i don't think its an issue bei the stock rom and mcr
maybe here is someone with CM where the wifi drops?
edit:
okay i tried it with the desire rom version from modaco, the same failures, maybe i try a CM built now, and see if it changes
Code:
[B]Rom [/B] [B]Router / Access Point[/B]
MCR 1.6 | Speedport w700v | not working
Desire MCR | Speedport w700v | not working
CM 5.0.3.1 | Speedport w700v | not working
i think this means it's not a rom issue, its something with the routers and access points in combination of the wifi card from the nexus

That´s strange..perhaps just accidentally, but: yesterday I installed "Task Manager" , which has an auto-kill function.....since then my Wifi reconnects perfectly

maybe because it automatically does anything inside of the 10 minutes which keeps the wifi active?
which one did you install?
there are a lot of them on the market
which developer?
edit:
ah i found a strange issue, today i was at the wifi of my girlfriend, she has the same router BUT i don't have the wifi problems there, with the same model of router thats very strange

i found another work around, i set my twitter client to 5 minutes update intervall, this means every 5 minutes is network traffic and the connection won't drop after my 10 minutes public key intervall change
don't know how much battery is used while setting from 10 to 5 minutes but i think it should be okay

Try a different WiFi channel
I've seen reports of WiFi connection problems being solved by changing channels on the AP. Channel 10 seems to be a consistently reliable choice.

[Q] Major wifi problem

I have a major problem with wifi on GingerDX & stock kernel, it drops the connection everytime it is idle, and it many times doesn't come back by itself or the statusbar shows it is connected, but there is no connection, and in these cases i have to switch it off and on. There is no encryption on the router. I set the wifi sleep policy to never. This doesn't happen on stock ROM. Any solution to this?

Lajbymester said:
I have a major problem with wifi on GingerDX & stock kernel, it drops the connection everytime it is idle, and it many times doesn't come back by itself or the statusbar shows it is connected, but there is no connection, and in these cases i have to switch it off and on. There is no encryption on the router. I set the wifi sleep policy to never. This doesn't happen on stock ROM. Any solution to this?
Click to expand...
Click to collapse
Set the WiFi sleep policy to "Never" to avoid WiFi going "ZZzzzzzz" when the phone is idle (lockscreen kicks in)

I mentioned that i already did that.
And it does it too when it is awake... i already downloaded many apps to keep the wifi awake but no success.

In this case it would rather seem you have a compatibility problem between the ROM and your Access Point / Router.
Try switching channels or secure your network to rule out your problem comes from tons of strangers using your wifi.

I think i switched channels before, and no success. The router doesn't accept connections from unregistered devices so even without password, nobody can connect from outside.

Lajbymester said:
I think i switched channels before, and no success. The router doesn't accept connections from unregistered devices so even without password, nobody can connect from outside.
Click to expand...
Click to collapse
LOOOL ... MAC addresses are sniffed in a matter of split-seconds.
Anyway, since you are certain you already did everything in the book, and outside the book ... maybe try changing your WLAN cable past a new one.

There is no WLAN cable on the router, the antenna is connected directly to it. By the way 2 computers are connected through wifi and their connection is constant. But if it works on stock rom then there is something in the rom itself.

I suggest edit twilan.ini to make N standard work. This solved my wifi problems on SDE .
Search XDA for n standard on x8
Sent from my E15i using XDA

I'm gonna test it for some time, I will report back if it worked or not.

I have similar problem myself as well. I even upgrade it to latest rom and it still does that. I already set wifi sleep policy to NEVER yet the damn thing could randomly decide to cut off. As soon as I wake the phone up it will re-establish connection. Ever single time. Why does it not try to re-establish connection while the screen is off? The funny thing is that I have no idea when it drops connection. The logging has no time stamp that I could track down events.
I believe sincerely that there's still some bugs to be rid of

Try enabling N standard, since i enabled it the wifi stays connected, for now.

i had the same problem.. U just have to use nAa or Alfs for cm7 kernel and rom which works with these kernels and no problems anymore

[Q]Suddenly losing WIFI connection when phone is idle

Hello.
I am using my I9000 for a good while now and i am running cm11-20150901-SNAPSHOT-XNG3CAO3G0-galaxysmtd. Everything was running fine so far, but suddenly for some days now, the WIFI connection somehow gets lost when it's idle.
When this happens (and i don't know on what timeframe it does) and i activate the phone (pressing the home button) the WIFI symbol is either shown and then disappears or is already gone - but then after some seconds comes back and WIFI is on again.
Yes, i do have the setting for standby WIFI on always, so this should not happen.
Does anyone have an idea what could be the problem here?
Also i do have a fritz.box 7390 which supports a 5GHZ network - does the I9000 support a 5GHZ wifi? Maybe it's the router that's causing the issue an switching to the 5GHZ might fix it - but so far i could not see the network when it's on 5GHZ.. So i guess it's not supported but thought i might ask anyways...
Thanks!

WiFi randomly disconnecting on .575

Hello,
I recently flashed .575 on my Z3C, now WiFi connection is unstable, disconnects after a while. The consequence is that updates do not work correctly, file transfers through WiFi are often interrupted. Did any one notice the same behavior? Any fixes (tried different AP and to reflash the FW)...
Thx

Problem persists in 23.5.A.1.291

Similar issue here

I also have problems with the latest 23.5.A.1.291 firmware. There are two problems in fact, sometimes it disconnects and can't reconnect anymore without rebooting and the other is that, while it still seems connected to wifi, it's effectively offline as internet doesn't work anymore, after a while it starts working again.
It's a pity because the Z3C was the device with the best wifi and coverage that I've ever tried with the previous Lollipop. I partially resolved the problem, meaning that it happens less, changing a few parameters into the router, disabling every possible feature, still isn't completely resolved...

difto said:
Hello,
I recently flashed .575 on my Z3C, now WiFi connection is unstable, disconnects after a while. The consequence is that updates do not work correctly, file transfers through WiFi are often interrupted. Did any one notice the same behavior? Any fixes (tried different AP and to reflash the FW)...
Thx
Click to expand...
Click to collapse
settings/developer options/use legacy DHCP client - enable

Didgesteve said:
settings/developer options/use legacy DHCP client - enable
Click to expand...
Click to collapse
I'm not OP, however I tried that setting but it didn't improve much. After all, DHCP is a protocol which should be used only at connection startup theoretically

I also have the same issue, however installing Auto Wifi Manager seems to have helped -
https://play.google.com/store/apps/details?id=auto.wifi.toggle.manager

Didgesteve said:
settings/developer options/use legacy DHCP client - enable
Click to expand...
Click to collapse
Already tried but it didn't helped. As for the issue, for me it disconnects and reconnects instantly even with full signal every 5-10 min. So it does not eat my mobile data however every lengthy file transfert by wifi might be interrupted.
Tried different channels, 2.4ghz, 5 GHz on two different routers at home, on several public Wi-Fi AP, behavior is still the same.
If screen is on the connection stays but is sometimes interrupted and reconnects directly. If screen is off Wi-Fi gets cut for 2-5 min then reconnects (according to logcat, might be Doze? Wi-Fi is set to be always on). Tried also a full reset of radio settings.

Solution
Does not work unfortunately.
I might have a good news for you guys. I think I finally managed to solve the issue:
1) Download a Lollipop FTF
2) Open flashtool in Flashmode for this FTF and exclude everything except packages beginning with AMSS* (it will not alter any data on the phone and it's very quick, also does not need to regenerate the dalvik cache)
3) Flash
-> You just replaced the baseband / modem with the Lollipop one. Tested briefly on mine and so far no disconnections

Same problem here, after update to .575, and .291 didn't help.
Sometimes when I open WiFi networks phone doesn't find any network at all. Also bluetooh is acting weird sometimes (disconnects, can't turn on).
Tried with DHCP and clearing radio settings, and even downgrading to 23.4.A.1.264 and 23.1.A.1.28, didn't helped.

May be it is hardware related... I am on 4.4.4 and have same issues. On some routers better, on some worse. Also sometimes works ok for long time, next day same place disconnecting...

In my case, everything was OK until upgrade to MM

pawlak2 said:
Same problem here, after update to .575, and .291 didn't help.
Sometimes when I open WiFi networks phone doesn't find any network at all. Also bluetooh is acting weird sometimes (disconnects, can't turn on).
Tried with DHCP and clearing radio settings, and even downgrading to 23.4.A.1.264 and 23.1.A.1.28, didn't helped.
Click to expand...
Click to collapse
For me downgrading to Lollipop 23.4.A.1.264 solved the issue but as soon as I install Marshmallow, even a clean install by PC Companion the problem reappears. So I will stay on Lollipop for now, it also has Stanima
I think something is wrong with the way Marshmallow manages the WiFi connection

difto said:
For me downgrading to Lollipop 23.4.A.1.264 solved the issue but as soon as I install Marshmallow, even a clean install by PC Companion the problem reappears. So I will stay on Lollipop for now, it also has Stanima
I think something is wrong with the way Marshmallow manages the WiFi connection
Click to expand...
Click to collapse
you're right. but luckily this problem can be solved! go to Developer options in Settings and check "Use legacy DHCP client". then reboot your device - problem solved!

toxic-hero said:
you're right. but luckily this problem can be solved! go to Developer options in Settings and check "Use legacy DHCP client". then reboot your device - problem solved!
Click to expand...
Click to collapse
This trick seems to solve another problem, for me it did not change anything in the issue

thanks

Question S21 Ultra Exynos wifi problems

When connected to wifi from time to time the connection stays but the speed drops to virtually zero. Toggle wifi off/on solves the issue for the moment.
I have experienced this on many differens locations, so likely not router dependant.
Any hints? Thanks!
FW is always the latest from samsung and I have not seen any dirrerences after updating. This have been going for long.

henke2 said:
When connected to wifi from time to time the connection stays but the speed drops to virtually zero. Toggle wifi off/on solves the issue for the moment.
I have experienced this on many differens locations, so likely not router dependant.
Any hints? Thanks!
FW is always the latest from samsung and I have not seen any dirrerences after updating. This have been going for long.
Click to expand...
Click to collapse
In the advanced wifi settings turn off:
switching to cellular data
wi-fi power saving mode
(or something similar, I use a different model).