Problems connecting to some wifi networks (GT-i9100M) - Galaxy S II Q&A, Help & Troubleshooting

Hey all,
I've had my Galaxy S II GT-i9100M for a bit more than two months now. It's been on ICS 4.0.3 since the first day I got it, and is unrooted.
Wifi was working fine the first month or so that I've had it. However, in the last month, while trying to connect to my university's networks from the wifi settings screen, it will display "connecting" for a long time, then change to "saved", without successfully connecting to the network. Odd thing is, if I turn the wifi on and off repeatedly, it may connect eventually, with around a 5-15% success rate each try. However, there's also a relatively high chance it will automatically disconnect itself within a few minutes.
The school has three main wifi networks: one is unsecured, while two are secured with exactly the same authentication methods (PEAP + MSCHAPv2) and takes the same login credentials. All three have the same problem when I try connecting. It's not a problem with signal strength, either, since my friends nearby can connect using their phone or laptop without any problems.
Here's what I've already tried to do to fix this:
Asked the school's IT helpdesk
Forget both secured networks so the phone can autoconnect to the unsecured one
Tried wifi diagnostic tools, such as Wifi Analyzer and Wifi Fixer, and tried changing to a better channel
Deselected "back up my data" in the Back Up and Reset settings screen, deleting existing wifi settings from Google's servers
Connect using a static IP address rather than DHCP. Either it has the same Connecting->Saved issue, or says something about "avoided a poor connection"
Did a factory reset, including wiping all user data
The wifi has no problems connecting to my home wireless network, and to most, though not all, other public networks I've tried (same problem as above if it doesn't work).
On a somewhat different note: there are two networks (each of which I've only connected to once at most) that are permanently saved on the list of access points; there's actually no way to forget/delete the network. They even survived the hard resets, and are listed before I link the phone to my Google account. Could this be related to the main issue above?
Is there a fix for this issue? Thanks in advance for any suggestions!

Related

[Q] Home wifi suddenly not working right with archos 70

I have recently returned to my apartment with my brand new archos 70. I use WPA2-PSK encryption for my wifi network. at first everything was golden, I could browse the web and whatnot just fine. as of a few days ago, wifi has not been working correctly. my device connects to the network (pulls an ip address from the router) but when I try to browse web pages or open web based apps they hang up and act as if I have no connection. it works fine on other networks (to limit the problem to my network) I have tried doing a factory reset of the device, tried power cycling my router and modem with no luck. I have also changed encryption types to no avail. i have the latest firmware for the gen 8 series. also from time to time during this session of events, sometimes it will connect to the router, then disconnect and reconnect. I have no clue whats going on because I havent changed any router settings since I got back. the only other devices on my wifi network are two laptops. any help would be appreciated.
you mean you restored to the factory settings ran through the start up all over again and it still won't connect to your router? have you tried any other types of connections or routers?
I had this problem just the other night was this close to reformatting the whole thing. but I solve the problem by turning the device off, then holding the reset button while it rebooted to turn it off again, an reinitializing the drivers.
how do you reinitialize the drivers? I did a factory wipe. and it connects, it shows as having network connectivity (even my router lists it as a dhcp client and currently making use of the access point) but no internet functions work. ive connected to other networks fine.
This happened to me when I first got my A70. What I had to do to fix it (after getting incredibly pissed, reformatting twice, and almost returning the thing) was to set it up to use a static IP address on my home wifi network. Don't know if it'll solve your problem, but it works beautifully for me and I'm able to enjoy the device now.
Just remember to uncheck "use static IP address" when you get on other wifi networks.
well, I set up static addressing, gave it a private ip, set up the gateway and dns, and it still wont connect to anything.
If set as wireless N, set as N+G or G only, latest firmware may have trouble connecting to wireless N networks.
na, I dont have it set to n, I have it set to auto which I believe puts it to g with my archos. thing is, it used to work. now it suddenly has problems.
Im beginning to wonder if the archos tablets are just picky about wireless routers. I wouldnt think so...
Upgrade the firmware
Archos published a firmware upgrade to solve this problem (December 2010). The related bug in the release notes is...
Wi-Fi: fix Wi-Fi stuck after a while when using WPA2/AES encryption mode
The new firmware download link is in the Archos website.
you can download the firmware to your computer, copy it to the root directory of the tablet using the USB cable, and run the upgrade process in the tablet.
... or you can use another WiFi network (without WPA2/AES) and download the update in the same tablet
Note: I cannot send the links, however you can use the information to search the links in the internet.

[Q] No Wifi after Wifi Analyzer...

Hey guys,
I have a problem with my wifi...
Here is the before: Wifi works about 70% of the time, occasionally the connection would be dropped (as in "no network access", it still said it was connected).
Here is what then happened (in that order): Wanted to find a less crowded channel and installed Wifi Analyzer. Quickly decided that Channel 1 would be cool, browsed to the router configuration on the Desktop machine (LAN connection), changed the channel. Back to home on Android (don't remember whether via the home or back button). Into settings to see whether I would have to rescan or whether it would pick up the change of channel itself. It couldn't connect... It scans and attempts to connect, but doesn't
What I tried:
I restarted the Galaxy. Still couldn't connect.
Deleted the connection and re-entered the passphrase. Still couldn't connect.
Uninstalled Wifi Analyzer. Still couldn't connect.
Restarted device again. Still couldn't connect.
(At some point during all this, probably quite early, the Wifi symbol also stopped showing up in the status bar. Doesn't appear no matter whether Wifi is on or off)
Switched back to the channel I came from. To no avail
Switched of encryption on the Wifi. Still to no avail
Any ideas as to what might have happened and, more importantly, how to fix it? As I said the connection itself has never been the most reliable, but this is a different league
Thank you everyone!
Sandro
If you haven't tried it yet, reset your router. That fixes the majority of Wi-Fi issues out there. If that doesn't work, it may be your router itself. Certain routers have more issues with mobile phones than others.
You may want to go to a friends house and try connecting to his router and see if you can troubleshoot and isolate the issue. Either way, best of luck...
Sent from my GT-I9000 using xda premium
Damn you sitecom router!!!
Alright, one thing I hadn't tried until now was to restart the router. That fixed everything including (for whatever reason) the lack of the Wifi symbol!!
So if that is possible feel free to delete this thread! I didn't find the option anywhere...
Sorry for the unjustified disturbance
Sandro

Obtaining IP address..WIFI NOT WORKING!

So, there's been quite a few threads on several different forums regarding the "Obtaining IP address.." issue. I have followed every single solution by doing the following:
1. Access AllShare and connect to WiFi using AllShare
2. Access Kies and connect to WiFi using Kies
3. Factory Reset (Hard Reset by pressing Volume Keys and Home)
4. Soft Reset (Via Settings, wipe Data)
5. Static IP option
6. Added Note's MAC address to my router
7. Rebooted router
Nothing works! I also tried to connect to another private network without a Key and a public open network, both of them didn't work.
What to do? My brother bought the phone for me from Rogers and I'm still within the 15 days but I've used over 30 minutes of airtime. Also, I don't have the papers, I'll have to ask my brother but I don't live with him anymore..so I'm kinda stuck.
Does anyone else have any solutions? I called Samsung and they said I have to send it for repair =/
Noone?
I usually just toggle wifi on/off if it gets stuck on obtaining IP address.
Sent from my SAMSUNG-SGH-I727 using xda premium
I wish it was that easy..I tried that a couple of times and it's still not working.
chichi8 said:
I wish it was that easy..I tried that a couple of times and it's still not working.
Click to expand...
Click to collapse
At my home network. I have a wifi Extender. connecting to a wireless router. Working fine. I also have another wireless router acts a bridge mode to have a different SSID, i never be able to connect to this bridge connect. it hang it "Obtaining IP...." all the time nomatter how i try on and off
Doesn't do anything to my Note. Sigh.
Thing is, I can't always adjust my home router but what about other networks? When I go to STarbucks, Mcdonalds, Airports, Hotels, I can't ask them to reboot and all that stuff. I have to exchange this phone!

Can't get online via DD-WRT router?

Hey folks,
Not quite sure where to begin with this one, so I figure I'll just explain what I've done so far and see if any of you have any ideas.
First off, I tinkered with the settings of two DD-WRT hotspots (both 2.4ghz and 5ghz respectively,) but various alterations made no difference, so I restored them to how they were before.
I then set up a wifi hotspot on a spare Note 3 that I have lying around, both in 2.4 and 5, and 5 wouldn't work altogether (giving me a generic error message when trying to initialise the hotspot) while 2.4 worked but just wouldn't connect at all to my A10.
For the record, I am able to *connect* to the router, my A10 is just the only device in the household for which the router doesn't then open up to the greater internet.
I have set up a DHCP entry for the phone, both using its randomly generated local IP address and swapping the name and MAC with a previously established entry that I know works, and I have uaed both auto and manual settings on the device (I use 1.1.1.1 and 1.0.0.1 DNS servers so I figured I'd manually input them too).
Either way, the A10 doesn't connect to the internet via wifi, just network data, while all my other devices are fine.
Does anybody have an idea how I can resolve this issue short of sending the device back altogether, or at least for a hardware check/repair?
Thanks for your consideration,
Kaolin
Just grabbed some screenshots of my settings, can get more if these aren't enough. How do I attach them?
update:
I contacted my network provider and they had me reset my overall settings and rebooted, and then after that didn't work, I reset the network settings specifically. Still no change.
I'm concerned that it's a Modem firmware issue, which would suck, because the A10 custom ROM scene is tiny.

2 android phones wont connect to wifi with new ISP, worked fine with old ISP

Hi,
Both myself and my wife's phones worked fine with our previous ISP. We have moved to a place that our old ISP does not provide service to, so had to go with another ISP. All of our devices work fine when connected to WIFI except my wife's android phone (Sony Xperia X Compact, latest stock rom) and my old Android phone (Moto G 4G running Lineage OS 14.1).
When either of us try to connect either of these 2 devices to our WIFI, they connect for a couple of seconds, then disconnect. They go through the following steps and then constantly loop
obtaining IP address
connected no internet
connected
saved
disconnecting
Rinse, lather, repeat, they both keep doing this constantly. Both these devices work fine on other networks and worked with my old ISP, so the devices themselves are physically fine, and all the other devices in my home connect to the new ISP's router fine as well.
Ive done the following to try to resolve the issue
Forget network and join again
Renamed device names
Temporarily disabled wireless encryption on router
Made sure Mac filter on router is off
Assigned static IP address to both devices
Cleared cache on google play services
Connected a 2nd router to main router as an access point using a different SSID
Used WIFI analyzer to see what WIFI channel was being used the least in my neighborhood and changed the channel on the router accordingly
Turned airplane mode on and off
Turned device off for 30 seconds then back on
Reset network settings
None of these steps have worked, the only thing I haven't done is factory reset both devices which my wife isn't prepared to do with her device but I might do with mine. Are there any other steps that might resolve this before I pull my hair out ?.
Thanks in advance.
@J0hnick
1. A Factory Reset doesn't take effects on Android's system settings
2. Android by default always tries to connect to near-by Wi-Fi networks you've connected before. Hence you've to remove saved networks ( i.e. Forget network ), then add new new network ( i.e. Add network & Save)
Have you tried restarting the router?

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