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Home WiFi connection problems

Hey world,
I'm having trouble with my Roger's branded Samsung Captivate SGH i-896's wifi. The phone is completely stock. When I connect to my wireless AP at home it doesn't seem to always work on the captivate... I had a htc magic before running all sorts of different roms and never had a problem like this before.
What happens is that I would connect to wifi at home and it would work, but if I leave wifi on the phone for an extended period of time and go back to the phone, wifi stops working.
It would show that i've successfully connected to my AP but no data would pass through my phone.
Disconnecting and reconnecting to the AP doesn't seem to work, the only way to fix it is to restart the phone. I'm not experiencing this problem with any of my laptops, netbooks or cellphones at home.
Security type is WPA2.
Is anyone else experiencing this problem? Anyone have an idea what could be causing this problem?

I have had this problem intermittently, So has my wife on her Captivate. No idea what causes it though. It's a pain because if WiFi is on, but not working, 3G doesn't kick in so apps just don't work.

my wife's captivate has this issue as well (but I don't on my captivate). It will work for a short period and then stop. We have a fios wifi router, not sure if that matters at all.
restarting the router and/or phone usually fixes the problem

mine is a linksys... hrnnn

I'm having the same problem on my new Captivate. Tried it on several different networks with the same results (shows connected but no data will transmit) before I took it back to ATT. They scratched their collective heads and rebooted (powered down and removed battery), which is a temporary fix, but its been working for two days now and I turn off WiFi unless I know I'm in range of a working hot spot.

I was having this same problem until I set my wifi policy to never sleep, dont know if it is a fix for everyone but it definitely fixed my problem.
Sent from my SAMSUNG-SGH-I897 using XDA App

Glad to hear I'm not alone!
I've been fighting with this issue for over a week now, it suddenly started occurring. I wonder if it was an app we all loaded that suddenly made this condition occur? If you look the phone is requesting an IP and if the IP given back by the router is the same one it already has the phone doesn't acknowledge that command. If the router is rebooted then a new IP is given, or what is considers new. This is a HUGE problem and I've put in some time looking at it, but one of the problems is that is comes and goes. What your router log and you'll the phone request an IP over and over again, all the while the router saying "here, take the same one you already have back".
If you use the app "Network Info II" you'll see the problem when it displays a "Device IP" at the top of 192.168.1.254 and WiFi IP address will be the correct one, in my case 192.168.1.108. When we have these two IP numbers showing differently the device is hosed. Rebooting will put them back in sync, but that is not the proper solution, we need to get to the bottom of this! I understand the WiFi IP address showing at the bottom but the "Device IP" I do not, why the difference? How can we affect the "Device IP", where does the device get that IP address?

Try the app called WiFi Fixer. That did the trick for me. There seems to be a bug of some sort that causes the phone to not release the IP address. Or you could use static IP but that worked only for a while.
Cheers.
Sent from my SAMSUNG-SGH-I897 using XDA App

the app doesn't seem to work for me.... =(

DKirk said:
How can we affect the "Device IP", where does the device get that IP address?
Click to expand...
Click to collapse
The phone gets the device IP from either the service provider (when using edge/3g), or from the router (when using wifi). If an IP address is not provided, it uses a default IP address, which is always outside of the standard private IP block.
There are two ways to assign an IP address: dynamically and via static IP address. Dynamic = assigned by the router, static = pre-programmed by you. I don't know if you can set a static IP address on a phone, as I've never tried it.

I had a zyxel wireless n router in my house and could never get the wifi to work on my captivate. If it did work it lasted 5 seconds... I was really pissed.
I was thrilled to see that buffalo is now back in the market and with dd-wrt firmwares... So I picked up the most expensive one they had for $89.99.
it has a dlna client built in as well as bit torrent, also lets you use a spare usb hard drive as a nas... things i don't know....
However loaded up the wireless settings in 2 minutes and voila... perfectly working on my captivate... I have also found that this router works flawlessly with G+N devices and it is gigabit. I was able to stream 1080p video from my synology 411+ to my ps3, download on the captivate and be on two other laptops at the same time without any issues... I am very very impressed with the buffalo.
Here is the product info.
buffalo nfiniti wireless n high power router and access point. WZR-HP-G300NH
ohh and my laptops are connected fully at 300 mbps with this router wirelessly...
very very happy with it.... Oh and forgot to mention... once this started working with the buffalo i noticed my batter was much better running on wifi all the time. Also wifi file explorer pro works flawlessly.. I was able to upload a 700 meg movie to my captivate wirelessly in about 2 minutes.

WiFi fixer did not fix my problem as well. After turning WiFi on the device IP remains 192.168.1.254 while the WiFi IP is correctly set at 192.168.1.108. When these two IPs are different WiFi does not work and WiFi Fixer doesn't appear to see any problems here.
The router here is an Asus RT-N16 running Tomato and I'm fairly confident that isn't the problem. This is more like an internal routing issue inside the phone.

I don't think it's brand of router that matters... maybe a setting on our routers can fix this...?

I've searched the internet to find a sol'n but it looks like this wifi problem is a widespread problem for almost all galaxy S devices... ppl have made temporary workarounds (ie. setting a static ip) but ultimately, there is no fix for this problem.... gg...

bigbrotherbear said:
I've searched the internet to find a sol'n but it looks like this wifi problem is a widespread problem for almost all galaxy S devices
Click to expand...
Click to collapse
It appears to go beyond Samsung Galaxy, I've seen the same issue with Nexus and Motorola Droids. VERY frustrating!

tylerdurdin said:
I was having this same problem until I set my wifi policy to never sleep, dont know if it is a fix for everyone but it definitely fixed my problem.
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
I dont know why nobody even notice that answer !!!!
had same problem on my milestone .. it is not a bug , wifi goes to sleep , its the way your phone is set up ... as its quoted here set it to never sleep and make sure your not using soem kind of app that will overwrite that setting ( like battery manager that for example could turn off wifi to save battery)
very easy to double check once your wifi is not working , go in wifi settings scan and check the wifi access points you normally use you ll see its set to disabled ..
the bug is it doesnt resume like it should. or gets re-enabled however you wanna call it . just re-enable it voila ! no reboot needed .

I got it working!!
This may be my first post here, so be kind...
Running Cognition v2.3b3 and Linksys WRT54G router. WIFI was working fine until I flashed to Cog 2.2 Then I could only use WIFI tethering, no other WIFI connection would work.
I tried setting up static IP and setting sleep to never. Didn't work. Changed router security from WEP to WPA Personal and got it working.
Phone settings: Go to Wi-Fi Settings, click menu, and goto advanced. I don't know if all the settings here are necessary, but I'll post what I have.
Port = 80
Use statis IP = checked
IP address = 192.168.1.103 (check your router assignments for an open address)
Gateway = 192.168.1.1
Netmask = 255.255.255.0
DNS 1 = (check your router config. For my router it's located under the Status, then router tabs.)
Router settings: (Under the Wireless, Wireless Security tab)
Security Mode = WPA Personal
WPA Algorithms = TKIP
WPA Shared Key = (your access key used when you attempt to athenticate from your phone)
Group Key Renewal = 3600 seconds
Write the access key down so you can use it to reconfigure the other wireless devices on your home network.
Good luck,
Glen

changing my router fixed the issue.
I have wifi running on my captivate for 8 hours at a time at work now and at home. Not one hiccup or disconnect, works 100%.
99% of wireless routers are crap. I work in IT and have dealt with most major brands and had been running linksys wireless routers with dd-wrt on them...
if you got a spare 90 bucks.. go to your microcenter or place where they sell buffalo routers and pick one up. If it doesn't work.. you can return it.

This worked for me

Going to a static IP worked for a few hours and then it stopped working as before. WiFi is set to not sleep.
When I ran the router without security I did not have this problem and since adding WPA2 w/AES+TKIP the problem has developed. The iPod Touch doesn't have a problem with it, nor my laptop or wireless ipTV set-top box, only the Android. I'm leaning towards setting up another router without security, on a different channel, and see if the problem disappears again. Here in 2010 we shouldn't be having this issue, but look on other forums and you'll find similar complaints with other brands of Android phones, it's not a Samsung thing.

[Q] Wifi Problems

Hey guys/gals, I have a problem with setting up the wifi on the tab 7.0 plus.
It sees my SSID - I enter in the password, it says obtaining IP - but is stays there never actually giving me an IP from my router. I get signal strength, etc. but I cant access the net.
So i decided to try to set a static IP, but that did not work either (but not sure I did this entirely correctly, so ...)
Any solutions? Whats the problem? it can be that hard....

Shftup said:
Hey guys/gals, I have a problem with setting up the wifi on the tab 7.0 plus.
It sees my SSID - I enter in the password, it says obtaining IP - but is stays there never actually giving me an IP from my router.
Any solutions? Whats the problem? it can be that hard....
Click to expand...
Click to collapse
The likely problem is that DHCP isn't running on your network (or isn't working.) DHCP is something that usually will run on your router and assigns IP numbers to devices that connect to it. It's also possible that DHCP is working fine, but you have MAC Address filtering enabled on your router (which basically limits which devices can attach to your network.)
Finally, it might simply be a router incompatibility (though I haven't seen that very often.)
As to how to resolve those things... I can't answer that... I don't have the same router you do (unless you just so happen to have a linksys E4200), so can't walk you through reconfiguring it.
Good luck
Gary

Had the same problem at the beginning when I unboxed my Tab for several times. After few resettings my router an Tab it finally started to work and since that moment couple of days without any issue. So don't know where was the problem..:-(

I also had DHCP issues upon unboxing the tablet. When it first powered up and tried to connect to my D-Link router, my Wi-Fi would go offline. All of my other connected devices would also go offline. After pondering this bizarre behavior for a few moments I decided to turn off the tablets wifi. The router and other devices magically came back online and connected.
After repeating this several times just to make sure I wasn't seeing things I assigned a static IP to the tablet. Everything worked fine after that.
What I think was happening there was that the tablet was trying to grab the router's IP address and that was knocking everything offline. This is just a guess though. Maybe someone with more network saavy than me has some thoughts?

thanks i will try these tonite and reply back.
My Tab is rooted, but I dont believe that matters, correct?

Yes it shouldn't matters...

So i played around, couldnt get DCHP to work for an IP. So i went back to creating a static IP - i missed 1 digit on DNS1 the first time which is why it didnt work last night. Once the static ip was up - boom.....magic. I called samsung support, they indicated that this is a know issue with some home routers (mine is a 2wire) and that a static IP is the solution.
thanks for all the tips above, much appreciated.

[Completed] Networking issue in android 4.2.1 Galaxy Nexus

Hello,
I have a galaxy nexus running stock android 4.2.1 with a very peculiar problem. From time to time i have trouble accessing a certain website if i try from wifi or from mobile connection it doesn't matter. If i restart the device the website works without a problem. It was a very odd problem and kept bugging me so i tried to focus on finding the real cause. After a lot of try and error i managed to arrive at this situation:
I have at my disposal 3 different wifi networks (lets call the wifi-1,wifi-2,wifi-3) and mobile broadband connections.
after a reboot of the phone (just to have a clear state) if i connect to wifi-1,2 or mobile conn the website works OK. if i connecto to wifi-3 the site also works OK but then after i disconnect from wifi-3 and connect to any of the other wifi-1,wifi-2 or mobile conn it doesn't work anymore. If i connect to wifi-3 again it works fine on that network.
I've connected to the phone using connectbot and checked the ip address and different params. and i simply can't get a ping to that website. a similar website located in the same subnet but on a different IP still works.
So what could happen on the network layer on the phone to stop working the connection to a certain IP?
Where could i find some info about how to debug IP networking issues on android 4.2.x
PS: I control both the phone and the servers that i'm trying to reach and can't see any traffic coming from the phone on the server.
PS1: I couldn't reproduce the issue with android 4.2.2 only with 4.2.1 (i've also tested android 4.4.4 and couldn't reproduce) i've tested 2 different phones with 4.2.1 and the problem reproduces.

This seems like an issue of handshake and IP Negotiation on the phone. Please see what options you have in terms of DHCP and IPV6 Settings. Please also take a close look at the DHCP Lease time of WiFi-3.
Also Please post in Galaxy Nexus Q&A, Help & Troubleshooting so that the right experts for your device may be of help.

Thank you
Moved here http://forum.xda-developers.com/galaxy-nexus/help/networking-issue-android-4-2-1-galaxy-t2886208
IPv6 is disabled
DHCP is similarly configured on all networks. different IP classes. IP addresses change correctly every time. As i'm able to connect to everything i try except that certain website i don't think it's something related with dhcp.

[Completed] Is accessing RPI through vnc while tethered to (LG G3 w/ CyanogenMod 13) possible?

I've tried searching some of the posts for this situation specifically but none seem to address it. So here's my situation:
Have a LG G3 (rooted) with CyanogenMod 13 installed.
-Servers Ultimate app
-Rpi3
I can/have tethered the RPi3 to my G3 successfully, I have also used a hotspot successfully. I am able to access with both SSH and VNC as long as my laptop is on the same network (hotspot) as my tethered RPI3. But I am as of yet still unable to access from the WAN. Is that possible?
I stated that I have the Servers Ultimate app because it has several server features that allow port forwarding but I have not had any success.
I have also noticed that my IPV4 address is distinctly different than my public IP, I assume this is because of Cellular NAT? Either way whenever I port scann ANY port that I've tried to open it always is returned as either Timed out or cannot detect as open.
Has anyone attempted this? AGain, Im sorry if I wasted time asking a redundant thread but I have not seen anyone post about this specifically more so if they can access on a LAN connection which I have already been successful at. Anyway, thanks for any replies.

Hi !
Was it working fine on a stock rom ?
I would suggest you to post this particular issue on the dedicated rom thread as only the developer knows what and how.
Good luck !

Router reboot required to receive OTC for 2FA codes on phone

At first a reboot of the phone worked, but later I found that if I rebooted the router the codes would come through but not the previous sent codes, only newly made 2FA code requests. I have a Netgear 6300R2 Router with a second router, Netgear R6300V1, as an extended wifi only router wired together with Ethernet. I have multiple phones that have no problems with 2FA codes, only the new phone Ulefone Note 11P, which is the only phone running Android 11. This phone also has the problem of the new standard for Mac Address assignment as automatic. Since I made the home network use Mac address as the requirement for access to WIFI and assigns a static IP address to each device and has 20 addresses in the router setup. The only way I could get this phone to work on this network was to have one IP slot in the 20 not defined in the DHCP IP address list. So, for the life of me I can not find or do not know how to ask the internet for any info on this type of problem since many phones are running Android 10. Most people probably have newer equipment than I do so the problem is not showing up yet, but I imagine it will when all the Internet security is using Mac addresses to secure the network from unknown devices, an issue that has come up many times. So, if you could point me to some better router software I could load on the routers to handle the Mac addressing problems and have the right protocols built in for 2FA (2-factor authentication) I would try that. It must be a combined problem with Android 11 Wifi settings and router setting for it to work this way. After rebooting the router and receive code all day, the next morning the codes fail to show again, and I reboot the router again. Also, I am in the habit of using Airplane Mode or turning off data and WIFI overnight to prevent access from all those data hungry PUPs connected to the phone over the internet. Thank You for your help. The routers are updated with the latest Netgear software.

bmaz121 said:
At first a reboot of the phone worked, but later I found that if I rebooted the router the codes would come through but not the previous sent codes, only newly made 2FA code requests. I have a Netgear 6300R2 Router with a second router, Netgear R6300V1, as an extended wifi only router wired together with Ethernet. I have multiple phones that have no problems with 2FA codes, only the new phone Ulefone Note 11P, which is the only phone running Android 11. This phone also has the problem of the new standard for Mac Address assignment as automatic. Since I made the home network use Mac address as the requirement for access to WIFI and assigns a static IP address to each device and has 20 addresses in the router setup. The only way I could get this phone to work on this network was to have one IP slot in the 20 not defined in the DHCP IP address list. So, for the life of me I can not find or do not know how to ask the internet for any info on this type of problem since many phones are running Android 10. Most people probably have newer equipment than I do so the problem is not showing up yet, but I imagine it will when all the Internet security is using Mac addresses to secure the network from unknown devices, an issue that has come up many times. So, if you could point me to some better router software I could load on the routers to handle the Mac addressing problems and have the right protocols built in for 2FA (2-factor authentication) I would try that. It must be a combined problem with Android 11 Wifi settings and router setting for it to work this way. After rebooting the router and receive code all day, the next morning the codes fail to show again, and I reboot the router again. Also, I am in the habit of using Airplane Mode or turning off data and WIFI overnight to prevent access from all those data hungry PUPs connected to the phone over the internet. Thank You for your help. The routers are updated with the latest Netgear software.
Click to expand...
Click to collapse
For the DHCP/IP problem I know very little to help your issue. Other alternatives you can try is alternative Software for your router instead of the one from Netgear. I have found just from a quick search Openwrt and DD-wrt, both of which are linux based and have their own limitations.
As for the Openwrt build/s, WIFI only works in 802.11g, but 802.1an/ac work only with limited functionality or not at all. That may not seem so important considering you would only use it for the WAN/LAN ports.
As for DD-wrt, your best bet is to skim through their forum posts to figure out what works and what doesn't. (DD-wrt contains non-FOSS drivers from Broadcom, which they don't release to public, so better compatibility in general)
You can always use another wifi extender in your combo (or stick with it, if that's not the issue).
Best of luck in solving your problems.

Slim K said:
For the DHCP/IP problem I know very little to help your issue. Other alternatives you can try is alternative Software for your router instead of the one from Netgear. I have found just from a quick search Openwrt and DD-wrt, both of which are linux based and have their own limitations.
As for the Openwrt build/s, WIFI only works in 802.11g, but 802.1an/ac work only with limited functionality or not at all. That may not seem so important considering you would only use it for the WAN/LAN ports.
As for DD-wrt, your best bet is to skim through their forum posts to figure out what works and what doesn't. (DD-wrt contains non-FOSS drivers from Broadcom, which they don't release to public, so better compatibility in general)
You can always use another wifi extender in your combo (or stick with it, if that's not the issue).
Best of luck in solving your problems.
Click to expand...
Click to collapse
Thanks for that, great idea! What I find though, with Extenders, is that they require you to have your base station WIFI on 24/7 where my set-up the base, which is right next to me, is off and the 2nd router is WIFI on. This keeps me from being 2.4 or 5.0 waves passing through my body.

bmaz121 said:
At first a reboot of the phone worked, but later I found that if I rebooted the router the codes would come through but not the previous sent codes, only newly made 2FA code requests. I have a Netgear 6300R2 Router with a second router, Netgear R6300V1, as an extended wifi only router wired together with Ethernet. I have multiple phones that have no problems with 2FA codes, only the new phone Ulefone Note 11P, which is the only phone running Android 11. This phone also has the problem of the new standard for Mac Address assignment as automatic. Since I made the home network use Mac address as the requirement for access to WIFI and assigns a static IP address to each device and has 20 addresses in the router setup. The only way I could get this phone to work on this network was to have one IP slot in the 20 not defined in the DHCP IP address list. So, for the life of me I can not find or do not know how to ask the internet for any info on this type of problem since many phones are running Android 10. Most people probably have newer equipment than I do so the problem is not showing up yet, but I imagine it will when all the Internet security is using Mac addresses to secure the network from unknown devices, an issue that has come up many times. So, if you could point me to some better router software I could load on the routers to handle the Mac addressing problems and have the right protocols built in for 2FA (2-factor authentication) I would try that. It must be a combined problem with Android 11 Wifi settings and router setting for it to work this way. After rebooting the router and receive code all day, the next morning the codes fail to show again, and I reboot the router again. Also, I am in the habit of using Airplane Mode or turning off data and WIFI overnight to prevent access from all those data hungry PUPs connected to the phone over the internet. Thank You for your help. The routers are updated with the latest Netgear software.
Click to expand...
Click to collapse
Update: 9-26-21 3:31PM PST I did some reading on different Qos settings and can see a potential problem, so I unchecked Qos completely. All the 2FA codes are coming through now. I have to wait another day before being sure, but I think that may have been the problem. It also had a problem logging on to WIFI which had that too. So, my question now is, What does Qos have to do with 2FA codes coming through. The codes are no normal MMS messages so is it the software in the router being old and not knowing about 2FA protocols with Qos or what?
Also, I had a heck of a time logging in to the site, and after I did, I had to reload the site in order to see my post which took too long to find. Where is the "See your Post Button"?