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Captivate Wifi/3G data issue

Has anyone had a problem with the Captivate when in both WIFI and 3G coverage the phone will not download or open a webpage? If I shut off one or the other it works but if both are active it hangs up and doesnt download.

Is this by chance on an enterprise wifi access point? Such as one of those expensive cisco APs you find in schools and enterprise class networks? If so, there is currently a driver problem with the captivate connecting to it, but not trasnfering data. Whether the netwrok is encrypted or open doesnt seems to matter. Personally, I find this a bigger problem than the GPS issue. I had to use wifi static to manually set IP, subnet, etc. This is a workaround, not a fix.

jhannaman82 said:
Is this by chance on an enterprise wifi access point? Such as one of those expensive cisco APs you find in schools and enterprise class networks? If so, there is currently a driver problem with the captivate connecting to it, but not trasnfering data. Whether the netwrok is encrypted or open doesnt seems to matter. Personally, I find this a bigger problem than the GPS issue. I had to use wifi static to manually set IP, subnet, etc. This is a workaround, not a fix.
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Hey, I think I'm running into this issue at my workplace (we definitely use those Cisco APs, I see them all around). I'm connected, I have an IP, but I can't browse anywhere.
Here's the weird thing though: I can connect to the company's wifi in any other building (I guess different APs?) than the one I'm in and wifi works fine. It's just the building my cubicle's in that doesn't work and it's infuriating!

well thats dumb.

I had that happen once since I bought the phone on launch. I restarted my phone and it went away.

I've had this problem as well, usually my phone switches to only wifi pretty quickly though, so I don't notice much. The phone acts like it is using the 3G connection because the arrows are both indicating data coming and going, but nothing actually happens unless only one or the other is on.

i need to check this at more places but at home i have a standard dlink dl-624 router with no security over comcast. i think my issue initially was because of the wifi sleep policy (see below) but now i am just getting really really slow speeds. pages seem to load slower than 3G....(i mean really cinemaxHD is showing last of the mohicans in pan and scan)....also the pages time out very very frequently.....
Anyone having problems check out the advanced setting for wifi. The phone has a WIFI sleep policy. my default setting was to disconnect from wifi after the screen locks. my screen locks after 30 seconds. so basically it always looking for my network. you can change it to never.

I want to reiterate our findings again. There are multiple threads on other forums concerning this as well. When it comes to wifi, the captivate has a major problem. DHCP does not work on enterprise networks. Period. It is a driver issue. The network can be open or using any form of encryption, the results are thr same. I had numerous software, hardware and network analyst tackling this issue all week in my department. It is related in part to most enterprise networks not using a default subnet mask of 255.255.255.0. There is a workaround, but it is not a fix. You can either set a static from your static pool of ip's in wifi settings, or, if u connect to multiple networks, use wifi static from the market to remember and apply seperate static configs accross multiple networks which is what were having to do currently. This affects all captivates, one which we consider a major problem with deploying this phone to our other users.
Sent from my SAMSUNG-SGH-I897 using XDA App

I had the same problem and this is how a turn around the problem when I'm connected but cannot browse.
-Use Wifi Static
- DNS from google 8.8.8.8,8.8.4.4
- switch to airplane mode
- activate wifi
- test my conection (open the browser and surf)
- switch to phone mode
Hope it help

floppy__ said:
I had the same problem and this is how a turn around the problem when I'm connected but cannot browse.
-Use Wifi Static
- DNS from google 8.8.8.8,8.8.4.4
- switch to airplane mode
- activate wifi
- test my conection (open the browser and surf)
- switch to phone mode
Hope it help
Click to expand...
Click to collapse
Did this, Wifi Static was being used previously to bypass dhcp, and it correctly assigned the IP settings, used the static I assigned from our static pool of addresses. Still no data transfer over Cisco APs at work.

jhannaman82 said:
Did this, Wifi Static was being used previously to bypass dhcp, and it correctly assigned the IP settings, used the static I assigned from our static pool of addresses. Still no data transfer over Cisco APs at work.
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Click to collapse
are you able to access a website thru his IP address? in this case it's a DNS problem, try the Google DNS 8.8.8.8 - 8.8.4.4

floppy__ said:
are you able to access a website thru his IP address? in this case it's a DNS problem, try the Google DNS 8.8.8.8 - 8.8.4.4
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Click to collapse
Its hit or miss really, seems the wifi radio stack locks up and stops responding according to our trace logs. yes i have tried both our internal DNS server's as well as googles. Everywhere else works perfectly. But at work with our Cisco open (no security) APs, it doesnt work most of the time. Through whos ip address??? I have a static set from our static pool to make sure dhcp was not the culprit. Its def the device, and not my netwrok. I have over 100 of these APs deployed here.
Wifi works great everywhere else (at home with WPA2, etc). There is def a problem with enterprise cisco APs.

Netmask issue and cisco AP's
Posted this over in development thread.
http://forum.xda-developers.com/showpost.php?p=7698066&postcount=410
Make sure your netmask is correct.

Thanks jhannaman82
I just wanted to give a big thanks to jhannaman82 for posting his company's findings with these wifi issues. My wifi works 100% at home on my linksys tomato router (of course, with a netmask 255.255.255.0). But on my college campus they use an enterprise router setup with 255.255.0.0 and I have been going NUTS trying to figure out if it is my captivate or the network.
I can sometimes get a few minutes of working connection, but it always seems to crap out within 1 or 2 minutes.
I will attempt to fiddle around with switching the dhcp to static IP, and will post my results. Thanks!
edit: no luck with static IP fiddling so far. from my laptop (connected wirelessly), I gathered that the netmask is actually 255.255.248.0... when I set my captivate's netmask to anything other than 255.255.0.0, it does not connect. It says "connected" when I set the netmask to 255.255.0.0, but as usual no data will transfer (it seems). I'm at a loss. *shrug* Hopefully there's a driver update or something.

Thanks jhannaman82!
I just wrote a script with the GScript app: "ifconfig eth0 netmask 255.255.255.0", and have a shortcut on homescreen. The problem was that the netmask was wrongly set to 255.255.0.0 on my office wifi. Now all I need to do is tap on this shortcut at office, and the connection works!

Has anyone contacted Samsung about this ?

I'm hoping this gets fixed soon... This refuses to stay connected at my school. Huge pain.
I entered in an IP address and 255.255.252.0 for my netmask after seeing what it was on my computer and turn on flight mode and tested the wifi and now it's working. I'm not sure if it's just one of those fluke connections that I get... but we'll see.

[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.

[Q] Wifi doesn't work at home

Hi,
I have a problem with the wifi on my Samsung Galaxy S2 after I changed some settings on my home router. The wifi works anywhere else, just not at home.
What I changed was the router ip and wireless channel. Since then I have cleared all the wireless and browser settings in the phone and reverted back to the old settings on the router. Still doesn't work.
I've also tried having static IP. It doesn't work as well. It's only the internet. It connects to the router fine and I haven't had any problems with other gadgets and computers connecting.

Your tried turning on airplane mode for a few then reboot?
Your router doesn't have a sync button does it?
*signed

One thing you can do is delete the connection to your router on your phone, and connect again with new password from router. Do you have any other device beside your phone connecting to this router? If no, you need to test it. If yes and not connecting check the connection security, like wpa or wpa2. If all fail, reset router. This mean you will need to reconfigure your router. Check manual for more on your router.
Sent from my SGH-T989 using xda premium

Yes. View available wireless connections. Click your router. Then click "forget".
Then view again, click your router, and type the passphrase.

mrrick said:
Your tried turning on airplane mode for a few then reboot?
Your router doesn't have a sync button does it?
*signed
Click to expand...
Click to collapse
Just tried this and it didn't work.
My router is a cheap basic router that came from my internet provider. No such thing on it.

85gallon said:
Yes. View available wireless connections. Click your router. Then click "forget".
Then view again, click your router, and type the passphrase.
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Click to collapse
I've already reset anything wifi related on my phone. It hasn't worked.

Do you have something else that you can connect to wifi to see if the problem is your router?

85gallon said:
Do you have something else that you can connect to wifi to see if the problem is your router?
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Not in my home no. But like I said in the OP, the wifi on my phone works fine in other houses and hotspots. It's most definitely some kind of communication problem between my router and phone only but I'm not familiar enough with routers to know the problem and I haven't stumbled on anyone else on google having the same problem.
Two laptops, one Win7 and one OsX, are connected. Unfortunately I'm new in the area I live in and my girlfriend doesn't have a smartphone so I haven't been able to test if it's just my phone or just android or iPhones in general.
I can't think of a logical reason why it's like this

Maybe router is configured with wifi 802.11n and the galaxy only runs on b/g ?

If you're using WPA/WPA2 security, check that the
router is set to use AES encryption.
If you think you did your best. Its better to buy a new router then. )

maybe you could try unplugging your router?

Freestate said:
Maybe router is configured with wifi 802.11n and the galaxy only runs on b/g ?
Click to expand...
Click to collapse
I didn't change any of that. It's got a WEP encryption only as well.

[Q] How to Get on Home WiFi Network?

I have a Netgear WNDR4000 router. I am using WPA2 security, static internal IP addresses and a MAC table to control access to my home network. I have added multiple devices to my home network since I bought the router without any issues including an Android smartphone running gingerbread.
No matter what I do I cannot get my 300 to connect to the network. It does see the network SSID but it will not connect. I even tried the WPS button on the front of the router using the advanced settings on the 300 but still no luck.
I am beginning to think that the MAC address listed under the “About Device" menu item is not what the 300’s radio is actually broadcasting.
I have double- and triple-checked all the settings but I am getting nowhere.
Any help or suggestions you may have would be appreciated.

Does your smartphone support tethering? Connect the 300 to it to verify MAC address. You could TEMPORARILY reconfig your router to be open (no security) and confirm MAC address. Turn off MAC filtering to see if that is it. Get it to connect to something wide opeb and then begin layering on the security.
You have set up your static settings on the 300, correct? Sounds like you have DHCP disabled on the router...
Sent from my SCH-I510 using XDA

Thank you for your response.
I did finally decide to take all the security of the router and the 300 connected right away. Then I checked the router's "attached devices" list and it did verify the MAC address that the 300 was displaying. So I was able to clear that as an issue.
I still could not get it to connect with my WPA2 security turned on (my router needs that level of security to put out "N" speeds) on the 2g network.
Right; I have DHCP disabled on the router. All my devices, wired and wireless, get an assigned internal IP address and their MAC addresses are loaded into a table.
Every other device I've added to the router connects without a problem.
I decided to send the 300 back and I'll just wait for the Infinity to hit the market.
Thanks again for your help.

Hope your next one works as it should. Mine connects fine using WPA or WPA2, multiple manufacturers. Still waiting for OTA, rooted running .17 firmware.
Sent from my SCH-I510 using XDA

ptgay49 said:
Thank you for your response.
I did finally decide to take all the security of the router and the 300 connected right away. Then I checked the router's "attached devices" list and it did verify the MAC address that the 300 was displaying. So I was able to clear that as an issue.
I still could not get it to connect with my WPA2 security turned on (my router needs that level of security to put out "N" speeds) on the 2g network.
Right; I have DHCP disabled on the router. All my devices, wired and wireless, get an assigned internal IP address and their MAC addresses are loaded into a table.
Every other device I've added to the router connects without a problem.
I decided to send the 300 back and I'll just wait for the Infinity to hit the market.
Thanks again for your help.
Click to expand...
Click to collapse
Wtf... Send it back.... Wow!
Sent from my SPH-D710 using xda premium

PROBLEM: Obtaining ip address loop

Hello,
I have been experiencing this problem for a couple of days now, and it's driving me crazy. I tried all i could find on the internet (resetting the phone, the router, wiping cache, using static ips, deleting files in \data\misc\wifi\dhcp...), but when i try to connect to my wlan all is stuck in this "obtaining ip address" loop. The weird thing is that this never happened before, and involves all android phones at my house now, but not my windows 7 pc. Im on the latest vipersaga rom, and we have other phones, running jb. What could i do? is anyone experiencing this?
Thanks for helping

Quick and easy fix is to assign your devices static IP addresses on your router.
Is the router running WEP encryption? If so change it to WPA2.

SimonTS said:
Quick and easy fix is to assign your devices static IP addresses on your router.
Is the router running WEP encryption? If so change it to WPA2.
Click to expand...
Click to collapse
thanks, i solved it easily assignin the ip directly on the phone, i had had problems doing that just on my router. I had already WPA2 anyway