iPhone 4 cannot connect to home Wi-Fi

Hello,

I'm having a similar issue. As of about one hour ago, my iPhone 4 (running iOS 4.3.4) will no longer connect to my home wireless network. This has never happened before; wifi has always worked smoothly in the past. When I attempt to connect to the network by manually entering its respective password, it tells me that the password is incorrect (which is not the case). On a few occasions, it apears as though I am briefly connected to the network (as indicated by a checkmark next to the network name), but this quickly goes away and a notification appears informing me that the network password is incorrect. My attempts to resolve the issue have included:

-Hard reset

-Turning wifi off, then back on

-Selecting the network, choosing "forget this network", and typing in the password when the network appears

-Selecting "Other..." and manually entering the name, security type, and password for the network

-Resetting network settings

None of these attempts have resolved the issue. I would like to get this sorted out ASAP.

Any feedback would be greatly appreciated.

P.

P: I had your same issues. And I finally fixed it. I logged into my router and just restarted it (not reset it...just changed a setting, changed it back, hit Save, and that restarted the router). When the router rebooted, I was able to connect to the WiFi with my iPhone 4 again.

It didn't work for me. I have an iphone4, following up an iphone3 GS, since Friday. Worked till Sunday when 2 other iphone4 users visited my guestnetwork on de the wifi in the Time Capsule.

The 2 other devices still work properly on wifi home network. The Iphone is still able to connect woth public wifis.

No what to do?

Frans

Thanks to jawshoouh for the solution! This problem was very perplexing and quite frustrating in that it affected the three iPhones in my household ONLY; all of my other Apple products worked perfectly on my home Wi-Fi network.

A virtual tip of my cap goes to you, jawshoouh for a simple and effective solution! 

Hi guys my iphone 4 just had the same problem i took your advise and powered off my router and then repowered it back on problem solved..........for know at least no changes to any setting just off for 30 seconds then on. thanks heaps for that.

Hello to all,

This wifi connection issue (iDevice connected in WiFi but no datas transfert) comes with the 2 last ios firmware with idevices with wifi N mode (iphone 4 & ipad 2).

The workaround is to disable the WiFi N mode on your wifi router and back to WiFI G mode. This is the only way to get back a good WiFi connection to your iDevice. Hope this bug will be fixed in iOS5 . This WiFi connection problem has been encountered with many settopbox brands.

Cheer

Thierry

Thanks Brendon, after much research I found that rolling back the airport was the solution. My iPhone was not connecting to wifi but iPad, Mac, and other devices worked. I tried airport mode with wifi on, resetting the network connections, rebooting the phone and all failed to resolve the connectivity. We had 4 iPhones all with the same wifi connection issue. Thank You!

Well, the problem resurfaced for me about an hour after I thought it was resolved: once again, none of the three iPhones in my household can gain access to my home Wi-Fi despite the fact that an iMac and iPad have no such problems. All three iPhones have the most updated iOS versions and none have ever been jailbroken.

I have seen Thierry's and SlammyJ's proposed solutions, but I need directions as to how I can "roll back" my router. I have a 1 TB time capsule (2nd generation) and an Airport Extreme (most recent generation) in my home.

Thanks in advance to all for any guidance.

After reading all the posts here and trying most things, nothing has worked for me either. I've tried to find the 7.5.1 firmware but cannot locate it. My AE is only about 2 months old so I don't have any old versions of the firmware on my system. Can anyone point to a link to download it?

For those of us who haven't done this before, could you be more specific on step 5... When I click on Upload Firmware and the window opens, it opens up to the Documents folder. What is the path to the proper folder that would contain the 7.5.1 firmware?

Thanks!

My husband updated his Iphone 3gs on 7/23 and it dosn't connect to home Wifi anymore, I have not updated my iphone 3gs and it connects instantly to our home wifi, along with my tablet, laptops, and Blueray Player. We have followed every suggestion bought a new router, went to someone elses house, rebooted routers, restarted phone, restored phone, click forget network and started over... nothing has worked to make his phone connect to wifi except at airport and even then it flashes from wifi to E about 5 seconds after connecting to the wifi.

It has to be the update or both of our phones would be doing the same thing

for the record: same issue as others, iPhone 4 with latest firmware, Time Capsule with latest firmware, suddenly iPhone can't join the network. Downgrading the TC firmware did fix the problem. Thanks!!!!

Q: Is Apple aware of this and working on a fix (he asks hopefully)?

after downrevving the TC firmware and restoring connectivity, I uprevved the firmware again to test reseting the iPhone network settings. However, the iPhone is happy again. If it occurs again, I'll try the reset. Thanks!

This solved the problem. Apparently the firmware for Timecapsule 7.5.2 is NOT COMPATIBLE with the newest IOS update....

Geeezzzz Don't you think this is one of the first things they would test. I buy all Apple products figuring the interoperability will be perfect. Real sloppy work apple!!!

I am having the same issue. I found this link (http://forums.macrumors.com/archive/index.php/t-1065445.html) which provides information on how to find the file, which I also pasted below:

/user/library/application support/apple/airport/firmware/version.xml

Unfortunately, my Application Support folder does not contain an Apple folder.