Wifi problem since upgrade in iMac 27"

Since a copuple of days my wifi stop work suddenly. I can't detect any wireless network on my imac 27" with 10.7.4. Must restart to work. I Reinstall my OS no problem since updated to 10.7.4. Can somebody hel me? Please.

Hi all,
To start a point on the server changes between 3.2 and 4.1 :
* We went from a 32-bit Ubuntu server to a 64-bit and have followed the installation procedure of 4.1 by changing the settings of linux such as requested
* The problems described are only in Apex, so we repeat an installation now in case we made an error
I tried to use TKPROF but I did not find a lot of information in the result output so I gave up. I certainly did not understand all !
I use the view apex_workspace_activity_log to find something ... and I find a lot of things but nothing directly closed to the problem.
At this point I have to explain our applications organisation :
* A connexion with validation via LDAP (AD) (no problem)
* A core application as a crossroads to other applications (via URL and &SESSION.)
It seems that this central application have never log in apex_workspace_activity_log ? very strange, like this application are in cache ?
In addition, we are often disconnected after some idle time.
The problem is like a random time out (10 to 20 seconds) whatever the application used (builder or user application). this is not a problem specific to an application.
We have no idea to search ... so we test a new install, maybe parameters on Ubuntu ?
Thanks for your answers.

Similar Messages

  • Wifi problems since 10.5.8 Update. Even after Snow Leopard Upgrade.

    Wifi problems since 10.5.8 Update. Even after Snow Leopard Upgrade.
    Is there any way to use a 10.5.7 wireless .kext files on Snow Leopard? And where can I find the files?

    Ok, I have the fix!! After several frustrating days it finally just works.
    The process:
    Upgrade your Macs to 10.6 (Snow Leopard)
    Powercycle your modem AND time capsule / airport TWICE
    Reset your time capsule with a pin or paperclip on the back
    Follow the prompts to setup your time capsule / airport access
    -- On your Macs
    Go to System Preferences > Network > Airport > Advanced > TCP/IP
    Click "Renew DHCP Lease" then click "Ok"
    Click Apply
    Turn off Airport
    Turn Airport on
    IT WORKS!!!
    One of the magical people at tech support walked me through it earlier today. The whole process took about 1.5 hrs because Show Leopard takes about an hour to install on one machine.
    Hope this helps-
    Joshua

  • TS1398 Still having problems with my ipad wifi connection since upgrading to IOS 6.  Can Apple do something about it the soonest possible time.  I don't have this kind of problem using IOS 5.1.1 Can you at least put back the 5.1.1 if you cant find a solut

    So disappointed with IOS 6.  I'm having weak wifi connection since upgrading to it.  Can Apple do something about it? Can you at least reset it to IOS 5.1.1?

    Sorry Jim for the wrong question because I'm getting frustated with my IPAD since I can't use it for surfing internet with a faster speed.  Ipad was very convenient to use until this IOS 6 upgrade.  Tried all the suggestions in the forums but still gets back to weak wifi connection.

  • Ipad3 problems since upgrading to ios8n

    Is anyone else experiencing these problems since upgrading to iOS 8?
    - Need to touch screen several times for a nornal one touch action (note: Screen size/position changes a bit after each successive try.)
    - keyboard response slow at times and at times freezes
    - screen content/image has expanded slightly but enought to put some perimeter icons and controls outside/off the screen.
    Are there fixes?
    ios7 worked beautifully!!! Why won't Apple allow their currently loyal ( but frustrated)  clients to revert back to ios7?

    Hi Go to settings Restore  back, to Factory, settings After Restore use same Apple ID & password, then you will get all your apps & data, back. This will get rid of any bugs. I do this every 2 months, or so on iPhone & iPad. Cheers Brian

  • Any Bluetooth audio problems since upgrading to ICS?

    Hi.
    Was wondering if anyone has had any Bluetooth audio problems since upgrading to ICS?  In particular, have you had any stuttering and/or pauses in streaming since the upgrade?
    I use a MW600 with my phone and I get stuttering and pauses every few minutes between the phone and the MW600 which is very annoying - to the point where I can't reliably use the phone for audio any more.
    Thanks
    Savcom

    Sorry but it seems to be a problem some users are experiencing. It's already been reported so hopefully there will be a fix for this soon.
     - Community Manager Sony Xperia Support Forum
    If you're new to our forums make sure that you have read our Discussion guidelines.
    If you want to get in touch with the local support team for your country please visit our contact page.

  • Problems since upgrading to Mavericks

    I am experiencing problems with CC applications since upgrading to Mavericks. Mostly Screen and display issues.
    In Photoshop, the top menu bar where the red, yellow , green window buttons normally sit has disappeared and it seems I cannot drag the window down to reveal (if that is the problem)
    In Indesign, The program opens but I cannot see any workspace at all, even when I open an existing ID file.
    Premiere Pro, Bridge,  appear to work OK
    After effects and Muse indicated both required upgrades, yet the CC application Manager does not indicate any upgrades required or available.
    I have not tried other apps.
    Is anyone else experiencing problems since upgrading to Mavericks and if so, does anyone know if Adobe are working on fixes?

    I upgraded to Mavericks on two computers and have display problems too! I have CC on one Macbook Pro (2011) and CS6 on another (2012) and I'm now almost positive my display problems are triggered by InDesign. I don't have to be doing anything special, and I don't have to be working in InDesign at the time, but InDesign has to be open and I get things like this:
    Once it turns magenta or green, that's when I have to boot the system. I can still work with the glitchy display before it turns colors and if I'm still able to quit InDesign while it's glitching, the display goes back to normal. Same on both computers and the 2011 one has a new logic board in it.
    At first I thought it had something to do with connecting my hard drive or my external display, but the display issues happened with both computers with nothing hooked up. Those are ruled out now. I took my 2012 computer to Apple and they told me it was a software issue and all my hardware is ok. Obviously they didn't fix the software issue because it's still happening.
    This is not normal and needs to be fixed soon!

  • Has anyone else had issues with dropping the wifi connections since upgrading to Yosemite

    has anyone else had issues with dropping the wifi connections since upgrading to Yosemite

    Looking at the Yosemite forum, it is obvious that this is a very common issue.  You might want to post in that forum for help and advice.
    OS X Yosemite

  • Problems since upgrading to v9.10

    Has anyone else encountered problems since upgrading to v9.10?
    Firstly there appears to be an issue with OLT no longer working in Firefox (3.6) as the "Build Scenarios" lists (select scripts) don't populate. Fortunately it still works in IE7, so I can at least revert to that.
    Apart from that, what's more of a problem is that I've found some previously working scripts are no longer working in OLT (but I haven't yet found a pattern).
    e.g. 1) One webservices script for product 'A' works, yet another for the same product comes back with "Orphaned agent" and "Failed to load script class for script X".
    e.g. 2) A similar set of scripts for a different webservice 'B' also has one working and the other with the same errors generated.
    e.g. 3) I have some web scripts that work, but others come back with the errors shown.
    I have also noticed that if I attempt to run multiple scripts e.g. load a previously working scenario containing 12 scripts, none of the scripts runs (as the agent has failed to start because of at least one of the scripts). The same is true if I try and run a single working script with a single non-working script; both fail with the message from the non-working script (both would be using the same agent).
    So far I have only tried converting a (new copy of a) single script to the v9.10 format but that didn't seem to make a difference. Pre-v9.10 scripts should still work in OLTv9.10 though; the conversion shouldn't be necessary.
    I have tried the usual things (re-starting the services and even the OracleXE database). Any suggestions?

    I too have FF3.6.3 but after signing in, I get the Build Scenarios page displayed but the "Select scripts & user-defined profiles" box with "Path: Scripts Only" list has nothing in it. Changing to "Scripts and Directories" makes no difference, still nothing is shown in the list. The repository should have multiple directories with multiple scripts (as shown when I try the same thing in IE7).
    I now suspect this too may be down to some problem during the upgrade of the DB from v9.01.1 to v9.10 the odd thing with the script failures is the error doesn't seem to indicate anything wrong with the script itself; just that the agent failed to load the script. You get OLT Server Warnings that say "Stopped Autopilot because of error on agent "[name]" and the VU Grid shows my (single) VU with error "Failed to load script class for script [name]".
    One particularly odd thing is that if I try adding 2 scripts in the same batch (a working and non-working one) with a delay between them the following happens:
    1) VU1 with working script starts and completes OK (total time around 48s)
    2) VU2 starts after delay (120s) but immediately comes back with the OLT Server Warning.
    3) *BOTH* VUs on the VU Grid now show the same error about the agent (despite the 1st VU having completed sucessfully).
    The agent seems to run happily with a working script until it is asked to load another (non-working) script which then kills the agent?
    Here's the relevant section from the databaseConfig.log from when the upgrade was installed, as I suspect this is where the problem started:
    +[Apr 16 10:21:42] INFO (SchemaUpgrader.java:43) - Starting upgrade for schema Oats+
    +[Apr 16 10:21:48] INFO (SchemaUpgrader.java:50) - Schema Oats is version 9.01.1+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script db_users.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script init_ats_dbs.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script oats.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script oats_template_data.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script olt.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script olt_sample_data.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script olt_template_data.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script otm.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script otm_sample_data.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script otm_template_data.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4b_to_v4c Oracle.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4b_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4d Access.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4d SqlSrv.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4e Access.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4e Oracle.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4e SqlSrv.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4f Access.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4f SqlSrv.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4e Access.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4e Oracle.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4e SqlSrv.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4f Access.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4f SqlSrv.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4e_to_v4f Access.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4e_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script Update v4e_to_v4f SqlSrv.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script upgrade-oats.9.01.1.sql does not match the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:71) - Script upgrade-oats.9.10.1.sql matches the filter+
    +[Apr 16 10:21:48] DEBUG (SchemaUpgrader.java:82) - Script upgrade-olt.9.01.1.sql does not match the filter+
    +[Apr 16 10:21:48] INFO (SchemaUpgrader.java:89) - Processing upgrade file upgrade-oats.9.10.1.sql+
    +[Apr 16 10:21:48] INFO (SqlScriptRunner.java:51) - Running script file C:\OracleATS\data\scripts\en\upgrade-oats.9.10.1.sql+
    +[Apr 16 10:22:05] INFO (SchemaUpgrader.java:96) - Upgrade complete for schema Oats from version 9.01.1 to 9.10.1+
    +[Apr 16 10:22:05] INFO (SchemaUpgrader.java:43) - Starting upgrade for schema Olt+
    +[Apr 16 10:22:05] INFO (SchemaUpgrader.java:50) - Schema Olt is version 9.01.1+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script db_users.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script init_ats_dbs.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script oats.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script oats_template_data.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script olt.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script olt_sample_data.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script olt_template_data.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script otm.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script otm_sample_data.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script otm_template_data.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4b_to_v4c Oracle.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4b_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4d Access.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4d SqlSrv.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4e Access.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4e Oracle.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4e SqlSrv.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4f Access.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4c_to_v4f SqlSrv.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4e Access.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4e Oracle.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4e SqlSrv.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4f Access.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4d_to_v4f SqlSrv.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4e_to_v4f Access.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4e_to_v4f Oracle.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script Update v4e_to_v4f SqlSrv.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script upgrade-oats.9.01.1.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script upgrade-oats.9.10.1.sql does not match the filter+
    +[Apr 16 10:22:05] DEBUG (SchemaUpgrader.java:82) - Script upgrade-olt.9.01.1.sql does not match the filter+
    +[Apr 16 10:22:05] INFO (SchemaUpgrader.java:101) - Nothing to do for schema Olt. Schema version stays 9.01.1+

  • Trying to open youtube, QuickTime cannot open video.3gp, only a problem since upgrading to Mavericks

    trying to open youtube, QuickTime cannot open video.3gp, only a problem since upgrading to Mavericks, what do I need to do please ?

    You're right. It wasn't QuickTime itself. I solved all the problems myself.
    The main reason why QuickTime files weren't working was because the newest audio driver from Creative released July 2007 (using their autoupdate) is apparently for Windows Vista (it has the name Vista in the update title). Why that update showed up on my Windows XP Pro system, I have no idea. So, I went to Creative's site and got the driver before the latest release, and all works well.
    The Microsoft update (from June 2007, I noticed today, not July) is another issue. It's based around the file P17RunE.dll, which is something from Microsoft for the SoundBlaster. Not sure what it does, but I don't need it.
    Sorry for wasting all your time on a non QuickTime issue, but thanks for the help.

  • Itunes problem Since upgrading to window10

    ITunes problem Since upgrading to window10, my ITunes cannot see the My Cloud drive, also I keep getting an error when my WC control panel tries to scan the content.This drive has worked fine for almost a year and since upgrading to windows 10 my smart TV's and my other devises can't find the drive I have updated the firmware, done a factory reset. but still have massive problems.Anybody any Ideas

    This is what I did, In windows credentials from the settings menu I added a windows credential using the IP address, and then the name of the pc with log in details. But during my messing about I also mounted the drive and deleted my C:drive Itunes folder. then re scanned my music once I could set the parameters to the right folder.Its working but I have to admit I am not sure which one solved the problem. WD still working on a reply.Hope you get it sorted.

  • IPad mini wifi problems since Yosemite Upgraded

    SInce upgrading to Yosemite on my iPad 2 Mini, the wifi has slowed massively! Is there a fix?
    thanks!

    First of all, I would be totally impressed if you managed to install Yosemite on your iPad.  I can only assume you didn't mean that.
    Here is a link to some tricks that have worked for other people. 
    http://www.iphonehacks.com/2014/09/fix-ios-8-wifi-problems.html

  • Wifi & Battery Problem since upgrading to ios 8.0.2

    me upgraded my iPhone 5s to iOS 8.0.2 but I have a problem about Wifi and Battery !!! my wifi disconnect every 1 minute and when i turn it Off then On it will work for 1 minute and will disconnect again and i have to turn it Off then On again ! And my battery is getting low very faster since upgrading to ios 8.0.2 while i installed just 3 Program (Line-Viber-Clash of Clans) !!! please heeeelp me

    Hi there Mehrdad Nofar,
    It looks like there may be a few resources for you. For the Wi-Fi issues, I would recommend taking a look at troubleshooting steps in the article below.
    iOS: Troubleshooting Wi-Fi networks and connections
    As far as the battery concerns, there several things you can do to isolate the cause of the issue. The page below outlines tips to maximize your battey life and isolate any background activities. 
    Apple - Batteries - Maximizing Performance
    Hope that helps,
    -Griff W.

  • Problem since upgrading to Yosemite: iMac wont boot up and simply displays a '?' symbol

    my iMac has been slow since upgrading to Yosemite and has now stopped working completely - when I boot up all I get is this screen (for some reason picture has turned upside down when I uploaded) any ideas?

    Startup – Computer Stops or Delays
    Startup Issues - Resolve
    Startup Issues - Resolve (2)
    Startup Issues - Resolve (3)

  • Battery problems since upgrading to IOS 5.1.1

    My battery which was workinng fine until the upgrade, discharges at an alarming rate since upgrading to IOS 5.1.1.  I have to have a cord almost everywhere I go just to keep it with battery liife.  I can lose at least 40% andd hour, I have a co-worker with the same problem.  I have an Iphone 4 and she has an Iphone 4S.  Please help me fix this ASAP.

    I would like to downgrade also. Having to charge 3 times a day is just dumb. I purchased my 3G wifi iPad for a small fortune just 3 or 4 months ago and the older OS worked fine, charge once every other day. I guess I learned my lesson about being an early adopter with Apple products - upgraded to IOS 5 - bummer - got the "fix" - still a bummer.
    I want to downgrade the os on my IPad .... Apple? Hello? Are you listening?

  • IPad 2 Wifi Problems after upgrading to iOS 6

    I Updated my iPad 2 to ios6 then day iOS6 was released, ever since then i have been unable to connect to the wifi. I've reset the network setting and the wifi works for about 5 minutes until i go on any apple app ( itunes, app store, maps etc). I've reset the Network settings more than once, I've turned the HTTP proxy to auto, I've pressed Renew Lease, I've unplugged the wifi, and I've pressed Forget this network. Reluctantley i updated my ipod touch 4 gen to see if iOS 6 was the problem and I now have the exact same problem on my ipod touch. Someone Help!!

    iOS 6 Wifi Problems/Fixes
    Fix For iOS 6 WiFi Problems?
    http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
    Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
    http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
    How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
    http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
    iOS 6 iPad 3 wi-fi "connection fix" for netgear router
    http://www.youtube.com/watch?v=XsWS4ha-dn0
    Apple's iOS 6 Wi-Fi problems
    http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
    ~~~~~~~~~~~~~~~~~~~~~~~
    Look at iOS Troubleshooting Wi-Fi networks and connections  http://support.apple.com/kb/TS1398
    iPad: Issues connecting to Wi-Fi networks  http://support.apple.com/kb/ts3304
    WiFi Connecting/Troubleshooting
    http://www.apple.com/support/ipad/wifi/
    How to Fix: My iPad Won't Connect to WiFi
    http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
    iOS: Connecting to the Internet
    http://support.apple.com/kb/HT1695
    iOS: Recommended settings for Wi-Fi routers and access points  http://support.apple.com/kb/HT4199
    Additional things to try.
    Try this first. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
    Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
    Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
    Another thing to try - Go into your router security settings and change from WEP to WPA with AES.
    How to Quickly Fix iPad 3 Wi-Fi Reception Problems
    http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
    If none of the above suggestions work, look at this link.
    iPad Wi-Fi Problems: Comprehensive List of Fixes
    http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
    Fix iPad Wifi Connection and Signal Issues  http://www.youtube.com/watch?v=uwWtIG5jUxE
    Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
    Unable to Connect After iOS Update - saw this solution on another post.
    https://discussions.apple.com/thread/4010130
    Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
    ~~~~~~~~~~~~~~~
    If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
     Cheers, Tom

Maybe you are looking for