Unable to connect to WiFi Network Following Upgrade to OS X 10.9.1

I wanted to post thus to ask if anyone is experiencing issues with WiFi following upgrading to 10.9.1?
On Monday I upgraded to 10.9.1 from 10.9. Immediately following the install and reboot, plus for the next four hours - all was well. I have booted up the MacBook this evening and now I am unable to connect. The following is being reported in Console;
time airportd: _doAutoJoin: Already associated to "network name". Bailing on auto-join
time kernel: Airport: Link a Down on en1. Reason 8 (Disassociated because station is leaving)
I have connected to the network many times previously without an issue. My iPad, iPod and my iPhone connects fine. Also a couple of a Windows 7 SP1 machines connect fine.
I have saved out the airport plits file, creating new settings from scratch - didn't work. Rebooted, etc - didn't work. Put the initial plist file back - still doesn't work. Currently unable to reboot the router.
Is this an issue with 10.9.1?

Got it working... Needed to reconfigure the Network settings and reboot the router.

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check this link out for more info
http://www.ehow.com/how_4537240_using-wifi-data-plan-t.html.
I saw this in another post
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Well, I downloaded Pacifist and the 10.4.11 Combo Update. Pacifist verified the AppleAirPort and AppleAirPort2 .kexts on my drive as matching the ones in the package, but I forcibly reinstalled them anyway and rebooted. Still no luck -- now the network is back to the four-bars-no-bars death loop without even popping up the error dialog.
Luckily however Pacifist turned out to be the solution to the problem. A Google search on "Apple broke Airport" eventually led me to this thread with detailed instructions on rolling back to the previous version of the Airport driver, before the 2008-01 update: http://www.tuaw.com/2008/03/28/airport-extreme-update-2008-001-for-tiger/#c11509 504
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Download the Airport Extreme client software version 2007-004
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Download and install Pacifist from www.charlessoft.com.
Delete /system/library/extensions/io80211family.kext
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extract and direct it to extract the file to the
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So now my Airport works again, though without whatever security they put in with 2008-01, I guess.
I suppose I'll have to embargo future OS updates until this gets straightened out, or else re-rollback the io80211family.kext after each one. I sure would like to talk to whoever wrote this update at Apple!
Thanks for your time, BD.

Unable to connect to wifi network

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TomGeo wrote:
I put my (2 day old) iPT to sleep last night in the middle of watching some Netflix streaming video. When I woke it up this morning, the Netflix app tried to resume play and failed. The iPT started asking for a network password. I made a few careful attempts to enter it (it is one of those 64 random character things, and my iPT typing skills are nascent) and it failed to connect. Finally iPT began saying 'unable to connect' and stopped asking for a password. I checked the router, connected with my laptop, no problems there. Perhaps the router has some lockout after failed login attempts, but if so I could not discover the setting in order to reset it.
Finally, I reset the iPT network settings, and was able to connect and enter the password successfully.
My question is this: why did this happen, and can I be at all confident it won't happen again?
I've never had a similar problem with other wifi devices I've used with this router since setting it up over a year ago, so to my mind it is obvious there is a problem with the iPT wifi hardware or software. Needless to say, it is a pain to enter the wifi key once, let alone every few days.
Your post indicates that you are using WEP security. Do as Apple suggests and move to WPA or WPA2 security. WEP is obsolete and can be cracked in seconds with widely available software.
See http://support.apple.com/kb/TS1398

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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
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~~~~~~~~~~~~~~~~~~~~~~~
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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

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I recently bought à new mini iPad. The connection with wifi network is lost very often and therefor not Stable. I tried the tips such as forgetting the network and connecting again, but that doesn't help. What can I do?

Do #5.
Some things to try first:
1. 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.
2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
3. 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
4. Go into your router security settings and change from WEP to WPA with AES.
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~~~~~~~~~~~~~~~~~~~~~~~~~
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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
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http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
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http://www.youtube.com/watch?v=XsWS4ha-dn0
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~~~~~~~~~~~~~~~~~~~~~~~
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
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http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
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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

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This has only started happening in the past week or so
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I reset my network settings on the phone. This worked for a couple of hours and I could connect to the wifi upstairs, but now it won't connect again.
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Sounds like your wi-fi signal strength has degraded. Try rebooting your wi-fi router, or get it serviced.
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