WiFi connection fails at startup

Change your router channel number. Most times this works & is all you have to do.

System Preferences>Network

Click the Assist Me button.

In the next window that pops up, click the Diagnostic button & do the necessary.

Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer. See these basic networking KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide

http://support.apple.com/kb/HT2712 Using network locations in Mac OS X

Manually provided DNS server addresses are higher priority than DHCP's

http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting

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What to do when you can't connect to the Internet Also, run the Airport Utility app which is located inside the Utilities folder.

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If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.

If using Apple's Airport, please re-post over in one of the AirPort Forums.

Finally solved with this simple solution:

http://osxdaily.com/2012/08/02/fix-os-x-mountain-lion-wireless-connection-proble ms/

This is the second step in the 'This solved my question' of the following post:

https://discussions.apple.com/thread/5461185?answerId=23445708022#23445708022

I have exactly the same problem. At startup the computer fails to connect to the wi-fi automatically.

If I switch off the wifi and then on again, it connects easily.

The connection is not lost if the computer stopped (stand by) instead of shutting down.

I have also tried assigning manually the DHCP, as I noticed that at startup it fails to obtain the IPV4 address automatically, but the problem remains.

I have noticed the problem after installing 10.8.3. My computer is a retina MBP 2.3 GHz

Could you solve the issue in some way?

I have the same problem too on my brand new 13" Mabook Pro.

It was fine until I did an upgrade, and now people have pointed out here, I have to stop the wifi and turn it on again for the connection to establish.

Looks like a update bug.

HELP!!!!

I'm having a similar issue with my 2009 iMac (MID) running 10.8.3. I am using a Linksys E2500 router.

On start or wake up I have to select my wifi network every time and enter the password. I check the box to remember the network but it never does. I keep getting the message that it cant find any preferred networks.

As long as the Mac stays on and doesnt restart or enter sleep mode it works just fine.

If the computer enters sleep mode it does not connect upon waking up. Again I have to select my network and enter password. I have to do this every time.

If I turn off wifi and turn it back on it does not solve the issue. I again have to select the network as it forgets every time the wifi card is turned off.

I have tried several steps to correct the issue including deleting all preferred networks, renewing DHCP lease.

I have reset the router several times. I cant figure this out.

Apple support refered me to Linksys support who wanted to charge me to fix the issue that they say is an Apple issue not the router.

My 2011 (Late) MacBook Pro running 10.8.3 does not have this issue. We have a HP Envy, 2 PS3's, 3 iPhones, and an iPad and all connect just fine.

Anybody having this issue? Any suggestions?

I found a solution that has worked for me.

I entered in Utility Airport, selected my Time Capsule, then Modify, Wireless tab, Wireless options and finally selected a channel instead of leaving on automatic.

I selected channel 36 on the 5 GHz. However, do not think it is important which channel you select as long as there are no interferences.

So far so good

I was able to fix the issue for myself. I am running OSX 10.8.4

Step 1: Go to Applications >> Utilities >> Keychain

Step 2: Locate System in the left menu and select it.

Step 3: Locate your wireless newtwork in the list select and delete the entry. You will be asked to enter your system password to delete.

Step 4: Click on your wireless icon and select Turn Wireless Off then click open network preferences.

Step 5: Under your wirelss select advanced

Step 6: Delete your wireless network under Preferred Networks

Step 7: Turn wireless back on

Step 8: Connect to your wireless network and re-enter your security information.

I have the same problem. Tried all the solutions mentioned above but no go :-( Just as the others, I have the problem that it won't connect at startup. Get a self-assigned IP address. But if turn off the WIFI and then turn it on again it works fine.

Any other ideas? This is a problem I just started noticing yesterday, though I rarely restart my computer, a 2012 MBA with OS X 10.8.4. I also have a 2011 MBP at home with OS X 10.8.4 but there is no such WIFI problem on that computer.

Another interesting note. My home network consists of a NAT router from my ISP connected to the internet with WIFI off and then two Airport Expresses, one on each floord, set up as a roaming network. It all works fine, except for this little oddity with the MBA. Upon closer investigation, it also turns out that if I start the MBA when I am close to the downstairs Airport Express - a 1st Gen - then there is no problem connecting at startup. But if I start the MBA near the upstairs Airport Express - a 2nd Gen - then the problem occurs.

Can't seem to get my head around the problem. Any help would be appreciated.

I've got the same problem: WiFi Connection fails at every startup.

After running the networking assistant it starts working properly.

This is really annoying. The solutions mentioned above did not work.

As I figured out this is a general problem with new the macbook air.

Maybe it concerns the new MBP early 2013 as well because I'm using

a brand new Macbook Pro Retina 15" early 2013 with OS X 10.8.4 (12E55)

Message was edited by: siriussurfer Edit: Link added.

I have the same problem.

MBA mid 2013.

I did the last update but it didn't work. (OSX 10.8.5)

After boot wifi is always off.

Switch to on I can connect without problems.

The problem is always after boot. Wifi is always turned off

Tried all suggestions and no luck.

Someone has the fix for this problem?

Thanks very much, this solved my problem.

I had previously tried both steps independently (erasing the keychain password and in another step to remove the network in the preference panel), but without results.

It is thus important to complete both steps and being disconnected from the wifi network.

(independenlty from the macos version, I noticed that the problem was not appearing with a WEP password, and only with a WAP2 password).

At least, I will now be able to also create a closed network.

Thanks again for posting a reliable solution. I wished that Apple had worked this out.

Unfortunately Kevin, my enthusiasm was misplaced, since I am again having the issue.

Although my own network will display correctly in the Wi-fi menu, selecting it will not work.

I need to select 'Join Other network…' > 'Show Networks' and then only when selecting my own network, I will be connected to it.

I am wondering if this could be an issue related to the airport station that I am using an Airport 802.11g