MacBook Pro 2011 don`t accept Wlan Password

I had the same issue as you described. My router was using WPA2 encryption and I was asked constantly to enter password. I searched the web and someone mentioned that Mac OS X Snow L do not work well with WPA2. After configured my router to use the WPA encryption the first issue gone. My password was accepted and I saw full wifi connection icon on the menu bar. But I am not really connected actually, my connection drop constantly but the icon always shows full connection. I can tell you this is not a router issue and not a wifi channel issue.

The ! sign usually means that you are not getting a valid IP Address. Have you configured your Router for WPA/WPA2 security ? If so, try WPA2 only security first. If that does not work, then try Open and check if your connectivity is good. What wireless mode are you using ( 11a/b/g/n ) ?
Change one setting at a time and try to find out when the issue occurs so that will help identify the issue.

Please elaborate. What leads you to believe the new MacBookPros (2011) have a problem with their wireless hardware?

DrVenture,

Are you using a new macbook pro 2011 right now? If it is working for you what is your wifi set up? I have a mac mini 2010 and a macbook 2008 all working with the same router but not the new macbook pro 2011. It is obvious that something is wrong with macbook pro 2011's wifi hardware. My mac mini has snow 10.6.6.
See my post for detailed information about the problem.
http://discussions.apple.com/message.jspa?messageID=13148627

I have two MacBook Pro 15's (2011) sitting right in front of me. One is connected with WPA2/PSK security and the other is using WPA2 ENT PEAP. I am using Cisco 1142's with a 5508 controller and I have no problem getting onto the network.

Just curious, but can you give an idea of what you PSK password looks like? Are you using special characters or something? I could try a similar password in my setup and see if it works.

You could always try to turn up AirPort debugging to see what the client thinks it is doing, as well. Open a terminal and do the following:

sudo /usr/libexec/airportd debug +alluserland +alldriver +allvendor

Recreate the issue and post the debug output (in your kernel.log) to this thread.

to turn AirPort debugging off reboot or do:

sudo /usr/libexec/airportd debug -alluserland -alldriver -allvendor

I have problem with my Macbook pro 15 2011.

First mac for me, really disappointed !

Drop wifi all time, impossible to surf.

Works greats on Windows 😟

Driver problem on mac os x ?

alternate,
Do you have a MAC Address based filter list or something setup for devices to get on your wireless network ? Check your Access Point to see if you have a MAC Address based filter list.
Also make sure your DHCP Server has enough IP address's to give and you haven't restricted the range.

Odd - the headache I have here Im using WPA2 and my iPhone connects just fine, the windows 7 phone doesnt, the PC laptops all connect fine, by my co-rporducer 2009 or mac book pro refuses to connect.

This is with BT infinity wireless router in the UK. Password is just letters and numbers.

alternate,
what is the make/model of your access point ? Those details might help some other folks here.
Also did you get a new model of the same AP that you had before or did you get something else.

I am having the same problem, but not so sure its the 2011 MBPro. I have an MBAir, a MBPro 2006, and an MBPro 2011. Ever since I picked up my 2 MBPros after a data transfer compliments of the Apple Store, my network (TimeCapsule) password "is not recognized" on the 2006 MBPro. I'm actually on the 2011 MBPro now, and the password is accepted on the MBAir.

How do I get the 2006 MBPro working again. I am stuck with a computer that I can't even set up.

Carter,
Try deleting the network from System Prefs->Network->AirPort->Advanced->Preferred Network List

Also launch Keychain Access and delete all entries ( password entries ) for that wireless network.
Reboot the machine once now and try logging on.