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MacBook doesnt connect to WLAN any more

G

gerbrian

macrumors member
Original poster
Jun 2, 2014
82
8
Hey guys,
this is my first post here so if I posted in the wrong section I am really sorry :)

Let me explain my problem:

I have a MacBook Pro Retina since december last year and everything worked fine so far until one week ago. After coming home from college and opened the macbook, I noticed that it was not connected to my usual WLAN. After tryring to reconnect manually using the assistant, I always get a "wrong password" error message. I am 100% sure, that the entered password is correct and the network is working perfectly fine on my iPad and iPhone and other connected devices. I havent changed anything in the settings of my wlan network, it just stopped working on my mbp. Anyone has an idea what I am doing wrong?

Thanks in advance for your help!
 
well, you are posting in the "wrong" section as this is the forum for the Macbook Air, not the Macbook pro but what i would do is the following:


(do them one at a time and see if that fixes your issue.)

backup your data.

restart the modem and router (unplug them, let them stay unplugged for a minute or so and plug them back in)

system preferences > network > advanced
find your network, delete it, start over.

If you're still having problem, check to make sure you really are entering the right password:

open finder. shift-command-u. open keychain access. start typing in the name of your wifi network. find it. right click and select copy password to clipboard.
if it's right, delete all of the items associated with your wifi network in keychain access, close the program, turn wifi on and off and then start over.


if none of this works let us know...
you may need to reset the smc but, respectfully, my bet would be a simple error that one of the things i listed will fix :)
 
Thank you for the quick reply! :)
I already tried deleting the WLAN and reentering it. The weird thing is, I just tried to disable the complete authentification process on the router (so that it is not encrypted and I can enter the WLAN without any password) and even then the MBP didnt connect to the WLAN and it just said "connection failed". Ofc I have changed the settings back to WPA2-PSK now, but that seems really strange to me.
 
gerbrian said:
Thank you for the quick reply! :)
I already tried deleting the WLAN and reentering it. The weird thing is, I just tried to disable the complete authentification process on the router (so that it is not encrypted and I can enter the WLAN without any password) and even then the MBP didnt connect to the WLAN and it just said "connection failed". Ofc I have changed the settings back to WPA2-PSK now, but that seems really strange to me.
Click to expand...

what brand router is it?
 
Something might got corrupt in a preferences file.

Test this :

1. Go to : Macintosh HD/Library/Preferences

2. Move to the Trash the "SystemConfiguration" folder.

3. Do not empty the Trash.

4. Reboot.

Try connecting to your network.
 
Hello - would it be possible for you to post some pictures of the errors to elaborate a bit further? I'm struggling to deduce what's most likely to be causing the issues with connection.

Do any other devices have problems connecting? (Phones, etc)
 
DoFoT9 said:
Hello - would it be possible for you to post some pictures of the errors to elaborate a bit further? I'm struggling to deduce what's most likely to be causing the issues with connection.

Do any other devices have problems connecting? (Phones, etc)
Click to expand...

All errors are in german so I think its easier to describe it. When I use the "WLAN symbol" in the navigation bar on top and select my network, I have to enter my password and press connect. After about 10 seconds of waiting a little error message appears at the bottom left of the password prompt popup that "Verbindungsaufbau fehlgeschlagen" which translates into "failed to establish connection.

When I go into settings and use the assistant which should help me connect to the internet, I choose to use WLAN, then I select my network and enter the password and then a little popup appears telling me that my password is wrong.

All other connected devices (iPhone 5, iPad 3, xbox one, apple tv etc. are working perfectly fine, same as my macbook did until 2 weeks ago or so).
 
gerbrian said:
All errors are in german so I think its easier to describe it. When I use the "WLAN symbol" in the navigation bar on top and select my network, I have to enter my password and press connect. After about 10 seconds of waiting a little error message appears at the bottom left of the password prompt popup that "Verbindungsaufbau fehlgeschlagen" which translates into "failed to establish connection.

When I go into settings and use the assistant which should help me connect to the internet, I choose to use WLAN, then I select my network and enter the password and then a little popup appears telling me that my password is wrong.

All other connected devices (iPhone 5, iPad 3, xbox one, apple tv etc. are working perfectly fine, same as my macbook did until 2 weeks ago or so).
Click to expand...

Alright - that helps a little. Are you certain that you've set up the wireless router in the correct manner? Could it be that you've set the 2.4GHz channel to WPA2, however missed the 5GHz and your laptop is trying to connect to the 5GHz with incorrect settings?
 
Bruno09 said:
Something might got corrupt in a preferences file.

Test this :

1. Go to : Macintosh HD/Library/Preferences

2. Move to the Trash the "SystemConfiguration" folder.

3. Do not empty the Trash.

4. Reboot.

Try connecting to your network.
Click to expand...

I tried that and still getting the exact same error :/

----------
DoFoT9 said:
Alright - that helps a little. Are you certain that you've set up the wireless router in the correct manner? Could it be that you've set the 2.4GHz channel to WPA2, however missed the 5GHz and your laptop is trying to connect to the 5GHz with incorrect settings?
Click to expand...


Actually I cannot change that at all in the firmware of the router (its a cheap model). Stuff I can change and selected settings are listed below:

Wireless Channel: Auto Channel
300 Mbps Mode: Bandwith 40Mhz, Extension Channel 1
Broadcast SSID: Allow
SSID: *My WLAN SSID*
Wireless Authentication: WPA2-PSK
Wireless Encryption: AES
WPA-PSK (Pre-Shared-Key): *my wlan password*
Rekey Interval: 60 minutes.

Thats all of my basic settings.

The advanced settings have the following stuff:

Multicast Rate: Auto
DTIM Period: 1

Thats all :/
 
gerbrian said:
Actually I cannot change that at all in the firmware of the router (its a cheap model). Stuff I can change and selected settings are listed below:

Wireless Channel: Auto Channel
300 Mbps Mode: Bandwith 40Mhz, Extension Channel 1
Broadcast SSID: Allow
SSID: *My WLAN SSID*
Wireless Authentication: WPA2-PSK
Wireless Encryption: AES
WPA-PSK (Pre-Shared-Key): *my wlan password*
Rekey Interval: 60 minutes.

Thats all of my basic settings.

The advanced settings have the following stuff:

Multicast Rate: Auto
DTIM Period: 1

Thats all :/
Click to expand...

Please change to 20MHz bandwidth and choose a channel between 8-11.
 
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