Mavericks upgrade wifi problem exclamation mark

Just so apple can get a scale of the problem I'll chime in with having the same problem post instillation of Mavericks. Like effinity, I can however, wifi tether with my iPhone 5. Ive tried deleting the two system configuration files which didnt work.

try booting in recovery mode and then repair disk permissions. My new 2013 iMac worked perfectly with wifi until upgrading to Mavericks with the same issue. I tried many things, but repairing permissions in Disk Utility seems to have fixed it for me...

same for me (macbook late 2008):

until upgrading to mavericks - wifi was ok

now - same issue with 5ghz!

repairing permissions or new .plist didn't fix it!

any other ideas?

Here's what finally worked for me -- don't ask me why or how...

1. Boot into Safe Mode (hold down the shift key while the computer boots up)

2. Go into System Preferences --> Network and click on the bottom button "Assist Me"

3. Create a new location. Choose your Wifi network and password.

4. Reboot

After I did this, my wifi was back to normal.

Hi,

I had the same problem after upgrading to Mavericks. Two symptoms: (1) some access points with WPA2 did not accept my password, (2) some public hotspots like Xfinity's network did not want to connect (had the exclamation point symbol). Removing the .plist files as explained before did not solve the problem. Going into Recovery mode and fix permissions also did not help.

I called support and with them on the phone I did:

(1) SMC reset (Shift + Control + Option + Power) and then

(2) Did PRAM reset (Command, Option, P, and R + Power, you will hear two starup chimes)

(3) went into the wireless adaptor, removed all the profiles and removed the adaptor itself from the list (System preferences -> Network, the list on the left where it shows Bluetooth and thunderbolt as well).

(4) Verified that nothing has left behind in the Keychain access (Under "System", category "Password" and there are no "Airport network password" keys on the list).

(5) Restarted my mac

(6) Added the Wifi adaptor (System preferences -> Network, clicking on the "+" sign and add "Wi-Fi")

(7) Tried to login again.

So far I tried to access my access point at home which did not work prior to this cleanup and now it works. I could not verify the other public hotspots yet; I'll do that after I am in an area where those exists but this might help others that suffers from the same problem. Let me know if it works for you guys.

Gil.

You're welcome! Glad to hear it worked for you as well.

See if this works: https://discussions.apple.com/thread/5478413?answerId=23504943022#23504943022&ac_cid=op123456#23504943

Type this into Terminal and paste the output when the issue occurs:

sudo ipconfig getpacket en0

After the upgrade my wifi drops all the time. One minute the page would load and the next second it wouldnt. Will try different fixes when i get home tonight. But for me its a major disappointment so far.

Same laptop, same issue. Free OS update, woohoo. Should have known better.

I no longer can even turn my wifi on. I have a 2008 Aluminium Macbook.

Have you tried this?

https://discussions.apple.com/thread/5470945?answerId=23506666022#23506666022

Here you go

op = BOOTREPLY

htype = 1

flags = 0

hlen = 6

hops = 0

xid = 1936756734

secs = 0

ciaddr = 192.168.1.90

yiaddr = 192.168.1.90

siaddr = 192.168.1.254

giaddr = 0.0.0.0

chaddr = a8:20:66:4e:58:14

sname =

file =

options:

Options count is 8

dhcp_message_type (uint8): ACK 0x5

server_identifier (ip): 192.168.1.254

lease_time (uint32): 0x15180

subnet_mask (ip): 255.255.255.0

router (ip_mult): {192.168.1.254}

domain_name_server (ip_mult): {192.168.1.254}

domain_name (string): home

end (none):