Q: Wifi does not connect automatically after sleep
-
Oct 20, 2014 11:46 AMby Allen A,Hello ffmed124,
The steps detailed below can help get your iMac to reconnect to your Wi-Fi network automatically after waking from sleep.
- Check your TCP/IP settings in the Network pane of the System Preferences. Click the "Renew DHCP lease" button
- Choose System Preferences from the Apple menu.
- Choose Network from the View menu.
- Select Wi-Fi, then click the Advanced button in the lower-left hand corner of the screen.
- Click the TCP/IP tab from the top of the screen.
- Click the "Renew DHCP lease" button.
- Select the Wi-Fi tab and view your Preferred Networks list.
- Select each network and click the minus (-) sign to remove those networks from your Preferred Networks list.
- Click OK and close the Network preferences.
- Remove your stored network passwords using the Keychain Access Utility.
- Open Keychain Access from /Applications/Utilities. Your window will look like this:
- Remove your AirPort network passwords from the login keychain: Select the "login" keychain from the Keychain sidebar. Click the "Kind" column to order the list of keychain items by their type. Remove all entries of the kind: "AirPort network password".
- Remove your AirPort network passwords from the System keychain: Select the "System" keychain from the Keychain sidebar. Click the "Kind" column to order the list of keychain items by their type. Remove all entries of the kind: "AirPort network password".
Note: The above steps will remove your Wi-Fi network passwords. If you do not know them, or if your network does not use passwords to restrict access, you should contact your network administrator.
- Open Keychain Access from /Applications/Utilities. Your window will look like this:
- Restart your computer.
- Join your Wi-Fi network. You will need to enter your password for your network again if it requires one.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628Cheers,
Allen
- Check your TCP/IP settings in the Network pane of the System Preferences. Click the "Renew DHCP lease" button
-
Oct 26, 2014 2:24 PMby daimoh,I have the same problem as described by ffmed124, however I tried what you suggested Allen and that made no difference. I removed all the wifi networks, and cleared the passwords. After rejoining the wifi network (it is an airport), then sleeping and re-waking the laptop, it won't connect.
Saying it won't connect though isn't quite accurate, as it seems to connect to the airport without a problem, it just doesn't seem to get the routing information - I can pull up the airport utility and reboot/reconfigure whatever I need to, but I can't connect to the Internet (or anything other than the airport). Incidentally, all of my other computers (iPhones, iPads, older Macbook running Lion, Mac Mini on Mavericks, PVR, etc.) are connected to the same AirPort without issue - only since installing Yosemite have I suffered this problem.
I've reset the SMC and the PRAM also - to no avail. Any other suggestions gratefully received...
-
Oct 26, 2014 3:22 PMby ffmed124,I too have not had any luck in correcting this problem since installing Yosemite on my Mid 2011 iMac. I still have to mouse up to the wifi signal icon in the top upper right hand side of the task bar and manually select the wifi connection I want. As "diamoh" stated, my iPhone and iPad do not seem to experience this problem. It must be a Yosemite issue.
-
Oct 27, 2014 6:04 AMby Allen A,ffmed124,
Thank you for using the Apple Support Community. Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://getsupport.apple.com/GetproductgroupList.action.
All my best,
Allen
-
Nov 2, 2014 1:36 AMby daimoh,I worked out that not only was it my WiFi, but my network connection also - the only way to get them to work after waking from sleep was to reboot. Even worse, if you pulled the network cable out, then plugged it back in, it didn't work.
In the end (with incessant Googling and the fact this obviously isn't a unique problem, I came across http://fieldguide.gizmodo.com/the-worst-bugs-in-os-x-yosemite-and-how-to-fix-the m-1652690924
On that page, among other things, it tells you to clear your network setting files. I tried as per Allen's post above (to no effect), but this worked/fixed it all for me (from http://osxdaily.com/2014/10/25/fix-wi-fi-problems-os-x-yosemite/):
deleting all of:
com.apple.airport.preferences.plist
com.apple.network.identification.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist
from:
/Library/Preferences/SystemConfiguration/
Full instructions at osxdaily as above - do at your own risk, etc., etc.
Good luck!
-
Feb 28, 2016 3:47 AMby Aral,Just a quick update that on El Capitan (10.11.3), I was able to resolve the issue simply by deleting /Library/Preferences/SystemConfiguration/preferences.plist
(What I didn’t test is a simple restart by itself – which might the first thing you might want to try… turn if off and then on again)
