Wifi connection lost after sleep in mountain lion

tried deleting all known networks and wifi services and reconnecting, but there is no improvement.

I was having the same problem after upgrading to mountain lion.
What i did was in Finder went to /Library/Preferences/SystemConfiguration/ and deleted all the networking plists (refer screen shot). Then restarted the Mac and in Network Preferences reconnected to my WLAN.
That solved the problem.

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Wifi connection lost after sleep

Hello guys,
I have a MacBookPro retina 15" and every time my mbp go in sleep mode it lost the wifi connection...
Someone solved this issue?
bye bye,
Oscar

Test after taking each of the following steps. Back up all data before making any changes.
1. Make sure the network is on the preferred list by following these instructions.
2. Follow the instructions in this support article under the heading "Symptom: The network connection drops unexpectedly."
3. Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.
4. Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
5. In some cases, the problem has been resolved by repairing permissions on the startup volume.
6. Reinstall OS X.

Wifi connection stability after upgrading to Mountain Lion on new Macbook Air, help?

I have deleted the network passwords in Keychain and reentered my WPA passwords, which has really help,but something is still not right with my wifi connection. Other devices attach and work just fine, just my new MBA with ML. Ideas? Thanks

I have deleted the network passwords in Keychain and reentered my WPA passwords, which has really help,but something is still not right with my wifi connection. Other devices attach and work just fine, just my new MBA with ML. Ideas? Thanks

Why is wifi connection lost after sleep/wake mode?

I've had this iMac a little over a year and had not experienced this until a few days ago. Every time my computer comes out of sleep mode the wifi is no longer connected. I must turn it off wifi and turn it back on again to re-establish a connection. Any suggestions? Thx!

Hello tim290,
After reviewing your post, it sounds like after the computer wakes from sleep it does not connect to the internet. I would recommend that you read this article, it may be able to help the issue.
Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
Symptom: After restarting or waking from sleep, my computer might not connect to the Internet
After waking from sleep or starting up, your computer may not show that it is connected to a Wi-Fi network.
After start or wake, your computer may indicate that it is connected to a network, but does not connect to the Internet.
Solution
Use these steps if your computer does not automatically connect to your desired Wi-Fi network.
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.
Restart your computer.
Join your Wi-Fi network. You will need to enter your password for your network again if it requires one.
Thanks for using Apple Support Communities.
Have a nice day,
Mario

Connection issues after upgrade to Mountain Lion

Very strange internet connection problem here after upgrade to Mountain Lion.
I just upgraded MacBook (early 2009) to Mountain Lion. After upgrade, I'm having problems connecting to certain websites (ESPN, CNN, etc.), and I can't connect to the computer using LogMeIn.
BUT, I do have an internet connection. Skype works, Messages works, email works, some websites work. I tested using speedtest.net and it shows good download speed, but the upload speed is so slow that it can't even perform the test. A Windows PC on the same network works fine.
Next, I tested the MacBook on another wi-fi network at a coffee house, and everything works fine there!
So it might appear to be something wrong with the router? I have an Cisco (Linksys) E3200 and have upgraded to the latest firmware (1.0.4). But still doesn't work.
The firewall in Mountain Lion is turned off, and I temporarily turned off the firewall on the router and that didn't help, so doesn't appear to be any sort of firewall issue. I've never heard of an operating system being incompatible with a specific router anyway.
Can anyone thing of any setting or something in Mountain Lion that would causing internet connection problems with a specific router?

I don't know if this will 'fix' your problem, but have you tried the 10.8.5 Supplemental Update -> http://support.apple.com/kb/DL1686?
Clinton

Wifi not working after upgrading to mountain lion

As soon as I updated my MacBook Pro from Snow Leapord to Mountain Lion. My wifi doesn't turn ON. It says WIFI "No hardware found".

Yesterday evening I had the same problem. The sound was stuttering a while, and then it was not possible to adjust the volume settings with the keys. Also my computer (laptop MBpro 2009) was slow as ****, when I tried to open the sound preferences.
Even a reboot didn't help, as setting the audio midi settings. The results where terrible.
Just many hours later I was able to solve this problem. I used a program called ICECLEAN.
I checked/Cleaned the preferences files for the SYSTEM and USER.
still no results.
After that I did a full CLEAN USER AND SYSTEM CACHE.
Reboot the machine and then everything worked correctly.
thanks APPLE!

Unable to access connected server after upgrade to Mountain Lion

I upgraded from snow leopard to mountain lion and now am unable to connect to my server.
The error given is "there was a problem connecting to the server"
And in console I get a sharepointbrowser error
There are a few other posts on this but none seem to actually have a fix (for example one recc. was to reboot a bunch of times) I would think deleting/removing the server from the list would work but I don't know how to do that.
I can access the share if I cmd-k and access it manually though so it isn't a SMB issue it seems to be a mountain lion/OS issue.

Hi DWAM_2
Same question to matthew:
1. Are you accessing the KVM through CIMC?
If so, try using a monitor, the CIMC may have been restored to default and has no IP address
Verify(ping) as well that you can reach CIMC and if you do use https://
Also, verify if you connected to the connect ethernet port :)
2. Did you upgrade using HUU(Host Upgrade Utility)
If you didnt, you may have a problem there, both BIOS and ucs firmware needs to be compatible with each other. That is why cisco developed HUU to assist in updating
3. Still does work?
You might need to reset the CMOS, check the manual of your C-series
Typically, you need to short out some pins inside the server or worse case, you might need Cisco's tech support on site
to reload the firmware through hardware

Airport connection lost after sleep mode

Hello everbody,
Each time I send my PowerMac G4 MDD Dual 867 to sleep it won't to connect to my (or rather to any) Airport network anymore after waking up, it just seems as if Airport is completely defunct after waking up.
My iBook G4 works without any problems on the same network, by the way.
I know the workaround with restarting IPv4 networking (described here: http://discussions.apple.com/thread.jspa?messageID=1122310&#1122310) and I have also created an AppleScript for automatising this process, however I am still wondering, if this issue will ever be addressed by Apple, since it is still present for me in 10.4.6.
Best regards,
Björn Wilmsmann
PowerMac G4 MDD Dual 867 with standard Airport card Mac OS X (10.4.6)

Okay, this might not solve your problem, but I had a similar problem when I switched from WPA2 to WEP on my Airport, therefore also changing the password which again somehow got my Powerbook confused.
I went into System Preferences > Network > Airport and looked at my "Preferred Networks" list (Not "By default, join..." > "Automatic"). Then I edited my airport network in that list (the small "Edit" button) and I saw that the password somehow was corrupted. When I corrected this error my Powerbook began joining automatically after sleeping again. Strangely, this setting has nothing to do with the Keychain Access, even though you can find your base station's password there too...
Oh, and I might add: My airport is on a closed network and is therefore not "visible"...
Powerbook G4, 17", 1.5GHz Mac OS X (10.4.6) 2GB RAM

Wireless Internet connectivity lost after sleep

I've got a problem where I keep losing my wireless network connection after going to sleep.
The situation is that I'm connecting to my university's secure network. I have the credentials saved on my MacBook. When I need to go and leave my computer on my desk, I go back to the login window, and close the lid. When I come back and open it again, I'm instantly asked for the network password, at the login screen. Regardless of whether I enter it or dismiss the dialog, I'm unable to get a connection automatically after I resume my user session. There's an exclamation mark on the network icon and it says that there's no internet connection on the menu. When I click on this warning, I'm asked to repair the network connection and re-connect to it. This works, but I'd much rather that this be done automatically. Is there no way for me to resume connectivity after waking up my MacBook without having to manually re-connect?
Thanks in advance for any suggestions.

The problem's still happening in 10.6.2. I lose my Internet connection when I go back to the login window, then close the lid on my MacBook so that it goes to sleep. When I awake it, and log back in, I'm shown as being connected to the network, but not to the Internet. I have to manually re-connect.
When I just close the lid without exiting to the login window, it appears that my Internet connection is re-established automatically, though, on re-awakening. I'm puzzled as to why this is occurring. It looks like a bug to me.

Wireless Connection lost after sleep: iMac 27-inch

When my iMac goes into sleep mode, or logs off after pre-determined time, it loses the wireless connection to the router. I then have to go to the upper right of the screen, select my router from the list of available routers, and force a connection.
Has anybody else experienced the inability to maintain persistent wireless connections?
Thanks!

I had the same problem for weeks with my new 27" iMac. I tried resetting p-ram, adjusting network settings, throwing out preferences for network settings - - - everything! Nothing worked. I final called Apple support and they told me to unplug EVERYTHING from the Mac, including power, wait 30 seconds, and reboot.
Works fine now.
Hope that helps!

Connection lost after sleep mode

When my computer comes out of sleep mode, it's not connecting to the Airport wireless connection. Waiting doesn't seeme to matter...the icon on my iMac (upper right on screen) shows no connection. I have to manually turn off Airport and turn it back on to get it to connect (turning it off and on using the icon).
I have made zero changes to my system, other than that we moved to a new home. No equipment changes...no settings changes. What the heck is going on to cause it to no longer connect when coming out of sleep mode? And more importantly, how do I fix that? Thanks very much!

Try the following, in order, until (hopefully) resolved:
1a. Delete Preferred Network(s)
System Preferences > Network > AirPort > Advanced > AirPort tab
Under "Preferred Networks," delete the network(s) you regularly use from the list.
1b. Delete AirPort Keychain Entries
Launch the "Keychain Access" application located in Applications/Utilties.
Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
1c. Add Preferred Network(s)
System Preferences > Network > AirPort > Advanced > AirPort tab
Add the preferred network(s) using the "+" button.
Restart or log out then back in.
2. Move System Configuration Files
(Note: You will have to reestablish your network connections settings.)
Go to /Library/Preferences
Move the SystemConfiguration folder to the desktop.
Restart your Mac. (Note: OS X will rebuild the files that are now sitting on your desktop. If this doesn't resolve the issue, you can move the folder back to it's original location.)

Bluetooth connection lost after sleep mode

I'm using a bluetooth keyboard with my iPhone. It works great. However, if the phone goes into sleep mode, it does not keep the connection and I have to re-establish the connection through settings each time. Is there a way to keep the connection or have it automaticaly reconnect?

I use the Apple bluetooth. When I sleep my iPad it actually puts the keyboard to sleep. Probably to save the batteries. When I wake the iPad, I still have to go to the Bluetooth and reconnect via the iPad. The keyboard automatically turns back on so I don't have to power it on. I think that is the best you could hope for.

Non retina 15" MBP will not wake up after sleep following mountain lion upgrade

I have an early 2012 15" 2.2 MBP with the 4gb video card. since upgrading to ML a lengthy sleep renders it unresponsive. it will not wake up and will have to be force shut down, then restarted to use. you can here the hard drive spin up after a long sleep (6-8 hours) but only after you hit the power button. even so it's completely unresponsive until restarted.. i noticed apple released an update for retina MBPs for the same issue. unfortunately they have not released the same update for non retina users yet.

Since you had NO problems before ML upgrade:
Not to side with the tech or you, because upgrading OS can be frustrating (it shouldn't).
It appears that you need to do a reinstall (backup first). Its pretty simple to reinstall, just go to boot drive and reinstall. You'll probably have to reinstall print drivers, other than that it's pretty straight forward.
A couple of things I'd do before and after reinstall is to repair the disk (3 times each) while in the boot drive. Then once completed choose the startup disk in system preferences or at least verify it's the startup disk, then repair permissions. If you add apps or printer drivers repair permissions again.
A major problem for lots of folks updating to a new OS is they don't think about disk health....And that's why it's important to insure everything is in mint condition before upgrading to a new OS. The same reason many choose to do a FRESH install of a new OS, by zeroing out the HDD (or SSD) and then repairing the disk and then installing the new OS (you MUST have a solid backup before doing so).
I always have at least 2 solid backups before doing so, but that's me. 100% of the time I do a fresh install of a new OS.
I have a spare computer I use as a test machine for a week or so by upgrading without fresh install. After figuring out all the possible bugs with the test machine I do a clean install of my other computers and once there stable I do a fresh install of the upgraded one.
Not a lecture on how to do things just my procedure which has served me over the years without any problems.
I have photos, videos, documents, and financial records dating back to 1991 so I must be doing something right.

Mail Connections Lost After Sleep - sum up the sollutions?

In https://discussions.apple.com/thread/4268728?tstart=0 9 pages are spend on possible sollutions to this problem.
I had this problem, then it disappeared for quite some time, but now I have it again. I not remember what I did at the time, possible a suggestion from these 9 pages.
- Is there an overview that someone has of all th possible sollutions, I am a bit hesitant in going through all the options.
- it seems, looking at the last page, that there is not one sollution? which ones work best?
Thanks

Try a restart.
Do a backup, using either Time Machine or a cloning program, to ensure files/data can be recovered. Two backups are better than one.
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work. The intent is to see if it is specific to one account or a system wide problem. This account can be deleted later.
Isolating an issue by using another user account
If the problem is still there, try booting into the Safe Mode. Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application uninstaller. For each disable/delete, you will need to restart if you don't do them all at once.
Safe Mode
Safe Mode - About

I have an Mac air 2011 and after install osx mountain lion when I do update to some programs like iMovie and iPhoto and make sleep mode to dowenloaded it doesn't dowenloaded in sleep mode it stop please help me

I have an Mac air 2011 and after install osx mountain lion when I do update to some programs like iMovie and iPhoto and make sleep mode to dowenloaded it doesn't dowenloaded in sleep mode it stop please help me

i guess you could put the aiport utility app on your iphone, click on the aiport express there, it will show you how many devices are connected to it and the mac addresses of those devices.

Wifi connection lost after sleep in mountain lion

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