Lose network connection after sleep on iMac but not MacBook

The subject line says it all:
I installed an Airport Express card on my old Rev A iMac when I got my new MacBook and an Airport Extreme Base Station.
The MacBook can go to sleep and, when I "wake" it up, it's ready to go.
After the iMac goes to sleep, its network connection is lost and I have to log back in.
Any way to fix this so the iMac stays logged in?

Haven't received a response but didn't want this hanging out there unresolved. Posted same question to Airport forum in hopes of a response there and marking this "answered."

Similar Messages

My Mac Pro loses network connection after wake from sleep since Yosemite upgrade.

Mac Pro loses network connection after wake from sleep since Yosemite upgrade. Any one have this issue as well. And is there a work around?

Wi-Fi?
Wi-FI connection drops
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wireless Diagnostics
Also try turning off Bluetooth.
Troubleshooting Wi-Fi issues in OS X
Wireless Connection Problems - Fix
Wireless Connection Problems - Fix (2)
Wireless Connection Problems - Fix (3)
Wireless Connection Problems - Fix (4)

FP1600 loses network connection after a few hours

My FP1600 loses its network connection after a few hours. It is part number 185690C-01, with firmware 4.11. I am running FieldPoint Explorer version 3.0.1 and LabView 6.1 from Windows XP Professional. I set it up, and everything runs fine for 4 hours or more. I do not have the network watchdog enabled, and the FP1600 is in constant communication with the host computer in any case. Sometime in the middle of the night the communication is lost. The FP1600 link light
is on, and it is still receiving packets, but it will not respond to a ping or any other communications. Only a power cycle brings it back. The FP1600 is sitting right next to the host computer, both attached to the same network switch. There is no interruptio
n of network services to the two.

Hi Heinz,
We are also trying to troubleshoot this same problem (Intermitten network connection loss with FP1600 Ethernet Module - Error code "33163", Error Message - "FP1600 Connection to module has been lost."). We have checked other possible causes for this sort of behaviour. Including independent assessment of netowork availability at the time of error reporting, connecting dedicated power supply to the FP1600 module, temperature of cabinet housing the module (which is between 10 and 50 deg C), disconnecting sensors connected to various I/O modules connected to this module, increasing duration of parameter "time out" (the time module will wait before reporting an error if it can not access network). However, none of the above resolved the intermittent and random network loss errors.
The MAX version is 3.0.2, and the firmware on the module is 4.17, Labview version is 7.0 and the Operating System is windows NT.
I was wondering is there any information about this problem from any user or NI recently. The only solution looking in to this discussion forum seems to be replacing the module.
MehulMessage Edited by MPatel on 02-28-2005 08:16 PM

I lose network connection after MacBook Wakes from Sleep

I upgraded to Mountain Lion on my 27" iMac and 15" MacBook Pro. iMac is doing fine. MacBook Pro, however, when it wakes from sleep, seems to have the network untility crash.
So the computer wakes from sleep, and the little status bar radar thing does its little sweep and doesn't just go solid. . If I click on it, it shows my Airport as connected, but after clicking, it freezes. the second to the bottom bar goes solid and the cursor becomes a spinning beachball. If I open system preferences, and select network, it freezes. The only way I can seem to get back on line is to reboot. I have an airport extreme with an older (g) airport express that I use to beam music to my stereo. The MacBook Pro is about 2009 vintage—you can still get to the battery, HD and memory—and the iMac is a bit later. One of the first 27" models, not quad core.
Anyone else having this problem? What more info would you need to help resolve? I'm a novelist and this is killing my productivity.
Thanks,
Steve
http://stephenstark.me

Try the basics first:
Change your router channel number. Most times this works & is all you have to do.
Disconnect & reconnect your modem. unplug it for about 10 seconds. Plug it back in. Do the same for Apple’s routers. Wait for everything to reboot.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer. See these basic networking KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
What to do when you can't connect to the Internet
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

T440s in Windows 7 Pro loses Wifi connection after sleep 7260AC

Hi guys,
I keep having issues waking up from sleep with my T440s. It WILL NOT connect to wifi and the wireless adapter under windows adapter settings disappears. Only thing that fixes this is a reboot. I have removed "allow windows to turn this device off" under wireless settings.
Driver: 17.12.0.4
Dated: 28/08/2014
Software: Lenovo Access Connections
I do not use windows to connect to WIFI. I have dedicated profiles for each of my wifi networks at home and work.
This is a serious productivity killer.
Any help would be appreciated.
Thanks!
Solved!
Go to Solution.

This is a well-known issue with the AC card. Go take a look at the Intel forum.
You don't necessarily have to reboot to get the card back. Right click it in Device Manager and then disable/enable. It will come back online.
Some tips that have worked for many:
-DO enable the power saving setting. If I disable it on my T440p, the card is offline upon wakeup.
-Ditch ProSet and let Windows manage your wifi. Profiles might be convenient, but...
-Ad Hoc QoS - WMM enabled. Enable it on your router(s), too.
-Ht Mode - VHT
-U-APSD support - this one can go either way. Some leave it on and don't have an issue. Some have to disable it to have the card work after sleep. You have to play with it.
And, I really believe that the router/modem type can make a difference, too. Some just don't work right with this card no matter what you tweak on the card. With this card, I think an AC router/modem is the way to go.
Another thing is the driver itself. I had wake issues when I first got this ThinkPad about 10 months ago. Then, Intel released v 16.6 and that one fixed it. I've tried all of the 17s released since and all of them caused sporadic failures to wake. So, I have always rolled back to 16.6 and it always wakes.
Note this: If you use Lenovo Update, it won't create a restore point in Windows so your "Roll Back Driver" button might be greyed out in DM. Always manually create a restore point before you update a driver. And, if it's working, whatever it is, leave it alone. If the release notes don't address an issue you're having, skip it.
Driver updating is way oversold here and elsewhere. If you're determined to update anyway, at least don't be an early adopter. Let other peeps do it first and then come back here and see about the complaints! Also, you can download the driver at Intel in their Administrators sets of drivers. Bare drivers and no software overhead.
Good luck.

Mac Loses Network Connection while Sleeping (Wake for Network Access ENABLED)

I have "Wake for Ethernet network access" enabled in my Energy Saver preferences. However, it appears that my Mac disconnects from the network entirely when it sleeps; therefore, this does not work when I am trying to connect while it's asleep.
I suspect this because it always takes a moment to connect to the network when I wake it up. Webpages don't load until about 30 seconds after the computer wakes up. I can't connect to my Mac over the Internet (with my port forwarding enabled) anymore, which is a big problem.

The article isn't very clear, but I've seen from a Google search "wake on LAN on Mac" that people think that the setting in Energy Saver enables simple wake on LAN as well. Maybe it does both. Wake on Demand has the advantages of advertising the sleeping Mac's services via Bonjour and responding to pings without waking up the sleeping Mac.
To be honest, I hardly know how Bonjour works, just that it's used to discover Apple devices on a network and that it gives each Mac an alternate hostname that you can use (for example, Bobs-Mac-Pro).. It seems like the Bonjour Sleep Proxy would only work if you're connecting via Bonjour to the Mac. If you connect directly by the IP address (192.168.1.12 for example), the router must send that straight to that Mac and not through a Bonjour Sleep Proxy (because how would it know to look for a BSP?). I tried connecting by address to my Mac from a computer on LAN while my Mac was asleep, and it woke up. It used to do that over the Internet, but now it doesn't, which is my problem. I was going to take it a step further and cut out any Bonjour Sleep Proxies totally by connecting the computers directly with ethernet, but that caused my Mac to refuse to sleep at all.

Cisco Anytime Connect VPN working from iMac but not from MacBook Air with same settings and wifi network

Hi guys,
I'm having trouble connecting my new MacBook Air to Cisco Anytime Connect VPN.
The same configuration works with my iMac, in the same network and same Mac OS Mountain Lion on both computers.
After successfully connecting to VPN after a few seconds it gets disconnected and, what is worse, WIFI is not working any more in my macBook Air, I need to deactivate it and start again.
With iMac with the same settings it doesn't happen.
Any ideas?
Thanks!

Did you power cycle the network? That's always the first thing you want to do if a device is "missing" or not connecting to your network correctly.
If you have not already tried this a few times, power down the entire network...all devices, order is not important.
Wait a few minutes and place the MBAir close to the TC
Start the modem first and let it run a few moments by itself. Then start the TC if it is the device connected to the modem and let it run a few moments. Then start each device one at a time the same way.

Loose network connection after sleep

Everytime my macbook pro sleeps it looses network connections in my home and I have to go through re-establishing connection including network password

This seems to be a common issue on most Mac platforms lately. I have 2 Macbook Pro's and 1 Air all experiencing this issue. It only happens on hidden networks, at least in my case and most I have read. I have yet to hear any official response from Apple but there must be at least 15 threads on this exact topic thoughout the forums.
Some people claim removing all the "Remembered" networks and re-add them fixes it. I have noticed the only thing that seems to work is if I remove all networks and if I have a hidden network, it can be the only one listed. As soon as I add another saved network hidden or not, the problem comes back.
This is hard since most of the end users that use the macbooks on our hidden networks also use them at home. So they naturally have multiple networks listed. The odd thing is its not ALL of them. We have a bunch of other Mac's that do not experience this issue.
I know this is not a solution but it is what I have found so far...

"Network connection timed out" for albums but not singles? huh?

When I try to buy an album (15 songs for $10.99) I get the error mssg "network timed out." All my connections are working fine. But when I try to buy any individual single (at $1.29 each) it goes through. Is this a ploy to get me to spend $19 instead of $11 for the same material? How can I buy the whole album?

ps. I have store credit with iTunes!

Slow connection speed imac but not macbook

Slow connection speed on my imac 2.4ghz intel core 2 duo running 10.6.8, I get download of 15mbs and upload of 9mbs but on my macbook pro 2.8ghz intel core i7 on the same desk I am getting 33mbs and 10mbs!
Can anyone help me out on this, thanks in advance.

The two key numbers here are: 1) Transmit Rate: 59 which is the current maximum bandwidth of the wireless connection in Mbps, and 2) The MCS Index: 6 which indicates that the iMac's connection to the BT Home Hub wireless is only using a single spatial steam. Forget the techo mumbo jumbo, your iMac is much more capable than that.
You should expect a Transmit rate closer to 130 Mbps on the 2.4 GHz radio. At least this explains the poorer performance of the iMac. I would venture to say that if you temporarily connected the iMac to the BT using an Ethernet connection the iMac would equal or exceed the MacBook Pro's bandwidth performance.
Has this always been an issue or something that has just recently started happening?

Signal strength from Airport Express dropping to imac (but not Macbook)

I have an Airport Extreme to control my home wireless network. My Macbook Pro works all over the house with no reception/signal strength problems. But my imac, which is situated about 15/18metres away is dropping signal all the time. Any ideas or advice please?
Cheers
Simon

The antenna opening for the iMac is on the back of the screen, so make sure that the iMac is not pushed back into a cabinet or even a corner of the room. Sometimes a small change in location will make a big difference in reception.
Also check to make sure that you do not have other electronics near the iMac like a cordless phone, ampliifer, satellite receiver, TV, etc.
If the iMac is near a window, it may be picking up wireless interference from another network in the neighborhood near you. Try to move the iMac away from the window to a different location.
Power off the iMac and restart after any change in location so that it will establish a new connection.
If you try everthing and the results seem to be the same, then you might want to think about taking the iMac to an Apple store in your area to let them have a look and check out the wireless card in the device.

PDFs and Word Files open on iMac but not Macbook Pro

I own an iMac and a MacBook Pro. Recently, I've been having an issue with some PDFs and Word files that have been emailed to me from different contacts. All open—and can be seen using Quick Look—on the iMac. However, on the MacBook Pro it's a different story. When I try Quick Look all I see are the icons. When I try to open the PDFs in Preview (default app for me) I get an error message saying the file could not be opened and might be damaged. When I try to open the Word doc in Word, Pages or Bean I see all of the extraneous header information etc and the text is all mixed up in that formatting junk. I have repaired permissions, cleared out my user cache, restarted—pretty much everything I can think of. But no luck. Thought?

Brilliant suggestion! I checked all the display settings on my iMac 27" and confirmed they were the same settings as my MacBook -- until I checked the Window 7 screen resolution. Because of its size, I had expanded the screen across most of the monitor. When I changed the resolution to one suggested or configured by Windows, Approach worked fine. I've now tested it on quite a few of the settings, and as long as I let Windows determine the best resolution (on my iMac 27" it seems to be 2043 x 1276), Approach works like it should. Thank you!

CSCur62528 - ISE loses network connectivity after upgrade to 1.3

still not working with the new version ....
appliance network cards still get messed up during upgrade process .

For clarity, are you saying that you used ise-upgradebundle-1.2.x-to-1.3.0.876.repackaged.x86_64.tar.gz to upgrade and your NICs still swapped?
If this is the case and your ISE is Live, then a call to TAC is in order.
Please Rate Helpful posts and mark this question as answered if, in fact, this does answer your question. Otherwise, feel free to post follow-up questions.
Charles Moreton

Problem running Windows software on iMac but not MacBook Pro

I just got an iMac 27" to replace my old iMac 24". I also have a MacBook Pro.
I am using the same version of Parallels 7 and Windows 7 on both my iMac 27 and my MacBook to run Lotus Approach 9.8 (part of a SmartSuite package).
Lotus Approach works fine on my MacBook (as it did on my old iMac 24), but when I open database files on my iMac 27, the database screen starts flashing (rewriting the screen in some endless loop) and the program becomes inoperable.
I've uninstalled and reinstalled Parallels 7, Windows 7 and the Lotus software on my iMac 27, but that did not resolve the problem.
I need to use the Lotus Approach software on my iMac 27 -- so I can convert the Approach databases to FileMaker.
Any ideas about what the problem might be on the iMac 27 or what I can to to fix this problem? Is this a hardware problem, a driver problem, or something else?

Brilliant suggestion! I checked all the display settings on my iMac 27" and confirmed they were the same settings as my MacBook -- until I checked the Window 7 screen resolution. Because of its size, I had expanded the screen across most of the monitor. When I changed the resolution to one suggested or configured by Windows, Approach worked fine. I've now tested it on quite a few of the settings, and as long as I let Windows determine the best resolution (on my iMac 27" it seems to be 2043 x 1276), Approach works like it should. Thank you!

Apple TV loses WiFi Connectively After waking up from sleep

My Apple TV, software version 3.0.2 (which gives us 1080P btw), works fine, until I put it to "sleep." Later, when I use the Apple TV, it says: "Not connected to the Internet." In effect, my wifi has disappeared from the memory of the Apple TV, and I have to enter the wifi network's password again on the Apple TV.
I have had this Apple TV for about a year; the problem appeared maybe one month ago.
I took it to the Apple Store after Apple Care Telephone Support consulted with engineers. The Apple engineers said it could be a hardware problem, and for me to bring my Apple TV to the Apple Store so they could diagnose it. But at the Genius bar, they put it to sleep and woke it up and it never lost connectivity every time. I suggested that as the Apple Engineers wanted the hardware looked at, why doesn't the Apple Store keep my unit, put it to sleep, and wake it the next business day? The genius bar refused, as the problem did not replicate itself at the genius bar. I told them that trying after 10 minutes wasn't enough. They should try it overnight, as I do (go to bed, try it the next day, only to discover that the Apple TV lost it's connection to the WiFi.
So for now, my work-a-round is that after a few hours, I have to reenter the password for the wifi. I've been reading threads about similar issues with the iPad, but I don't know if the problems are related (technology wise).
Bottom line: My Apple TV loses its connectivity after being in sleep mode for awhile. Nothing to do with the iTunes store or 3.0.2 as far as I can determine; if I don't put it to sleep I don't lose connectivity.

Thank you, Jamie Cox1. However, after rebooting the Apple TV, I lose my 1080P; it goes to 720P and takes about 5 minutes or so to reboot. Then I have to set the 1080P again. The good news is that the wifi returns But it is quicker merely to re-enter my password.
The problem remains: After a while of having the Apple TV in sleep mode, I lose connectivity to my wifi And while I have a complicated password (upper and lower case letters, numbers, and not a dictionary word), it still is quicker to re-enter my password than to wait for the Apple TV to reboot and re-enter the settings for 1080P.
Thanks anyway; if I only had 720P perhaps this solution might be enough - but I have 1080P.
I am working with Apple Care; I have reconfigured my wifi twice with Airport Utility, removed all interference (microwaves, cordless phones), and still the problem remains. Apple Care hasn't solved the problem. The Genius Bar at the Apple Store hasn't solved the problem. Re-booting does find the wifi again, but it takes a long time, and then I still have to re-set the resolution to 1080P. So I just re-enter my password each time.
And that's my update! I appreciate everyone's suggestions. However, the problem remains: after putting the Apple TV in sleep mode, and then later when I want to use the Apple TV, the Apple TV forgets that it is connected to wifi and I have to re-enter my password, or I can take some time and reboot the Apple TV but then while the wifi returns, the 1080P disappears.
Thank you everyone for all your suggestions
But the problem remains

Lose network connection after sleep on iMac but not MacBook

Similar Messages

Maybe you are looking for