Ethernet disconnects when imac sleeps

When i put my imac to sleep, it seems to disconnect from the ethernet that is plugged into the back.
When i wake it up and log it back in, any applications that was signed in, like lync messenger are logged out and it takes a good 10 seconds to be able to browse the internet.
I'd love to just put my display to sleep and not the computer itself, however I work in an office and need to be able to lock my machine when i walk away.
I use CMD ALT EJECT to put my imac to sleep. And i am using the latest OS.
Please help

Try the following suggestions:
http://support.apple.com/kb/HT3964 Intel-based Macs: Resetting the System Management Controller (SMC)
Require a password after waking your Mac
How to lock your screen in OS X
=============
And i am using the latest OS.
Which is Yosemite. According to your profile you show--> OS X Mavericks (10.9.1)
Conflicting info: Please update/correct your profile so that you can receive the correct troubleshooting suggestions. This will assist the users in trying to help you. Thank you.

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PPPoE Still Disconnects When Computer Sleeps

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Time Machine backup disappears when iMac sleeps

Tried finding this topic but could not find the specifics. I have an Intel iMac running 10.6.7 and I use a Mercury enclosure with a Seagate Barracuda 2TB SATA for Time Machine backup, connected with FireWire. Every time my Mac goes to sleep overnight, the next morning, the Time Machine icon disappears from the desktop. It's been disconnected, because when I run Check Time Machine, the log reads thusly:
<<Thu Apr 21 10:29:30 com.apple.backupd-auto Not starting scheduled Time Machine backup - time machine destination not resolvable.
Thu Apr 21 12:30:05 [0x0-0x2d22d2].backupd-helper Not starting Time Machine backup after wake - failed to resolve alias to backup volume
>>
Occasionally I'll get the error message on the Mac that a device has been "improperly disconnected" but most of the time when it sleeps the TM drive icon just goes away (even tho the backup drive is still on).
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Best,
Mike

I had the same problem as Bru-Hed, but with a Samsung G3 Station 1 TB with USB-connection. After waking up the MAC the message "improperly disconnected" appeared. Was happy with the solution you gave and changed the power save settings accordingly, the drive holds its power, but....... things did not change. Switching off the MAC and restarting gives no problems with the back-up drive, but after waking up I have to reinstall the back-up drive every time by disconnecting and connecting the USB-connector. After choosing the drive again in Time Machine, everything works properly until the next time the MAC goes asleep......
Any other solution to this problem ?

Network disconnect when in sleep mode

Hi all.
Since I've installed Mountain Lion, any time the computer goes into sleep mode, networking do the same: I cannot download files, when the computer wakeup I have to wait the reconnection before being able to use mail, safari or ather network stuff.
I did not find any option to set, telling the computer waht to do when in sleep mode.
WIth Lion and preceding OsX this was not an issue.
Is there anything I can do?
Thanks.
Federico.

Hi,
Yes, clear "Allow the computer to turn off this device to save power" in the properties of network adapter\Power management as mentioned in the link provided by arnavsharma, and check if the issue persists.
Yolanda Zhu
TechNet Community Support

AEBS and AExpress N ethernet bridge disconnects when I sleep MBP??

Hi all this is my first post but im a long time mac user having grown up in a mac house.
anyways im an it guy by profession and ive been working at this issue to no avail so I figured I might come on there and see if any of you have experienced this issue
the issue I get is that when I close/sleep my MBP it disconnects the Airport Express ethernet bridge clients
NETWORK Info
I run a small business from my home thus I have FiOS (yay 20/20) with a block of 13 static ips that i distribute via DHCP and MAC reservation to allow remote access to my network as well as keep things consistent.
I currently run cat6 from my FiOS ONT to my Airport Extreme Base Station, which i use on a strict N only in 5ghz range as my area is flooded with b/g networks but no n networks (yay again).
I recently acquired an N Airport Express to provide a wireless to ethernet bridge thus extending my network to my entertainment center (ps3 xbox etc)
(extra info: im using n here because i found that b/g limits my internet connection speeds to 7-9 mbps where as my connection is capable of 20. On my n speed network I can get my full bandwidth wirelessly, yes I know there is obviously some bandwidth and throughput loss by going wireless but not as much as a b/g network was giving me)
NETWORK SETTINGS
On my n network I distribute a range of IP addresses from my static block. I have tried a few different dhcp lease times which definitely improved my initial problem which seemed that it would log me out when the key rotated every 20 min. Currently ive bumped that up to 1 day (i know not as secure id like to set it back to 20min but it seems that when it rotates that it logs me out) and haven't had that specific issue revolving around key rotation again. ive tried the WDS, Extend a network and join a network options with no real difference in behavior when I shut my laptop and for example my GF is playing rock-band online she gets disconnected also worth noting that it seems there is an intermittent DNS issue on the express ie cant find time server even though at that time ethernet clients are able to connect and get dns response
Below is my log from my express base station when the disconnect occurs
Feb 05 06:23:29 Severity:5 Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
Feb 05 07:23:29 Severity:5 Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
Feb 05 08:23:29 Severity:5 Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
Feb 05 09:23:30 Severity:5 Clock synchronized to network time server time.apple.com (adjusted -1 seconds).
Feb 05 09:28:36 Severity:5 Joined BSS 00:1e:52:78:bc:48
Feb 05 09:28:36 Severity:5 Installed unicast CCMP key for authenticator ******:bc:48
Feb 05 10:24:05 Severity:3 No Address for NTP server time.apple.com.
Feb 05 11:24:35 Severity:3 No Address for NTP server time.apple.com.
Feb 05 12:25:05 Severity:3 No Address for NTP server time.apple.com.
Feb 05 13:25:35 Severity:3 No Address for NTP server time.apple.com.
Feb 05 14:26:05 Severity:3 No Address for NTP server time.apple.com.
Feb 05 15:26:35 Severity:3 No Address for NTP server time.apple.com.
Feb 05 15:44:34 Severity:5 Disconnected from network.
Feb 05 15:44:42 Severity:5 Joined BSS **********bc:48
Feb 05 15:44:42 Severity:5 Installed unicast CCMP key for authenticator ********bc:48
Feb 05 15:53:26 Severity:5 Connection accepted from [************:6baf%bridge0]:51073.
Feb 05 15:53:28 Severity:5 Connection accepted from [************:6baf%bridge0]:51075.
Feb 05 15:53:28 Severity:5 Connection accepted from [************6baf%bridge0]:51076.
Feb 05 16:09:13 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted +0 seconds).
and my log from my AEBS
Feb 05 09:09:08 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted +0 seconds).
Feb 05 09:28:37 Severity:5 Associated with station ******:91:07
Feb 05 09:28:37 Severity:5 Installed unicast CCMP key for supplicant **********:91:07
Feb 05 10:09:09 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted +0 seconds).
Feb 05 11:09:10 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted -1 seconds).
Feb 05 12:09:10 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted +0 seconds).
Feb 05 13:09:11 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted -1 seconds).
Feb 05 14:09:11 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted +0 seconds).
Feb 05 14:15:28 Severity:5 Associated with station ******:6b:af
Feb 05 14:15:28 Severity:5 Installed unicast CCMP key for supplicant ******6b:af
Feb 05 15:09:13 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted -2 seconds).
Feb 05 15:44:32 Severity:5 Disassociated with station ******6b:af
Feb 05 15:44:35 Severity:5 Rotated CCMP group key.
Feb 05 15:44:35 Severity:5 Deauthenticating with station ******cc:e5 (reserved 2).
Feb 05 15:44:35 Severity:5 Disassociated with station ******:cc:e5
Feb 05 15:44:35 Severity:5 Disassociated with station ******91:07
Feb 05 15:44:36 Severity:5 Rotated CCMP group key.
Feb 05 15:44:43 Severity:5 Associated with station ******:cc:e5
Feb 05 15:44:43 Severity:5 Installed unicast CCMP key for supplicant ******cc:e5
Feb 05 15:44:44 Severity:5 Associated with station ******91:07
Feb 05 15:44:44 Severity:5 Installed unicast CCMP key for supplicant ******91:07
Feb 05 15:53:01 Severity:5 Associated with station ******6b:af
Feb 05 15:53:01 Severity:5 Installed unicast CCMP key for supplicant ******:6b:af
Feb 05 15:53:15 Severity:5 Connection accepted from [******:6baf%bridge0]:51048.
Feb 05 15:53:16 Severity:5 Connection accepted from [******6baf%bridge0]:51049.
Feb 05 15:53:16 Severity:5 Connection accepted from [******:6baf%bridge0]:51050.
Feb 05 16:09:13 Severity:5 Clock synchronized to network time server time.nist.gov (adjusted +0 seconds).
THANKS FOR YOUR INPUT AND SUGGESTIONS

i decided to also add my log from the mbp (dont think it matters but its an early 2008 model mbp)
as you can see i put my computer to sleep at the exact same time that the airport express lost connection iI
2/5/09 3:44:31 PM kernel hibernate image path: /var/vm/sleepimage
2/5/09 3:44:31 PM kernel sizeof(IOHibernateImageHeader) == 512
2/5/09 3:44:31 PM kernel Opened file /var/vm/sleepimage, size 4294967296, partition base 0xc805000, maxio 400000
2/5/09 3:44:31 PM kernel hibernate image major 14, minor 2, blocksize 512, pollers 4
2/5/09 3:44:31 PM kernel hibernateallocpages flags 00000000, gobbling 0 pages
2/5/09 3:44:32 PM kernel /drv/ MacModule.cpp:261 powerStateWillChangeTo: flags=4 stateNumber=2
2/5/09 3:44:32 PM configd[36] AppleTalk shutdown
2/5/09 3:52:59 PM kernel /drv/ MacModule.cpp:266 powerStateWillChangeTo: found flag=kIOPMSleepCapability (4)
2/5/09 3:44:32 PM configd[36] AppleTalk shutdown complete
2/5/09 3:52:59 PM kernel AirPort: Link Down on en1
2/5/09 3:52:59 PM aosnotifyd[278] Stream:streamCallback - an error occurred on CFReadStream: Operation could not be completed. Socket is not connected
2/5/09 3:52:59 PM kernel /drv/ MacModule.cpp:261 powerStateDidChangeTo: flags=4 stateNumber=2
2/5/09 3:52:59 PM kernel /drv/ MacModule.cpp:266 powerStateDidChangeTo: found flag=kIOPMSleepCapability (4)
2/5/09 3:52:58 PM configd[36] setting hostname to "Comp.local"
2/5/09 3:44:34 PM kernel System SafeSleep
2/5/09 3:52:59 PM kernel hibernatepage_listsetall start
2/5/09 3:52:59 PM kernel hibernatepage_listsetall time: 180 ms
2/5/09 3:52:59 PM kernel pages 635428, wire 220619, act 232958, inact 31, zf 59, throt 1114, could discard act 55989 inact 111080 purgeable 13578
2/5/09 3:52:59 PM kernel hibernatepage_listsetall found pageCount 454781
2/5/09 3:52:59 PM kernel IOHibernatePollerOpen, mlget_interruptsenabled 0
2/5/09 3:52:59 PM kernel IOHibernatePollerOpen(0)
2/5/09 3:52:59 PM kernel writing 454552 pages
2/5/09 3:52:59 PM kernel image1Size 636423168
2/5/09 3:52:59 PM kernel all time: 21548 ms, comp time: 2872 ms, deco time: 0 ms,
2/5/09 3:52:59 PM kernel image 1120299008, uncompressed 1861844992 (454552), compressed 1116586684 (59%), sum1 5d386928, sum2 eeca85bd
2/5/09 3:52:59 PM kernel hibernatewriteimage done(0)
2/5/09 3:52:59 PM kernel sleep
2/5/09 3:52:59 PM kernel Wake reason = EC LID0
2/5/09 3:52:59 PM kernel System Wake

When iMac Sleeps, AirPort Disconnects: Why?

I took delivery of my iMac yesterday (my first Mac), and my problem is this:
After awakening the iMac from sleep, the wireless Internet connection is lost and I have to go through the few clicks to select the wireless network, etc. It's then reconnected fine.
Shouldn't the wireless Internet connection be maintained through sleeping?

Make sure that there is only one choice for your Mac. Old networks that you setup and old preferred network passwords can confuse your Mac, especially if you migrated old user accounts when you originally setup this Mac.
The old networks can be found in System Preferences>Network>Air Port. Press the Advanced button. In the AirPort pane you will have to highlight each network listed and remove it by clicking the "-" button below.
Old preferred network passwords are in your Keychain. Go to Apps/Utilities/Keychain Access. If you sort the passwords by kind they should be labeled such as Airport Network Password.
When you designate a wireless network as preferred, the password is saved to the keychain. So if you make sure that your iMac only has only one preferred network from which to select, upon startup or waking, it should ignore all the other wifi networks drifting around your location and make a beeline to its one preferred choice.
I hope something here applies and is helpful.

Wifi gets disconnected when iMac is restored after sleep mode.

Everytime my imac is restored from sleep mode I have to reconfigure my wifi settings, starting to become a pain.

HACKINT0SH wrote:
It's a known issue, engineering is working on it.
Do you know this as fact? For engineering to be working on it, they would have to admit they had a problem.
In the meantime, I would simply disable sleep mode. It's not like an iMac really needs it.
Also questionable. I've seen the electrolytics on the logic board "pop their tops" on an iMac that had sleep mode disabled.

Iphone disabling router when imac sleeps...

I have my iMac behind an SMC Barricade SMC7008ABR router. I recently upgraded the router firmware which I suspect is the reason why I've started seeing this problem on a network that's been stable for years.
When I put my iMac into either software or hardware sleep, and only if I have my iPhone connected to the usb-docking cradle, within 1-3 seconds, the router suddenly resets itself and then proceeds to berserk itself. All the nodes on the network come down, and the light show begins on the front panel.
Power-cycling the router does not work. Nor will the router reset itself until such time that I remove the iMac from it's slumber.
Unplugging the iPhone (gen 1) from the cradle and sleeping the box does not affect network operations.
I can duplicate this every time.
The router is my DHCP server as well. I can provide more data if requested. Have searched the forums and google'd the problem but couldn't locate any helpful information.
TIA

progress: I unchecked the power-options box: wake for ethernet admin access, and that seems to have solved the issue.

Losing connection to 2nd monitor when iMac sleeps

I have a 2nd monitor connected to my 21" iMac (late 2013) with Mavericks via displayport/thunderbolt port to HDMI. I had the same one with the same link connected to my old 2010 Macbook Pro, and I never saw this.
What happens is when the computer goes to sleep, all of the windows on the second screen move to the iMac, and my Wacom tablet even goes from being mapped to ONLY my second monitor to being only mapped to the iMac!
This is kind of driving me crazy, and I have searched and Googled and just can't find a solution.
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Try a reset > Mac OS X: How to reset the printing system

Disconnecting when computer sleeps- will not reconnect

My grandfathers MacBook disconnects from wireless network whenever the computer goes to sleep/is temporarily shut. When it is opened back up, says it is not connected to the internet even though the Network is reading as working. Mail will not send either. The only way I can get it back in gear is running the Network diagnostics or simply restarting the computer.
Please Help.
OH- "Disconnect from wireless network when logged out" is NOT checked in system preferences

Hello candace171. Welcome to the Apple Discussions!
If he's using Preferred Networks, try the following ...
1. Delete Preferred Network(s)
o System Preferences > Network > AirPort > Configure
o In the "By default, join:" pull-down menu, select "Preferred networks"
o Delete the network(s) you regularly use from the list
2. Delete AirPort Keychain Entries
o Launch the "Keychain Access" application located in Applications/Utilties.
o Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
o Restart, or log out then back in.
3. Add Preferred Network(s)
o System Preferences > Network > AirPort > Configure
o In the "By default, join:" pull-down menu, select "Preferred networks"
o Add the preferred network(s) using the "+" button.
o Restart or log out then back in.

Wireless Quits When iMac Sleeps

Can someone help me out with the following annoyance?
Every single time that my iMac wakes from the sleep mode, I lose my internet connection.
I'm automatically presented with the Network Diagnostics window when this happens and as soon as I select my Network name from the list, the connection is immediately restored.
But why is the connection lost every time the iMac shuts down?
Cheers
John

I think that I may have found the answer, at least in my situation. If I understand correctly, every time the Mac goes to sleep, it turns off the WiFi card. The key to ensuring that the connection is renewed again when the Mac powers on again, is to make sure that the - Ask To Join New Networks - box is checked
in my case, just as the Screen Shot shows, it wasn't. I have of course checked it now and hopefully that will be the end of my problems with the WiFi constantly conking out.
Cheers
John

After Mavericks Update Arris Modem now going to standby mode when iMac sleeps

After installing Mavericks on iMac, whenever the iMac (connected wirelessly to the network with Airport Extreme 5th Gen) goes to sleep it is causing our modem to enter standby mode which limits internet access to all devices on the wireless network even when they are actively requesting data from the internet. As soon as the iMac is woken up the modem comes back out of sleep/standby mode and everything works fine. The modem is connected directly to the Airport Extreme WAN port and all devices just use wireless internet. The only resolution I've found is stopping the iMac from entering sleep mode in Energy Settings but this is not a long term solution. Anyone else having this issue?
The modem we have is an Arris TM722G.
Thanks in advance.
I've also tried resetting PRAM, creating a new network location, releasing and renewing IP.

If you can get the computer to start in Recovery, then access OS X Utilities,
an attempt could be made to Repair Disk using the Disk Utility there...
Several instances of an upgrade leading to issues in Mac OS X was due
to some previous condition in the computer, or problem in the hard drive,
or maybe insufficient or low-quality RAM installed; among others, before
the last OS X upgrade was installed. And then the extra effort of processing
a new OS on top of other bits, can cause the computer to act up or fail.
What was the previous OS X version? How old is the iMac...?
Did you upgrade from Snow Leopard 10.6.8 to Mavericks 10.9.2?
•Apple - OS X Recovery restores your Mac
http://www.apple.com/osx/recovery/
•OS X: About OS X Recovery
http://support.apple.com/kb/ht4718
•OS X: About Recovery Disk Assistant
http://support.apple.com/kb/ht4848
•OS X System Recovery: Explored & Explained - Tuts+ Mac computer skills tutorial
http://computers.tutsplus.com/tutorials/os-x-system-recovery-explored-and-explai ned--mac-60375
There may be a hardware problem behind the issues your computer
presents, and a diagnostic inspection &/or testing may need to be
done at a Genius bar, at an Apple Store; this is cited as a free service
at US and Canada Apple Stores. If you do not have one, you could
enlist the aid of an independent authorized Apple service company
who has trained technicians on staff; these are often also resellers.
Good luck & happy computing!

Firewire drive does not sleep when iMac sleeps

My G-Tech G-Drive Mini connected via Firewire to an new iMac will not spin down when the iMac goes to sleep. It does spin down with the iMac active, but will spin up when the iMac goes to sleep. On a MacBookPro with Tiger, the drive will spin down when the Mac sleeps, which I would expect to be the "normal" behavior for an external drive. Is this a Drive issue or an iMac Firewire bus issue?

By the way Bosanac...
Welcome to the Apple Discussions!
It seems as though I had a similar issue with my ministack external drive and I stopped using it and I have used several different external drives with all my Mac including my iMac. It's definitely hard to say as I would lean more towards the G-drive. I would contact G-Technology and see if they have nay suggestions.
Keep in mind that there have been many issue with OSX SL and that too maybe an issue.

Loud hum when Imac sleeps

i've been using my imac g5 for a few months with no issues what-so-ever. just recently i've run into one major issue. when the computer puts itself to sleep...i get a loud humming noise that will not stop (i think its the fan running. the power button is disabled and i have to unplug the computer and plug it back in to restart it. any idea what the problem is? i think i may have changed the power saver settings just before this issue surfaced, but i'm not sure what would cause this to happen.

What it's doing is going into sleep mode and this is normal. You should be able to wake it up just moving the mouse or pressing any keys on the keyboard. What I want to find out is whether it's hanging up when it goes to sleep or if it will wake up normally as it should regardless of the humming sound. To check the Energy Saver settings go into System Preferences/Energy Saver.
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When iMac sleeps... it shuts down external hard drives

When I wake my iMac I get the error message that my hard drives were removed, could cause damage, etc. This just started today. It's almost like the iMac kind of goes into a deeeeeeeep sleep... but the computer doesnt shut down totally. I can still wake it, takes a little longer than usual though.
Anyone know what the issue can be?
Thanks

Do you have an external drive attached?
The reason for asking is I have seen similar errors when I fail
to properly unmount or removes an external drive.
There may be a better way but when I want to turn off my
external drive (used for TM and SD), I right click on he
external HD's icon and select the EJECT option. This unmount
the drive so the power can be turned OFF and removed
from the back of the iMac. You can also do with the Disk
Utility.
Try unmounting your external drives and restart to see
if this helps.

Ethernet disconnects when imac sleeps

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