IMac keeps losing network connection

My iMac keeps losing the connection to my AirPort very sporadically, but very often. I keep having to open Network Assistant, choose the AirPort and the network, and re-enter the password. I then get a message that my network connection appears to be working correctly, which it then is. This could happen several times in a few hours.
I have tried creating a new network, but it still happens. We have 6 other devices on this network and do not have a problem with those devices.
Any advice?

LB60 wrote:
What am I looking for in the window that pops up?
here's a (very crude) screen shot of an iStumbler scan on my MBP
my network is called pegasus. see that it broadcasts on channel 11 (2.4 GHz band) ? see also that there are six other networks broadcasting on the same channel ? now, ideally i would change my channel to broadcast on "5" or "6", but since there are so many networks around, even those would give me interference from other networks nearby.
in the end, i decided to hardwire (using ethernet cables) most of my devices to my router (time capsule) in order to avoid interference alltogether.
also, there could be closed (hidden) networks around that only KisMac would be able to pick up.
lastly, as the read about *wireless interference* revealed, there are other sources that could interfere with your network performance: microwave ovens, cordless phones - heck, even enabling bluetooth on your very own Mac could be a source.
as an alternative to running ethernet cables throughout your place, you could consider *powerline adapters* _*such as these*_.
JGG

Similar Messages

My iMac keeps losing the connection to my chosen Airport Wi-Fi network. Anyone know why this happens?

My iMac keeps losing the connection to my chosen Airport Wi-Fi network. Anyone know why this happens?

Close all Apps and see if Activity Monitor shows any processes runnung.
Not that I think this is the cure but have you tried these resets:
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.
PRAM RESET
Zap the PRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

IMac keeps losing Wifi connection

Hello, I'm having an annoying problem where my iMac keeps losing its wifi connection. I've tried many things including messing around with the network preferences and trying an internet range extender. The only thing I can think of is that the distance from my router to my iMac has 4 walls in between, so maybe thats causing the wifi error. The only way to solve this is to disconnect and then reconnect back to the internet. This gets really annoying when I'm watching a video or trying to upload something. Thanks for your help.

Back up all data before making any changes.
Step 1
Take all the applicable steps in this support article.
Step 2
If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. Continue if you find that Wi-Fi is faster with Bluetooth disabled.
From that same menu, select Open Bluetooth Preferences. If the box labeled Discoverable is checked, uncheck it. Click the Advanced button, and in the sheet that opens, uncheck the top three boxes, if any are checked. Click OK. Enable Bluetooth and test again.
If the application called "Bluetooth Setup Assistant" is running, quit it.
Step 4
This step will erase all your settings in the Network preference pane. Make a note of them before you begin, and recreate them afterwards. It may be helpful to take screenshots of the preference pane.
Triple-click the line below on this page to select it:
/Library/Preferences/SystemConfiguration
Right-click or control-click the highlighted line and select
Services ▹ Reveal
from the contextual menu.* A folder should open with an item named "SystemConfiguration" selected. Move the selected item to the Trash. You may be prompted for your administrator password.
*If you don't see the contextual menu item, copy the selected text to the Clipboard (command-C). In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
Reset the System Management Controller.
Step 5
Make a "Genius" appointment at an Apple Store, or go to another authorized service center.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

IMac is losing network connection

Hi all, since the latest Update to ML 10.8.4, my iMac loses the connection to my NAS server (Synology Diskstation DS212+) from time to time, which results in a freezing of the Finder. Due to that, the whole system "hangs" until the "Network connection lost" info box is shown..
I can also manually disconnect from the NAS (via WebInterface of DS212), then most of the time I can access the Mac again.
Did anyone encounter similar problems? I think I can exlude the NAS server as source of the failure, because I have two more iMacs (without the newest update) that don't show that problem.
All advice is appreciated! Any ideas, hints where to look?
Best regards
Oliver

Any ideas, hints where to look?
Synology tech support, or its user forums. All third-party NAS devices use the wretched "netatalk" impletmentation of AFP, which is completely untrustworthy.

Keep losing network connection... I have to continually shut down then restart to get network connection.

We have 2 computers and Apple TV that will be connected to internet while my iPod loses its connection. It seems to happen after it goes to sleep for a while like a half hour or so, haven't actually timed how long. But I won't get iMessage notifications. As long as I am actively checking my gmail or texting or searching internet I don't lose connection, just after it sits for awhile.
New(2 months old), 32GB (still have 15GB available), iOS 7.1.2, I only have one wifi network connection setup on it and have "ask to join networks" set to off

How do I make IOS 6 keep wifi on when iPod is sleeping?

IPhoto 11 keeps losing network connection

Ever since OSX Lion and iPhoto 11, one annoyance is, when you first load iPhoto, everything is 100%. Perfect. Then you go on and work with something else and when you return to that iPhoto 11 space, click share, and all the network connections are grayed out. You cannot upload or eamil photos to anybody. The only way to reconnect is to quit iPhoto and start again. This is non-productive behavior. This is ridiculous. This defeats the whole purpose of having iPhoto.
Did I do something wrong? Did I overlook some kind of settings?
Is there anyone else out there who experience the same thing?
Is there any Apple staff or inside people here who knows what is the fix?
Please help.

No Apple developers here. Only users like yourself. Sounds like a damaged library. Try this: launch iPhoto with the Option key held down and create a new, test library. Import some photos and check to see if the same problem persists.
If it doesn't then try the following to fix your primary library: Apply the two fixes below in order as needed:
Fix #1
Launch iPhoto with the Command+Option keys held down and rebuild the library.
Since only one option can be run at a time start with Option #3, followed by #4 and then #1 as needed.
Fix #2
Using iPhoto Library Manager to Rebuild Your iPhoto Library
1 - download iPhoto Library Manager and launch.
2 - click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
3 - Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option.
4 - In the next window name the new library and select the location you want it to be placed.
5 - Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments. However, books, calendars, cards and slideshows will be lost. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.
OT

My iMac keeps losing Internet connection over WiFi

I have read many, many threads on this topic, but have yet not found a solution.
Environment:
     iMac 10.7.3, ADSL Broadband, wireless modem/router
Symptoms are:
     Browsing fine on both laptop PC and iMac, suddenly iMac says it has cannot find a page.
     Network diagnostics has red dots in last two items (Internet failed and Server failed).
     Laptop PC (also wireless) keeps working fine - so the problem is probably not the modem/router.
I can immediately fix the problem by going to Menu bar, clicking WiFi symbol, clicking "Turn Wi-fi Off" and then clicking "Turn Wi-fi On". All green lights and all is OK, until next time.
Any more suggestions?
Barry

Barry,
Can you sample your environment? Connect to your WiFi network and open a terminal (Applications - Utilities). Copy and paste these two commands, one at a time and then paste the results to this thread.
/System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport -I
/System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport -s

Keep losing network connection, especially after waking from sleep, but...

For a while now, my G5 would have intermittent problems not finding the network after it has been asleep for a bit. I used to resolve this by resetting the router, or sometimes putting the Mac back to sleep and resetting the router.
Lately, I discovered another fix: wake up my MacBook. The MacBook wakes up, connects wirelessly, and sees the network, and shortly thereafter, the G5 sees it too.
I cannot interpret this. Why would it be that the G5 would fail to see the router until after the MacBook is awake (and sees the router)? I never could figure out which component was at fault before, and this further confuses me. I mean, it seems that it has to be the G5, since if another computer can see the net on the same network, it would rule out the router and the cable modem. Right?
So what do I do about the G5, then? Yesterday, it was getting to the point where every time I woke up the G5, it wouldn't find the network (until after I woke up the MacBook).

Hi, Brent:
I would not be too quick to start swapping things out (esp. expensive things!) without letting the discussion flow. I have never seen an answer that worked except updates and not all do... see below.
My Dual 2.5GHz G5 has been doing this on and off for years. It has been networked wirelessly since I got it and I am on my third router now for other reasons. I run two other Macs (G4 mini and early IMac/Intel) as well as two laptop PCs, all wireless. None of the other machines ever has this intermittent connectivity issue - just the G5. The symptom is a stalled browser (Safari or FireFox) with the wireless symbol almost always at four bars. Once in a while (like today), the bars will fade down to two for a while, but rarely. Absolutely the only temporary fix I have found successful is to switch airport on and off. Cure may hold for a while or it may not. Have noticed some apps using airport still seem to work (an old MacStumbler utility) even when Safari locks up. Thought it might be a Safari bug, but FireFox does the same thing.
IMHO, this is fundamentally related to a G5 software issue or interaction with the airport or network card. As I noted above, code evolution is a strong factor in my experience. My problems come and go tightly linked to software updates. It is usually a night-and-day change. I am at 10.4.11 on all Macs here; problem had not been around until I ran the last big update to 4.11. Interestingly, my daughter owns a very new iMac with Leopard and has seen the same type of behavior since Day One. I have also seen this problem mentioned about Leopard and iMacs in the lay press.
Wish I could offer a solution, but I am just waiting it out again.

IMac keeps losing internet connection, won't reconnect!!!!!!!!!!!!

Hello,
I use the wifi in my house to connect to the internet on my iMac. Every 2-3 days it just disconnects and there is an exclamation mark where the wifi bar is. It says there is no ip address and sometimes in half an hour wifi starts up again. Someone after a shut down etc it still doesn't reconnect for hours, it says no ip or if it does self assigned ip.
Network diagnostics doesn't help and it just says your network configuration has changed.
This isn't a os mountain lion issue as I have reset it, its not a problem with wifi connectivity in the house as when wifi is down on my mac it still works on my tv phone ipad etc.

Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
10.4 instructions...
Is that Interface dragged to the top of Network>Show:>Network Port Configurations.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
Click OK.

IMac keeps losing internet connection

Hi I have just bought an iMac. Unpacked, set up, and away I go.
Problem. Every 30 secs or so, the internet connection stops! Only on the iMac. I have an iPhone 4 and iPad 2 and they are both connected to the internet using the same WIFI in my house.
Is there a known problem here your help would be very appreciated.
Thanks.

Well... I found something that did work for me... and I have the wifi continously working for more than 48 h now.
(to be done as admin)
1. Turn Off wifi
2. Open terminal
3. Type "sudo open /Library/Keychains/System.Keychains"
4. Search and delete the network passwords
5. Close the window
6. Reboot the iMac
7. Turn on Wifi and put your passwords again for your network
Hope that helps for you too
Cheers

Mac Mini keeps losing network connection

Hey,
I have a Mac Mini 1.1 running 10.6.8, which I use as a headless media server at home. It connects to my BT Infinity 3 router via ethernet cable, and the Wifi is disabled. I connect to it remotely via dns through dyn.com. Other products sharing the network include 2 iPhones, an MBP and a windows laptop.
The problem;
Every few days, the Mac Mini will dissapear from the network and cannot be reached either through the shared devices menu or through Remote Desktop. Only a hard reset of the Mac brings it back. Can anyone help me identify what's causing this problem?
Thanks,
Tim

This normally happens when your neighbor and you are using the same WiFi channel. Try changing the default channel in System Preferences -> Network.

Mac keeps losing network connection

I upgraded my Mac mini over the weekend to Yosemite. Upgrade went fine / no issues. However since the upgrade the Mac can no longer retain it;s IP address. It simply drops off the network.
It does this whether it's on Ethernet or wifi. I've trashed the com.apple.wifi plist's and that made no change.
This Mac never had any such issues when running Lion or Mavericks, does anyone have any idea how to resolve?

This normally happens when your neighbor and you are using the same WiFi channel. Try changing the default channel in System Preferences -> Network.

IMac keeps losing ISP, internet and Server but still connected to wifi

My Imac keeps losing ISP, Internet, and Server but is still connected to the Wifi. To recnnect, I have to go into Netwrok Diagnostics - assist me. This is happening every twenty minutes or so (sometimes less). Can anyone help? I might add that we have recently moved house and never had this problem before.

Wifi problems seem to crop up a lot on here and unfortunately there doesn't seem to be a 'one fix' solution.
However, sometimes any one of the following can help although, unfortunately, not always. In no particular order:
Check wifi security - if it's WEP change it to WPA or WPA2 (preferably, as it's more secure)
Change the wifi channel on the router
Create a new Network Location: http://support.apple.com/kb/HT5289
Reboot the router
Also take a look at this link and the links within the article for other ideas. They mainly reference Lion, but still seem to be relevant to Mountain Lion:
http://osxdaily.com/2011/11/06/lion-wi-fi-problems-solution-mac/?utm_source=feed burner&utm_medium=feed&utm_campaign=Feed%3A+osxdaily+%28OS+X+Daily%29&utm_conte n t=FaceBook
...and this link:
http://osxdaily.com/2012/11/30/resolving-stubborn-wi-fi-connection-problems-in-m ac-os-x/

My imac keeps losing ISP, INTERNET AND SERVER but still has WIFi

my iMac keeps losing ISP, INTERNET and SEVER but is still connected to the Wi-Fi and when I tern on the mac i have to connect it every time and it is on preferred net work its the Olney one then after I connect it works for about 20 min then stops and I got to network preferences and click on ASSIST ME - DIAGONSTICS and it shows ISP INTERNET AND SEVER ALL IN YELLOW.

Open System Preferences Network pane. In the sidebar, if you see things you do not use for networking, remove them (you can add them back later if they are ever needed). For example, if you don't use Bluetooth or FireWire for networking, remove them from the list of networking services. To do this, select the item on the list and click the minus sign at the bottom of the sidebar. You can leave Ethernet on the list.
NOTE: Bluetooth and FireWire networking is not related to their use for connecting devices.
Also, click on the gear icon at the bottom of the sidebar, and select Set Service Order. Make sure Wi-Fi (or AirPort for older Mac OS X) is at the top of the list.
Apply the change (and maybe restart your Mac as well). See if that makes any difference.

Can't re-order my queue on Netflix and keep losing the connection

I'm having so much trouble with Netflix! I can't re-order my queue, I keep losing the connection, and it's painfully slow. Is Netflix known to be unstable on iPad? Other internet connecitons seem to be fine.

I rarely have problems on it - I do occasionally have drops in video quality, but nothing consistent. It does require a very strong and stable network connection, and I also wonder if they have periodic "crush time" incidents on their end, considering the rapid growth of Netflix streaming.
Updating the queue is a pain on it - you can't do it on the app, and have to go to their website. I generally find it easier to do on a computer.

IMac keeps losing network connection

Similar Messages

Maybe you are looking for