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

Similar Messages

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

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.

Do they have plans to fix the bugs with Yosemite. I keep losing internet connection on my Mac Book

Ever since i installed Yosemite on my Mac Book pro i keep losing internet connection. Should I go back to mavericks because I just hate this Yosemite or do they plan to fix the bugs soon? I did a complete clean install and I am still having problems. I see a lot of complicated solutions and I am not that tech savvy to go into my settings. Thanks

All software has bugs. The first release (which you have) will be the worst.
Many advocate not upgrading to a new operating system until it's been out for 3 months or longer. In the Windows world many recommend not upgrading until a full year has passed.
So yes, most / some bugs and glitches will get fixed over time. If you wish to reduce your difficulties in the future wait a while before installing ANY new OS.
I suggest you post specific details on your Internet problems. How are you connected etc.

I keep losing Internet connection on my ipad 4 can anyone help?

Can anyone help? I keep losing Internet connection on my ipad 4 especially when the battery is running down

Hello there, CrumbleWeed27.
The following Knowledge Base Article should help with troubleshooting WiFi on your iPad:
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro D.

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

Unable to receive internet connection over wifi connection. Shows that I am connected to the network, but do not have internet access. Checked my firewall and turned it off. What else am I missing or should be doing differently?

Unable to receive internet connection over wifi connection. Shows that I am connected to the network, but do not have internet access. Checked my firewall and turned it off. What else am I missing or should be doing differently?

You might want to try resetting your router and your modem - just unplug the cords, leave them unplugged for about 3-5 minutes and then replug the modem and then the router in that order.
This may or may not correct your problem - call back if it doesn't.
Clinton

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.

OS X 10.9.2 (13C1021) keeps losing internet connection

All devices on the same wifi are working but my iMac keeps losing connection, any suggestions? I have an older iMac and that one also works fine. Even when I "wire" the iMac, I still have the same issue. The lose connect typically happens periodically and when it does, I lose connect for several minutes before it returns.

Several things to try. First is I get the devices work OK, however reset the router and modem and then restart the iMac in Safe Mode and then restart normally and test.
If that does not work try the steps Apple explains in http://support.apple.com/kb/HT5606

I keep losing internet connection

I have an IMac and for some reason I keep losing connection to the internet. I am using the Airport Extreme as my router. The router seems to be fine. My PC does not have any problem staying connected to the internet. When I look at settings the it appears that I am connected to the Airprt extreme on my IMac but I have no internet. I have to shut down the Iport and then reconnect. Evertime I do I will have internet for 1 second to 2 minutes and then it will drop again. I can't figure this one out! Please help!!!!!!!!!!!!!!!!!!

I have been having the same problems. I have tried unplugging, plugging everything back in. Opening airport utilities etc... My younger computers have no problem connecting no matter what the situation is. I feel that I have to tell the IMac what to do vs finding the network on its own. It is extremely frustrating what is happening. I've had my IMac for less then 5 months I do not understand. Sorry I did not help you with your problem, but I needed to vent my same frustrations!!! Apple PLEASE help!

Sorry to ask a popular question but....I keep losing internet connection...

Afternoon,
I recently bought an iMac (about a month ago) - I am quite new to the Mac world and have posted a couple of questions previously. I am using Mac OS X version 10.7.2 - 2.5 GHz Intel Core i5 (although I'm sure you can see that from here?)
I have noticed that I lose internet connection frequently which hasn't particurly impressed me as I then browse Safari on my iphone without issues. I use Virgin broadband (20mb) although no one ever gets that much I know! ;-)
I am also on a wireless connection - yes I could plug an ethernet cable in but why should I be needing to? I'm a little annoyed as I've spent a lot of money on this computer which I do love dearly, however, I do understand that nothing is perfect and on the mega annoying side, my friends keep slating me saying "See? Told you Macs are crap...blah blah..."
This never happened when I did have a PC so why does this seem to happen with Macs?
The reason I bought a Mac was purely because it is a lovely machine, it is pretty and I did actually think that I'd be having pretty much null problems with one. I also am a bit of a photographer and the screen on this Mac is amazing and pretty awesome for editing my photos. My old Gateway laptop died of BIOS death and lasted a record breaking 6 years. Prior to that, I had another laptop which was crap and died after two years, then a PC before then which was unspeakably awful. Many friends of mine have macs that have been with them for 10 years minimum, this was why I decided to buy one, for longevity purposes!
Anyway, I am sorry to ramble on but, is there something that I can do about this persistent interruption of internet? Can I do something to configure my settings?
Would really appreciate thoughts, views and some help of course. ;-)
Thanks very much
Pandora

Sometimes it's an interference issue related to all the items that use 2.4Ghz frequency.
Quote from attached article:
If you experience less-than-optimal performance on your wireless network due to interference from other wireless devices, you may be able to reduce the effect of interference by changing to a different channel on your wireless network. Less-than-optimal performance may be characterized by low signal strength in the AirPort menu bar, slow connection to the Internet, or slow file transfers between wireless computers. Simply reset the AirPort base station and it will attempt to use the 2.4 and 5GHz channels with the least interference when it starts up.
http://support.apple.com/kb/HT1365
Also in your router, use WPA2 security. WEP doesn't work well with new Macs.
Regards,
Captfred

Keep losing internet connection

I keep losing my wireless internet connection even though my wireless network connection says it's workinig. Today I can't access the website for 192.168.1.1 to try to fix it. any help?

What is the exact model number and version of your router? Who is your ISP?

Time capsule keeps losing internet connection

I seem to keep losing the internet connection, and this seems to be when Time Capsule is doing backups. It is fine most of the time, it seems to have an IP address, but I can't connect to the internet. This seems to happen when it is doing backups. Have I got the time capsule set up correctly? I am using it with BT Home Hub which is also a wireless router, and I have set up Time Capsule to join the same wireless network. Most of the time it works fine. It also works fine when connected via ethernet, so I don't think there is anything wrong with the Time Capsule, maybe just the way it's set up. Or does it always behave like that? Can anyone offer any suggestions?

I have Snow Leopard 10.6.3, I don't have 10.6.4 yet though am just about to install it, so it can't just be related to 10.6.4.
This morning when I booted up, I had lost my desktop background picture, the clock was wrong and my keychains seemed to be messed up. Nothing else seemed to be wrong, but I restored a backup anyway, and repaired the keychains. I don't know whether this had anything to do with Time Capsule or not, but I have my suspicions. At the moment I have connected the Mac to the Time Capsule by ethernet, and that seems to be OK, but I'd like to be able to put the Time Capsule in another room, to extend the range of the wireless network. I did wonder if there could be interference between Time Capsule and the Home Hub, as they are quite close to each other.
I do not seem to have any problems when using my Macbook Pro.

Streaming MacBooks Internet Connection over WiFi

Hi together,
I've got the problem that i won't have an internet connection in my house for quite some time now.
I own an iPhone and a MacBook Pro. I'm usually using the "personal hotspot" feature to access the internet from the MacBook.
The problem is now that both my PS3 or other devices can't connect to the internet.
My idea is to connect the MacBook via Ethernet or WiFi to an Airport Extreme Station in order to share the MacBooks internet connection all over the network and with the PS3.
Is this somehow possible or can the "tethered" internet of the MacBook not be shared through a network?
Best Regards,
Marc

For the better connectivity please verify that you have got an 802.11n card in your computer. New generation routers (i.e. E1200) speaks an entirely different language than 802.11g cards, so while those adapters can work with the E1200 for example, they are not optimized to work with it. It is like having to translate from one language to another in real time when going from N to G... So in those cases the old router will show a stronger signal than the new one.

Sharing internet connection over wifi - 2 questions

I have a Mac mini that is connected to a cable modem by ethernet, and then broadcasts a wireless network to share that connection. It seems silly to buy a wireless router when one of my computers can be the router.
The mini's firewall is enabled, and has a few ports open to allow computers on the network to use email, web, ssh and other services. I have two questoins that have been nagging me about this setup:
1) I can log into the mini from outside via ssh with its IP address. But what if I want to log into another computer on the network? My iMac has an internal IP address of 10.0.x.x... how do I ssh to that address from outside the firewall? Would it look like "ssh y.y.y.y:z.z.z.z"?
2) When I tell my firewall to block all UDP traffic (seems like a sensible option to make the setup more secure) email and other services no longer work on computers on the LAN. Must UDP traffic be open for the internet connection to be shared?

>1) I can log into the mini from outside via ssh with its IP address. But what if I want to log into another computer on the network? My iMac has an internal IP address of 10.0.x.x... how do I ssh to that address from outside the firewall? Would it look like "ssh y.y.y.y:z.z.z.z"?
You can't log into a system 'behind' the Mini without playing lots of games regarding port forwarding (for which there is no built-in GUI). In addition to that you can't use port 22 since that will always point to the Mini itself. What you'll have to do is use some other port (e.g. port 2222) and have the mini forward that to port 22 on the internal machine. Then you can connect to port 2222 on your public IP address and get forwarded to the internal machine. PITA to manage, though.
>2) When I tell my firewall to block all UDP traffic (seems like a sensible option to make the setup more secure) email and other services no longer work on computers on the LAN. Must UDP traffic be open for the internet connection to be shared?
Blocking UDP is no security feature at all - either your machine is listening to the UDP socket or it isn't.
In any case, DNS typically uses UDP, so you're blocking your DNS queries and that's most likely to be what's hindering your network.

My iMac keeps losing Internet connection over WiFi

Similar Messages

Maybe you are looking for