When I connect imac to network via airport all devices on the network lose internet connectivity

Every device stays connected to the network but the internet stops working. Usually the network will continue to function normally for about five minutes when the imac connects, but then every device loses internet access via the network, NOT just the imac. As soon as I turn off the imac's airport they get internet connectivity back. A wired network connection to the imac seems to work OK.
The airport is configured as "Using DHCP"
Mac OS X 10.6.8
As far as I know, no changes have been made to the computer recently (but it is not my machine and the owner isn't here atm)
I found one other resource with the same problem here:
http://www.mac-forums.com/forums/internet-networking-wireless/183185-turning-my- macbook-airport-breaks-internet-connection-entire-network.html
but the solution didn't work. When I deleted the three files mentioned in the solution in that thread, my problem is not solved.
If you have any ideas or need more information I would love to hear from you.
Thanks guys.

Yes it is possible that the two machines are creating a Computer-to-Computer network and are not going through the Express.
To delete the Alias you may need to login with the Admin User.
Will
1GHz G4, 15" PowerBook, Airport Network, 1G iPod Mini Mac OS X (10.4.5) Updated - Get Started with iWeb (WillG4PB.com)

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Cannot connect iMac to iBook via Airport Express

I've been using the Airport Express for 5 months with no problems. Internet and printer are routed through AE, which is accessible by either the iMac or iBook.
In either machine's Finder, there is a referenced alias (Network folder) to the other machine. Here, I can select "connect", which connects me to the other machine.
Problem - At present, the "connect to server" connection only works on the iBook. When I select it on the iMac, the spinning beachball appears after about 30 seconds, then another panel appears - FTP File System Authenticaion", which goes absolutely nowhere. Have never seen this before. In the past the "connect to server" panel appeared, and connection was made with no problems.
Not sure why the iMac is not recognizing the iBook, i.e. the "Connect to Server" panel is not appearing?
Here is what I have done - (no change in problem):
Restarted both machines
Unplugged Airport Express and restarted
Attempted to delete the iBook's alias on the iMac - won't allow me - don't have sufficient priv)
Checked Airport settings - nothing new noted
File Sharing is "on" for both machines
Appreciate any feedback. Thanks

Yes it is possible that the two machines are creating a Computer-to-Computer network and are not going through the Express.
To delete the Alias you may need to login with the Admin User.
Will
1GHz G4, 15" PowerBook, Airport Network, 1G iPod Mini Mac OS X (10.4.5) Updated - Get Started with iWeb (WillG4PB.com)

Airport Extreme 802.11g base station loses internet connection often

I just installed an Airport Extreme base station (802.11g version Apple Base Station V5.7) last week. And it keeps dropping my internet connection at least once a day.
I simply replaced an old SMC Barricade wireless router that died (and was a POS). But I only had to reset the SMC about once every 2 months. Nothing else has changed in my setup. Only the router/base station is different.
The wireless part is fine. Even when the internet connection gets dropped the hard wired AND wireless clients can still access the local network. Reseting the DSL modem has no effect. The only solution is to power cycle (unplug and plug back in) the AEBS OR restart it from Airport Admin utility.
But you can't do that from offsite. When the AEBS drops the internet connection I can't access my office network from home!
Is there a place in Airport Admin Utility which tells you the status of your internet connection like most generic wireless routers with web-based software do?
Any ideas on resolving this?
Thanks

"Any ideas on resolving this?"
Looter,
Based on your description, open AirPort Admin Utility and check the configuration of your main base station on the "Internet" pane. If you're using ethernet cable from the modem to the base station, the top selector [Connect Using:] should show "Ethernet" and the second selector [Configure:] should show "Using DHCP"
Also, check your iMac's System Preferences>Network at "Show: AirPort" and check the PPPoE pane which should show no entries (unless your isp requires its use), and the TCP/IP pane which should show "Configure IPv4:" as being "Using DHCP" - while all other info is filled in automatically.
"Is there a place in Airport Admin Utility which tells you the status of your internet connection like most generic wireless routers with web-based software do?"
No, the AirPort Admin Utility is not web-based, only located on your computer with the information available to it necessary to operate the AirPort system. It does not actually administer the signal. I think that is done only by System Preferences>Network.
"I'm actually referring to the Airport Express base station not my MacBook Pro's wireless connection. Is there anywhere in the Airport Admin Utility software that tells you the status of the AEBS' internet connection NOT the wireless connection."
No, that info is not available in that utility. The information you seek is at System Preferences>Network, but only after the system scans for it. Click the "Assist me..." button and then, on the "Do you need assistance setting up a new network connection or solving a network problem?" panel that opens, click the "Diagnostics..." button. A "Network Diagnostics" panel will then open and if its scan shows there is no internet the lights to the left of "Internet" and "Server" will be yellow instead of green. Meanwhile, it continues scanning for the connection until it is re-established. I determined this by pulling my cable from the phone jack, later reinserting it.
Further information that may be helpful to you can undoubtedly be found in threads such as this other one:
http://discussions.apple.com/thread.jspa?threadID=884049&tstart=0
edit-
In re-reading, I may not have given you what you need. It sounds as if you may be "timing out" somehow on your connection. You might want to check around at some of your log-on settings to see if there is that possibility connected to one of them, even though the only thing I can think of is the "Renew DHCP Lease" button which is unknown to me, as I've never used it.
Message was edited by: myhighway

When I change from automatic to manual ethernet from 100baseTX to 1000baseT I lose internet connection

My iMac (21.5-inch, Late 2013) connection is automatically set at 100BaseTX. I changed to manual (from automatic) and selected 1000baseT setting in hardware settings. Lost internet connection when I did so. Is it possible to do this?

You can't magically change a slower connection into a faster one. That has to been done at the switch or the router.

All devices on network lose internet connection when Dell laptop connected

I have successfully setup my AEBS network and am using two wireless clients--HP printer and Xbox access point (both 802.11 G) and a wired iMac that also is connected via Airport (so I can move it around if i want). I tried connecting my Dell Latitude D830 wirelessly and within a few minutes of connecting the AEBS loses internet connectivity. Unplugging and restarting the AEBS restores the internet but it just drops off again in less than 10 minutes. My question is, what might be causing this and what can I do about it? One peculiar thing to me is that I am using the WEP security option since the Xbox doesn't seem to support WAP2. When connecting the Xbox it reports the network as WEP but the HP printer and Dell Laptop but suggested the network was indeed WAP even though I'm clearing using WEP security. Maybe it's nothing but wanted to add for completeness.
The Dell is running Vista Enterprise edition.
Thanks for any help.

I've noticed a similar issue. Any time my HP/Vista laptop is connected to my AEBS it loses the network connection at inconsistant time intervals(~10-15 min).

Mac Pro running 10.10.2 loses internet connection when sleeping

My Mac Pro running 10.10.2 loses its internet connection only when it goes to sleep. I always have to jump through hoops to reconnect to the internet when it wakes

Try suggested links
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MBP no longer connects to network via Airport

today my MBP will not connect to my network via airport. Several other apple devices connect to the network no problem. MBP connects to the network OK via ethernet cable.
When I try to connect it just keep prompting for network password & user password, generates spinning wheel but then returns invalid password dialogue box. Tried several times and no success - occasionally there is an additional dialogue box " Apple80211agent......."
Pass word is fine as 5 other devices connect without any issue. What is going on?
Incidentally, just thought to create another Airport connection and hey presto it connects.
Still confused.

Your local LAN runs through your router.
All your ethernet ports, and your modem and router, should be behind and filtered from excess current. That means a UPS generally. And run input line thru UPS (coax) first, then run RJ45 back through UPS again (there can still be excess surge or current on the line).
Modems and routers can be compromised by surge outage or storm. So can ethernet ports.
You have two ethernet ports and you tried with both also.
What you did not do that I would have added is SMC Reset / Reset NVRAM/PRAM.
This is what I have had for the last year, very nice and stronger signals thruout the house.
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Connect Imac to Stereo via Headphone Jack & 2nd Stereo via Airport Express

I have two whole-house stereo systems; one serving the lower level (basement) of my house and another serving the first and second floors. My iMac is on the lower level. The house was prewired with two coax cables (standard cable TV-type cables) from the area behind my stereo on the lower level to the room where my iMac is located. Using adapters from Radio Shack, I was able to directly connect my iMac to my home stereo on the lower level. I can currently play my iTunes on my lower level stereo by plugging the cable into the headphone jack on my iMac.
I am set up with a wireless network using a Linksys WRT54G. I would like to be able to also stream music from iTunes on my iMac to my home stereo on the first floor. I realize I can do this with the use of Airport Express.
My goal is to be able to play the same music from iTunes on my iMac on both stereos simultaneously. My question is; if I have my lower level stereo connected to my iMac via the headphone jack, will I still be able to stream the same music from iTunes to my upper level stereo via Airport Express? I'm concerned that by connecting the lower level stereo to the headphone jack, the music will not be able to be streamed wirelessly to the upper level stereo.
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iMac 24 in. Mac OS X (10.4.8) Wireless keyboard & mouse, Linksys WRT-54G connected wirelessly

Hi.
Assuming your iMac is no more than 50 feet from where you intend to locate the express then:
You will need to configure your airport express to join your current wireless network in client mode (otherwise you won't be able to use the internet and the express at the same time).
http://docs.info.apple.com/article.html?artnum=302153
In iTunes there is an option to select multiple speakers. Thus you select this and then check the desired options. Hence you can have music coming out of the speakers/hadphone jack on your iMac AND out of the speakers connected to the airport express.

WHEN I USED TO CONNECT INTERNET FROM MY IPHONE 4S PERSONAL HOTSPOT VIA USB, AN ICON IN THE NETWORK PREFERENCE NAMED "IPHONE" GETS OPENED.... BUT NOW THIS IS NOT HAPPENING AND I AM NOT ABLE TO CONNECCT PERSONAL HOTSPOT VIA USB CABLE. PLEASE HELP ME OUT

WHEN I USED TO CONNECT INTERNET FROM MY IPHONE 4S PERSONAL HOTSPOT VIA USB, AN ICON IN THE NETWORK PREFERENCE NAMED "IPHONE" APPEARS.... BUT NOW THIS IS NOT HAPPENING AND I AM NOT ABLE TO CONNECT PERSONAL HOTSPOT VIA USB CABLE. PLEASE HELP ME OUT???

Please don't shout! Using all uppercase means shouting on the internet. If your keyboard is stuck please say so, otherwise people will think you are being obnoxious.
Now the first question is, when you are saying connecting to personal hotspot, have you always been using the iPhone to connect to the internet? Are you someplace where the only place to connect is available via tethering to the iPhone's celluar network? Or do you have other options?

I am having trouble connecting to wifi network via airport express on my windows xp pc, but I know it is working because I can connect on my macbook, does anyone know what the problem is?

I am having trouble connecting to wifi network via airport express on my windows xp pc, but I know it is working because I can connect on my macbook, does anyone know what the problem is?

Tell us more about the problem, I can think up 100&1 different reasons, but don't have time to go through all the possibilities. So.. what happens?

I cannot get my iMac with built-in airport to allow internet connections to Nook and PS3. The devices access the network, but internet connection fails. Internet sharing is enabled, network security (WEP, WPA) is completely off. What to check next?

I cannot get my iMac with built-in airport wi-fi to allow internet connections to Nook and PS3. The devices access the network, but internet connection fails. Internet sharing is enabled, network security (WEP, WPA) is disabled. What to check next?

On an additional note, I've purchased a wireless router and everything connected on the first attempt. It just vexes me that the built-in wireless isn't working as a router. Is this another example of "Mac only plays with Mac"?

Airport extreme loses internet connection all the time with imac and macbook pro

I keep losing the internet connection with airport extreme on my imac and macbook pro but NOT with my pc

Ok, so when you say you lose internet connection, is it disconnecting from your wireless network so there are no bars?
And are there usually full bars?

Does an Airport Express require a wired connection to boost a Wi-Fi signal if I already have a wired Airport Time Capsule on the Network?

I want to boost the Wi-Fi signal around my house. I have a 3TB Airport Time Capsule connected to my Virgin Media modem via a WLAN connection but wonder if an Airport Express device can be used at a remote location purely wirelessly - apart from a power connection obviously?

Does AirPort Express require a wired connection.......if I already have a wired AirPort Time Capsule on the Network?
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The reason for this is that when you try to extend a network using wireless, you will typically lose about a half of the potential speed capability on the network.
There is no network speed loss when you wire the Express.
Here is what Apple's support document says about this:
In the case of a wirelessly extended network, throughput may be reduced to less than 60 percent of that of a single device. The general rule is to keep the Wi-Fi network as simple as possible. You can accomplish this by using the minimum number of Wi-Fi base stations required to service the physical network area and by using Ethernet wherever possible.
Extending the range of your Wi-Fi network by connecting Wi-Fi base stations together using Ethernet is always the best option, and will provide the best throughput

Airport express connected to my existing network - Can I connect a device to the network through it's ethernet port?

Is it possible when my airport express is wirelessly connected to my existing network - to connect a device to the network through it's ethernet port or is it wireless only at that point?
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Is it possible when my airport express is wirelessly connected to my existing network - to connect a device to the network through it's ethernet port or is it wireless only at that point?
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Or
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I just installed Airport Extreme. It works as a wireless network on my Macbook. It won't connect with my Windows Visa PC. Message reads: "settings saved on this computer for the network don't match requirements of the network.

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I assume that you have Wireless Security enabled on your AirPort's wireless network. The issue maybe that the PC is unable to use the WPA password itself and will require using the Equivalent Network Password instead.
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When I connect imac to network via airport all devices on the network lose internet connectivity

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