Connecting to Internet over open network sometimes works, sometimes doesn't

I don't have internet where I live so I have been using an open network in the same building to connect. Sometimes I can connect to the network and the Internet, but sometimes I can connect only to the network and not the Internet. In this case AirPort status in System Preferences - Network says something like 'AirPort has a self-assigned IP address and may not be able to connect to the Internet.' Why am I sometimes able to connect to the Internet but sometimes not?

So it sounds like I can only use it when other people aren't? Or no more than a fixed number of computers?
Sounds to be the case, (any idea how many might be connecting?), but just thought of one more thing to try, when it's available but can't get an IP, choose "Other..." and type in the SSID.
Might give a try when it does get an IP, with this tool, to get an idea...
http://sourceforge.net/project/showfiles.php?group_id=25534

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Why are my connection bars (internet and phone) blue sometimes and sometimes gray? I'm sure this is an easy one

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I recently bought an Apple TV and hooked it up to my Sony 46" HD LCD TV.
My desktop is an iMac running Mac OSX Leopard
I have created a WiFi network using the AirportExpress conected to an ADSL router.
The wireless network is working fine and I have access to internet through my iMac or other PC and Apple laptops.
Yesterday, I tried installing my new AppleTV following the little instruction book. My problem is that while the AppleTV detects my network (it shows up as the network) and on choosing this network connects to the network but gives a message that it has not connected to internet.
As a result while it synchronises with iTunes on my iMac, it fails to download from the internet directly. I am unable to upgrade to the latest version or play YouTube or images from my MobileMe account or log on directly to the iTune Store.
I have tried figuring out the problem but unable to do so. Thanks for your help.

I am having a similar (or identical) problem. I have a network running on my airport extreme. My imac and my girlfriend's laptop can connect to the internet without issue. The apple tv finds my network and reports that it connects, yet it doesn't seem to. I cannot access trailers or youtube, cannot update, and cannot play purchased content. I reset the apple TV, but that did not solve the problem. Should I reset the airport extreme?

AirPort no longer connects to internet but local networking is fine.

I have an Airport Extreme router version 7.6.3. Recently the router has been dropping connections with my cable modem. I have had to reboot the modem and the router to reconnect. It is no longer connecting to the internet at all. All of my wireless devices can find the Airport and connect to my local WiFi network but no internet access. I tried connecting my macbook directly to the cable modem via ethernet cable and had some of the fastest internet connections in recent memory. How do I make the router work?

mopar408 wrote:
I did. They very politely told me - after checking the connection for 15 mintues with me online - that it appeared to be a router issue from thier perspective. I was wondering if there is some way to test the routers basic functions, etc.
If you haven't already done so, install 5.6 utility on your Mac..
How to load 5.6 into ML.
1. Download 5.6 for Lion.
http://support.apple.com/kb/DL1482
Click to open the dmg but do not attempt to install the pkg.. it won't work anyway.
Leave the package open on the desktop so you can see the file. AirportUtility56.pkg
2. Download and install unpkg.
http://www.timdoug.com/unpkg/
Run unpkg on the desktop.. If your Mac refuses to run the software, because it wasn’t downloaded from the Apple store, go to security in preferences and allow other software to work.. this is limitation of trade methinks. You can set back later if you like.
Now drag the AirPortUtility56.pkg file over to unpkg.. and it will create a new directory of the same name on the desktop.. in finder, open the new directory, drill down.. applications, utilities .. there lo and behold is Airport utility 5.6 .. drag it to your main utilities directory or just run it from current location.
You cannot uninstall version 6 (now 6.3 if you updated) so don't try.. and you cannot or should not run them both at the same time.. although I have had no problems when doing so.
Roll the firmware version back to 7.6.1 or earlier if it will work.. the latest firmware is not the greatest by a long shot.
Then using 5.6 utility you can access the advanced logs on the Extreme.. you cannot do that with v6 utility.
It should show disconnections happening.
You can also access the WAN ethernet settings and set the Airport to 100mbit full duplex.. this seems to have helped people lately.
Of course nothing like this exists in v6 utility.. being a toy utility.

IMac G5 isight Can No longer connect to internet over Airport

I have an iMac G5 that has been working fine on my Airport Extreme wireless network for 3 years. Suddenly, I can no longer access the internet over my Airport connection. The computer is on my local Airport network wirelessly (I can access it from my laptop and share files). I can connect to the internet from 4 other computers connected to the same wireless Airport network (2 MacBook Pro's, 1 Powermac G4). In addition, if I connect my iMac to my laptop via a twisted pair ethernet cable and turn on internet sharing on my laptop, my iMac can connect to the internet. All systems are running 10.5.5 and no firewalls in place. I checked my internet preferences and they have not been changed from what they were before when it was working. DOES ANYONE HAVE ANY IDEA WHY SUDDENLY IT STOPPED CONNECTING TO THE INTERNET OVER MY WIRELESS AIRPORT CONNECTION?

I have just experienced the same situation. Everything was working fine and now I can't connect to my airport from my macbook pro. I also have an iMac G5 working perfectly well on the same airport.
Could it be a latest update that has caused the problem?

Trouble connecting to internet via other networks

When away from home, my MacBook Air sometimes will not connect to the Internet, even though I am connected to the host's wireless network. In Network preferences, the status says, "AirPort is connected to [name of host network] and has the IP address [xxx.xxx.x.xxx]." However, Safari will timeout with a network not available message. So I am connected to a host router, but not the Internet. This only happens outside my house, never at home.
Before, during and after I connect to the outside router, I will get pop-up warnings (source unknown) that tell me my (specifically named) AirPort Extreme cannot be found. I don't know whether the OS, or some application, is responsible for this, nor why it isn't apparent to (whatever originates the warning) that I am connected to another wireless router/network. I don't know if this indicates a symptom or a cause, however.
This problem is intermittent, and is not confined to any particular outside network; it happens on networks I've never used before, and on networks I've used successfully in the past. I have perused the Console, but frankly I don't know what to look for. Using Network Diagnostics from Safari leads to a dead end. The only thing that ever helps me get connected, when this happens, is to use "Assist me" in Network preferences. What it does or how it does it is a mystery to me. This is why I'm here.
My question:
Rather than ask anyone to guide me to specific solutions (given that I have not gathered enough specific information), I would like to know what things I should look for and take note of when this happens, either generally or specifically. This way, I will be able to offer more specific information if or when this happens again. Anything you can advise me to put on my checklist to help diagnose this in the future will be much appreciated. Since I cannot reproduce the problem at will, tuning my radar seems like the best approach for now. Thanks in advance.

If you want to analyze the problem, the first place I'd check is under the Advanced button of the Network panel of System Preferences. Select the DNS tab and see if what you see for "DNS Servers".
On the other hand, it might help to reset the connection settings on your Mac using these steps one at a time until the problem is resolved, recognizing that, depending on your problem, not all of these steps will make sense:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) Try to select your Wi-Fi network from the AirPort menu.
3) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
4) In the same panel as (3), define a new location and see if you can make that work.
5) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease".
6) In the folder /Library/Preferences ( _not_ <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.
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IMac G5 Can't Connect to Internet over Airport

I have an iMac G5 that has been working fine on my Airport Extreme wireless network for 3 years. Suddenly, I can no longer access the internet over my Airport connection. The computer is on my local Airport network wirelessly (I can access it from my laptop and share files). I can connect to the internet from 4 other computers connected to the same wireless Airport network (2 MacBook Pro's, 1 Powermac G4). In addition, if I connect my iMac to my laptop via a twisted pair ethernet cable and turn on internet sharing on my laptop, my iMac can connect to the internet. All systems are running 10.5.5 and no firewalls in place. I checked my internet preferences and they have not been changed from what they were before when it was working. DOES ANYONE HAVE ANY IDEA WHY SUDDENLY IT STOPPED CONNECTING TO THE INTERNET OVER MY WIRELESS AIRPORT CONNECTION?

Apple Discussions!
Suggest that you cross-post in the AirPort Forums
BTW: Typing in caps is considered shouting in cyber space. We can all hear you. Also, it's very hard to read.
Thank you for your consideration in this matter.

Can't connect to internet even though Network prefs show all green lights

I have 3 iMacs in our office with the same issue.
I can get them to connect to the internet using Airport but not Ethernet. When I connect the ethernet the computers network preference screen shows that a green light and that an ip address has been assigned via DHCP.
When the ethernet is connected I can connect to other computers on the network but cannot access any external sites.
Things I've tried:
-repair permissions
-making sure OS X firewall is off
-I tried to ping the router = got response
-Tried pinging other internal office IP address = got reponse
-Tried pinging external sites = no reponse
-I've tried restarting the router and the DSL modem and the computers, but nothing works.
Any ideas?

This is usually the other way round: users can connect with Ethernet but not with Airport, so my first reaction is to think about a hardware problem with the router. I would have thought DNS might be a problem (not excluded totally) but you are not able to ping to external sites, while you can ping the router and other devices on the LAN.
To help refining the problem, how about other (non-Mac) computers: do you have any there; and are they suffering the same problem? If so, the problem may be in the router and it may be an idea to try with another. If not, there is a problem with the settings on the Macs.
When did this problem start; and what changes did you make around that time?

Can't connect to internet through Airport network

Previously - worked
Internet: DSL
Network: via Airport Extreme
Computers: 3 (G4 Tower, PowerBook G4, Xbox360)
Setup: I ran the ethernet cable out of the modem into the Aiport Extreme. Then I ran another ethernet cable into a router which then split the signal into two lines -- one going to the tower and one going to the Xbox. The laptop connected wirelessly. This worked using DHCP assigning multiple IP addresses to all on the network and indeed the two computers surfed the net with ease and I had no problems connecting or staying on Xbox Live.
Currently - doesn't work
Internet: Cable (Charter)
Network: same
Computers: same
Problem: I recently switched from DSL to Cable internet for faster speed. Here is what i found: When i connect the ethernet cable directly into the tower from the modem i can access the internet. If i connect the ethernet cable directly into the PowerBook G4 i get nothing. If i try to connect the ethernet cable to the Airport from the modem i get nothing as well. At first all i thought i had to do was change the account settings from that of the DSL to that of the Cable internet -- only there are no account settings for the Cable internet. I literally just plugged in the cable and was ready to go. I have tried resetting my airport to get rid of my previous [DSL] settings and redoing the Airport Setup Assistant to no avail.
G4 Tower, PowerBook G4 Mac OS X (10.3.9)

ok so i unplugged my modem for a few minutes and then plugged the ethernet into the airport and turned the modem back on. now i can get internet on both my laptop and my tower. that works, thanks!
an odd aside tho is that before, when i was connecting through PPPoE, the laptop would automatically connect to my network (regardless of how many networks the airport card was picking up). now that i have the airport set to just connect via ethernet i have to manually log onto my network every time. is there a setting i'm forgetting about that enables automatic log in or is this just the case with connecting via ethernet?
here is the next problem, though. i bought a wireless adapter for my 360 and it cannot detect my network. it detects two other different networks that are in my complex but not mine. i have no idea if this is an airport issue or a 360 issue as powerbooks just automatically detect an airport base station. i have tried testing it in the same room as the airport with no luck. the only way i have connected to Xbox Live so far was to hard line an ethernet cable to the 360, shut the modem off, turn it back on and connect that way. if anyone knows anything about the 360 or has had similar problems trying to get their 360 up and running wirelessly through an airport please let me know
Mac OS X (10.3.9)
Mac OS X (10.3.9)

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Hi,
I recently provided my phone to my youngest son so I went to Verizon and got a new sim card and had them set it up. Everything worked for about a week or so. Now the phone will not connect to the internet via the mobile network. The only way he can connect to the internet is via the WiFi.
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I have a brand new Macbook PRO with the latest OS and the latest EFI. I haven't installed any 3'rd party products except Moneywell for my private finances. After a couple of days it couldn't connect to internet after sleep. I run the network diag and it says the connection is OK. Log out/in doesn't help. I have to reboot everytime it wakes up after sleep. Any clue?
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Connecting to Internet over open network sometimes works, sometimes doesn't

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