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.
http://www.amazon.com/NETGEAR-Wireless-Router-Gigabit-R6200/dp/B008HO9DIG/

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Mac Pro no longer connects to network via ethernet.

Since coing back from Thanksgiving break and my Mac Pro 1,1 will no longer connect to my router through via ethernet. This means I can neither connect to internet nor connect to devices like my laptop and Apple TV. Strangely, I can still connect to my Mac Pro from these devices to share screen, play audio/video through iTunes, etc. In Network Settings, I still have a green dot, and I still get an IP address assigned (though I usually use a fixed IP). If I go into my router (Netgear WNDR4000), the router tells me that the Mac Pro 1,1 is connected to the network.
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Please Help!

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.
http://www.amazon.com/NETGEAR-Wireless-Router-Gigabit-R6200/dp/B008HO9DIG/

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Be very careful about the sequence you do it. You must make sure that the airport connection is turned off (i.e. the airport menu icon looks more like a profiled eyeball without the iris than a series of lines like the towers of hanoi). Then create a new location in the Airport network preference, and make sure that these settings are there under Options
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I've tried restarting the wireless router, no success. I'm only able to access the internet when I'm plugged in directly to the router.
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Um it's an AT&T DSL wireless router. Yes, my room mate uses the wireless. On my computer in the top right by the airport signal, when you click it, our network is shown with a check next to it, so it must be the signal from our router.
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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?

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The problem is that the AirPort Express (AX) is creating a subnet.
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When I connect imac to network via airport all devices on the network lose internet connectivity

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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.
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To delete the Alias you may need to login with the Admin User.
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If you have a Modem Router combined and an Airport Express
The Express must be set up to NOT DISTRIBUTE IP's.
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If you are using all Apple Airport products the confiquration is pretty straight forward.
If you are using 3rd party products then the set up can be a little different.
From what you say in your post you are using 2 routers, my quess is the Express is set up to distribute IP's and if your other router is set up this way then thats your problem.
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Hi Dennas,
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Generally the one you want to use will start with 192.168.x.y, or 10.0.x.y, then it'd look something like this...
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Subnet Mask: 255.255.255.0
Router: 192.168.0.1
or...
IP: 10.0.0.9
Subnet Mask: 255.255.255.0
Router: 10.0.0.1
All Computers should have the same Router IP & Subnet Mask, but only the 1st 3 numbers of the IP are the same, the 4th number has to be different, & if Static you need to set that 4th number higher than the number of computers connected+1 so DHCP ones won't get duplicate IPs.
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Try connecting your computer/laptop directly to the base station with an ethernet cable to one of the external ports and install your network settings. If it finds it there, it will find it after you've reloaded your network info to the base via the Apple Utility. Hopefully when you disconnect afterward, all will be fine. Be sure not to select "closed" network although Macs will login with no prolem, PC's have trouble doing so even with the network data stored in the internet settings.
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Hi Jenroses,
I would suggest backing up your iPad and updating it to the latest iOS, which is iOS 6.1.4
The links below should help you with this:
Choosing an iOS backup method (Should I use iTunes or iCloud to back up my iOS device?)
iOS: How to update your iPhone, iPad, or iPod touch
iOS: Troubleshooting Wi-Fi networks and connections
Be sure that you are in range of your Wi-Fi router (access point).
Tap Settings > Wi-Fi and turn Wi-Fi off and then on again.If unable to do so, see this article.
Confirm that your Wi-Fi router and Cable or DSL modem are connected to power, turned on, and indicate that they are connected to the Internet.If not, refer to your network administrator or ISP for assistance.
Restart your iOS device.
Tap Settings > Wi-Fi and locate the Wi-Fi network to which you are connected. Then tap the blue dot and choose Forget this Network. Try to connect to your desired Wi-Fi network again.
Note: You will need to enter your Wi-Fi password again if your desired network requires one.
Turn your Wi-Fi router off and then on again2. If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
Update your device to the latest version of software.
Update your Wi-Fi router to the latest firmware2.For AirPort Base Stations, see this article for information about firmware updates.
If your issue is still unresolved
Follow the steps below for the issue you are experiencing.
Unable to locate a Wi-Fi network
Unable to connect to a Wi-Fi network
Wi-Fi disconnects, or signal strength is less than expected
Unable to access the Internet while connected to Wi-Fi
Unable to automatically connect to Wi-Fi
I hope this information helps ....
Have a great day!
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Thanks for the response, Camelot. It is still no go. This is what I did. For the G5:
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Seems a curly one to me.

MBP no longer connects to network via Airport

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