MacBook won't connect to the internet!!!

What kind of router, where are you trying to connect, home or somewhere else? How many devices are connected to that router, and is there a wired port you can link into? Do you have the Ethernet adapter to test this? I highly recommend getting one if you don't.

My home network has a from ATT and it has problems with some apple devices. We have 3 laptops, 2 are apple and one HP. 2 iPhones and an iPad. A temp fix was to set up static IP on several of the devices, it's important to include the DNS entries.

YESS BDAqua. WHAT YOU SAID WORKED FOR ME PERFECTLY. Instead of joining it from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed. Before I went through network diagnostics and all of that stuff in system preferences, and then I tried the "Join Other Network" method, and now it works like a dream. Thank you BDAqua.

I found a solution! I called Apple, and here's their instructions:

Turn off your modem/router.

Turn off your airport wireless connection.

Drag the System Configuration file to the trash (Hard drive > Library > Preferences > at the bottom)

Shut down your computer

After about 3 minutes or so, turn on your modem until it's powered up fully.

On your computer, (do this quickly) hold down Command + Control + R and turn on your computer and immediately start holding down P in addition until you hear a second start up sound, and then let go. It should work perfectly after this! Good luck!!!!

Might be weird, but deleting the Airport service, clicking Apply and then recreating it just worked. Macbook Pro (2008) suddenly decided to have full wireless connectivity, but Safari, Mail and a couple of menu bar widgets just could not connect. Thanks for the tip.

I had the same issue, connected to wifi but no internet access. Everyone else in my household connected wiht no issues. After trying the solutions here still didn't work. Talked with applecare and we finally got it resolved. So in case all else fails try this.

Open finder

click GO

click Computer

click Macintosh HD (I'm on Lion, 10.7.5)

click Library

check folder Startupitems(in my case it was empty. If you have files move them to your desktop)

check folder Launchdaemons(move all files to desktop)

Last check folder LaunchAgents(move all files to desktop)

Logout and log back in.

Hopefully your back online. If so you can take the time to put certain files back in the folders to pinpoint which one causes the issue. Me personally I just deleted all the files since they weren't important. They were all updater files for certain applications.

Hopes this helps!

Hello mayfi944 or others who have similar issues,

If your Macbook shows it has no issue with connecting to your home router or gateway router, then the problem may be there is a possible bug in OS X.

How do you know if your Macbook has no issue with connecting to your home router? just check http://192.168.0.1/ or http://192.168.1.1/ etc. depending on your router's configuration.

If this is the case, you need reset your Macbook DNS cache. Something like

MacOS® 10.7 and 10.8

1. Click Applications.
2. Click Utilities.
3. Double-click the Terminal application.
4. Type the following command:sudo killall -HUP mDNSResponder Warning: To run this command, you will need to know the computer's Admin account password.

MacOS 10.5 and 10.6

1. Click Applications.
2. Click Utilities.
3. Double-click the Terminal application.
4. Type the following command:

   sudo dscacheutil -flushcache

Good luck!

Thank You Drk_Mtr,

deleting and re-creating the Airport service in System Preferences > Network solved this problem for me like a charm.

All is better.

Solution that worked for me was resetting the NVRAM: http://support.apple.com/kb/HT1379

Probably shouldn't have fixed it, but it did.

attention:.... it might be cisco anyconnect app problems.i have install cisco on my mac pro and after 3 day my internet gone.u can solve this problem by uninstalling from your mac.

Removing and adding back the wi-fi in networks did it. Thank you regelface.

All,

I had the same problem most of you have and I fixed it this morning. It's not a problem with the Mac Book or Lion it's a security issue with your wireless router. Most routers have a limit of how many computers/devices can connect to them (I have 2 Macs, an iPad, PS3, XBOX360, 2 smart phones). My new Mac Book Pro had many of the same symptoms and was competing with my other devices to connect. I found this website a while ago when I was setting up my "secure network" and went back to it today and it hit me! Just increase the maximum # of devices that are allowed to connect to my router.

http://technicallyeasy.net/2007/09/securing-linksys-wrt54g-wireless-router/

(this works for almost all routers not just the wireless G) Follow the directions through #4 and that should do it.

I hope this helps.

Cheers!

Bass

I had a similar problem this morning.

I took the Apple o/s update and could not connect to the Internet after that.

When I read this post, I disabled Norton and could connect again.

I will need to dig into the Norton problem.

This worked for me.

Go to Library > Preference > System Preferences

Delete com.apple.alf.plist

I got it from:

https://getsatisfaction.com/apple/topics/why_wont_my_macbook_pro_connect_to_the_ internet

I don't know why it works, but it does.

It worked on my Mac Mini and MacBook Pro.

Good luck!

Hey,

That worked. It was driving me crazy; strong signal, IP address, Network Preferences said wi-fi connected, but no internet, no iTunes Store, No update on Date and Time, or present location.

Maddening.

All fixed by deleting airport, and instantly adding it back.

Thanks,

LT

I tried many of the solutions above. Here's what worked for me for my iMac to talk to my macbook.

The problem was the self-assigned ISP one which meant the mac couldn't go on the net, despite the airport connection showing ok.

First, I had to restore internet sharing.

Second, I think I'd been trying to use the IPv6 (under the TCP/IP protocol) all the time. But I found an ISP (101.114.152.142) somewhere in the settings, and copied it to IPv4 (maybe because the macbook only has version 10.6.3?), and bingo. Miracles never cease.

Thanks all for the shared wisdom.