Q: Can't connect to the internet!

Reset your modem.

Follow these troubleshooting steps:

http://support.apple.com/kb/HT1714#one

Open the terminal. Type in this command:

ping 8.8.8.8

Let me know what happens. If it start printing results similar to this:

64 bytes from 8.8.8.8: icmp_seq=0 ttl=55 time=42.200 ms

64 bytes from 8.8.8.8: icmp_seq=1 ttl=55 time=40.637 ms

64 bytes from 8.8.8.8: icmp_seq=2 ttl=55 time=42.077 ms

64 bytes from 8.8.8.8: icmp_seq=3 ttl=55 time=41.767 ms

The at least we know you have basic connectivity. You can stop ping by pressing Ctrl-C

I am having the same issue. I did the ping test and terminal and every thing seems to be fine. Every computer in the house, including my iPad can access the Internet. My mbp connects I just can't get a web page to load

If this Ping test succeeds, that points to a possible DNS problem.

Go to System Preferences --> Netowrk

Select your Wifi network on the left and then click on

Advanced... --> DNS

Under DNS Servers list, click on the + button and add the following:

8.8.8.8

Also add this:

8.8.4.4

These two are Google's public DNS servers. If there are other items in the list, drag down to the bottom of the list so that the two above are the two on the top of the list.

Press OK and then press Apply.

Go to browser and try openning some website that didn't work before.

Unfortunately that didn't seem to work. I've even tried connecting the computer to the modem via Ethernet, still to no avail.

A few of Google's IP addresses are here:

http://compnetworking.about.com/od/traceipaddresses/f/google-ip-address.htm

Try one of them like http://74.125.224.72 and see if it opens google. (copy the full URL, not just the IP address).

If that works, then the last thing I can think of is resetting mDNSResponder. I had DNS issues on Snow Leopard and this solved them, though I had to repeat it after earch restart.

https://gist.github.com/1844353

If it didn't work, then I got nothing. I'm assuming you have tried different browsers already.

i'm having this same problem- all other devices connect to the wi-fi. It's a sharehouse as well, and the only computer/hardware having any problem connecting to the internet is my macbook pro.

i opened the terminal and typed ping 8.8.8.8...it came up with "host is down"

I connect to a random neighbors unsecured network with the macbook pro. However, this is unstable and slow.

Suggestisons? My iPhone and iPod touch connect fine to the wireless.

-Tim

after an hour of searching and many methods, i discovered this incredibly simple fix:
try disconnecting from the network and then go to "join other network" in the wi-fi menu. type in the name of your wi-fi network and type the password (you also need to tell what type of network security your wi-fi has). Hit the connect button and it should work.

rrahimi,

Thanks, your suggestion with mDNSResponder seemed to have worked, at least for now. It's a bit of an annoyance to do it every time I reboot but better than no internet...