Why won't my MacBook Pro connect to the internet?

I have a similar issue with my MBP. Connection to the network and Internet had worked fine for months using an Airport Extreme. Then, over time, I've noticed the connection to the Internet taking longer and longer, while connection to the network is fine (I can hit my network drives wirelessly with no problems).

As of 2 days ago, I cannot get wireless access to the Internet on my MBP. My wife's Dell laptop can wirelessly hit the web.

Any thoughts?

By the way, @cjwinn: what does Safari have to do with accessing the web?

Resetting Safari clears out the caches of websites. These caches can slow down the internet connection and eventually halt it altogether. I know that it doesn't at first seem like it could stop the computer from connecting to the internet, but I work with MacBooks, and many times I have seen the problem completely fixed simply by resetting Safari.

I have the same problem on my iBook G4. I have reset Safari but still no connection. Am now in the process of restarting to see if this makes a difference. I'll get back to you on that one!

This is what happened so far:

I'm not a very techie person so am seriously running out of patience with my ibookG4. The situation is the following:
(sure it's simple but want to give you as much info as poss for no confusion)

I've had it since december 2007 (2nd hand) and have been using the internet at home on wireless ever since with no problem until about 8 weeks ago when the messages ...
"Do you want the application "configd" to accept incoming network connections"
and
" Do you want the application "mdnsresponder" to accept incoming network connections"
...started to pop up. At some point i may have clicked no to this but for a while it was just an annoying procedure which meant network diagnostics and entering my password every time i opened Safari.
However, the situation now is that i have airport signal at full strength, my home internet name comes up on the list of available networks, but when i open safari and type in a web address it says
"You are not connected to the internet"
When I perform Net Diagnostics is says that
"Your network configuration has changed" (i am administrator and have not changed it and everybody else in my house, macs and pcs, don't have this problem)
So, i type in the usual WEP password but it is not recognized - still no internet. I've tried turning router off then on - nothing. I called provider, they talked me through disabling airport and using ethernet which worked that day but not now after it's been off.

This may have all coincided with me synchronizing my new iPhone to ibook or the installation of a new mac desktop to the network- it all happened around the same time and all other hardware still works fine.

Anything spring to mind???

Thanks in advance.
Loz

Right, no fix unfortunately. Wanted to avoid re-installing everything as i don't have all the necessary software :( But this is by far the closest i have found to my issue on my internet quest.
I have found that when my laptop runs out of battery it resets its dates so that was rather curious - hasn't solved the problem though.
I'll keep on searching through some fixes and any help will be greatly appreciated!

Cheers
Lzxx

Boy, deja vu! I just purchased my MBP the first of September of 2008. I have an Airport Extreme as well. Initially I was able to connect to the Internet with no problems. About two days ago I started having the exact same problem. (October 3, 20008) I have OS X 10.5.2. I too can connect to my local network but cannot access the Internet. This is so with both Safari and Firefox. The ironic thing is that I can go to any local hot spot (ie. Panera Bread) and everything works fine! In addition, I can connect to the Internet with my iMac and two other PCs. I became an Apple guy about 3 years ago and have been sold on Macs every since, that is, until now! This is my second MBP, the first one crashed the 2nd week I had it!

I've been having the same sorts of problems all day (and for intermittent periods over the past few weeks). Is your firewall set to "allow all incoming connections?" That seemed to fix mine, at least for the time being. You might also want to try resetting your PRAM, repairing permissions, or try using something like ONYX to clean out your system.

I had this issue too. I was able to fix it by setting my computer's clock to the correct time, and then restarting.

I too.. like many of you have had the same problem with (1) of our Macbooks. It worked fine until just recently.... now we have to be within 30 ft. of the Airport Extreme for it to work. We have taken it in to the local Apple store and it always works just fine...We have taken it to our local Panera and there is never an issue getting online.... My son has a newer version Macbook at it has no problem connecting to the internet. I have a piece of junk Dell laptop from work.. and it has no problem connecting.... So we have tried the "Safari reset" and it seems to be working.... for now!!

i have the same problem

solved: reset your router and it works fine. i had to go through "utilities" than "airport" than reconnect like it was the first time doing so....hope i never have to do this again

My MCP connects to the connection, but nothing that requires an internet connection works. I have tried all of these suggestions, but they didn't work. I have been having this problem for a week now. I pay some bills online, I am having to use my parents iMac.

Firstly turn off your router for 2 minutes - that will clear any issues there. If you have a 802.11n router then have you the latest AirPort firmware on your mac? Is it just your browser that doesn't work or do all web applications not connect? If its just your browser try installing Firefox or Opera?

I loaded Windows Xp on Parallels two days back on my Macbook and shared the Mac network connection with Windows network. All seem fine when I was working at home. When I reached office my internet stopped working through Ethernet port which is set up on DHCP. This network was working prior to installing Windows. I have uninstalled and deleted the Windows partition but still it is giving problems. I can ping my router but am unable to open any sites.

Then I connected the Linksys AP and used the Airport. It worked perfectly for one day and now even the Airport is having same problem. I am having a Acer laptop and that is working perfectly on both ethernet and Wifi through its Windows Xp.

What can be a problem ??

I have also been having this issue, although my MBP. I purchased about a month ago and never had any connection problems, then yesterday, I came home from class and was able to connect to my home network, but could not access the internet, and now I'm experiencing this problem on ALL networks I try to connect to. I've tried resetting everything, and spent 30 minutes on the phone with Apple to no avail. I have Windows Vista installed on my BootCamp partition and it has no problem connecting to any of the networks. Is there any fix other than reinstalling OS?

I had the same problem. Macbook Pro can connect to home network but not the internet. It started out with the clock screwing up when the battery died.

Fix: I unplugged my airport extreme (did not reset) for 1 minute, then I used an ethernet to connect to the Macbook Pro, clicked on Safari, allowed outside connection, and it seems to be working. I even closed out and restart. So I hope the problem is fixed now.

Shocker: I can't believe that Apple wants to charge for the 3 year protection plan to troubleshoot this problem, when it seems like a prevalent issue.