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

  • Question
  • Updated 3 months ago
Why does my MacBook Pro not always connect to the internet via WiFi even when my iMac, which sits on the same desk as the notebook, does? The MacBook Pro connects to my home network, but it is unable to access the internet!
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Alex

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Posted 7 years ago

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Steven Bartley

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Oh thank god for normal people..no help from Apple but I've found some fixes that may work (worked for me now but not holding my breath that they will last!!!
Do this:
Go to Library>Preferences>System Preferences

Delete com.apple.alf.plist

This should work, I also went >System Configuration

And I also deleted these but not sure if necessary:
com.apple.airport.preferences.plist and
com.apple.network.identification.plist

Also:

System preference>Security>Firewall
Select “set access for specific service and applications”
Click “+”
Press “command+shift+g”
Type /usr/sbin
Click “go”
Select configd
Click add

Also may add mDNSResponder, racoon, DNSResponder
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sarufalam

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My macbook pro worked perfectly fine, until some days ago when it said that my IP adress is being used by someone else which is actually my sister's dell. The wireless doesn't work but it works on the dell. The problem is that is put a wired connection from the router, my macro works awesome but wireless doesn't work.

The wireless connection on top shows that my wireless is connected at full strength but it doesn't work on safari so I am thinking the safari has a problem. Can someone tell me how to fix this without re-installing, deleting some weird things or resetting safari because I have already tried these things without success.

Another weird thing is, that when I updated my macbook pro the day it wasn't working, it still didn't work. Bu the next day, the wireless was working fine.

I am really confused. is it my laptop? or is it my internet? Please tell me how to fix this problem.
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Steven Bartley

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Hey mate this seems like exactly what's happened to me over many YEARS! It's interesting that my wife also has a DELL which always works fine on airport or other routers when my macbook wont. See my fixes above, which I got from scouring the net (i'm no techie) I'm on my second day with no problem so maybe i've hit the jackpot. If it works for you please post up here so others might know it works too. Cheers
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sarufalam

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My firewall doesn't have that special services and application button. My library has preferences, but then after that, it only has weird sheets of infor. No folder called, system preferences or the url thing you showed. If I don't have these, then how do i FIX MY problem? I wasted my money on this laptop.
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sarufalam

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My firewall doesn't have that special services and application button. My library has preferences, but then after that, it only has weird sheets of infor. No folder called, system preferences or the url thing you showed. If I don't have these, then how do i FIX MY problem? I wasted my money on this laptop.
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sarufalam

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My firewall doesn't have that special services and application button. My library has preferences, but then after that, it only has weird sheets of infor. No folder called, system preferences or the url thing you showed. If I don't have these, then how do i FIX MY problem? I wasted my money on this laptop.
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sarufalam

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My firewall doesn't have that special services and application button. My library has preferences, but then after that, it only has weird sheets of infor. No folder called, system preferences or the url thing you showed. If I don't have these, then how do i FIX MY problem? I wasted my money on this laptop.
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sarufalam

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My firewall doesn't have that special services and application button. My library has preferences, but then after that, it only has weird sheets of infor. No folder called, system preferences or the url thing you showed. If I don't have these, then how do i FIX MY problem? I wasted my money on this laptop.
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Steven Bartley

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Do a spotlight search for "com.apple.alf.plist", that should show you where to find it. Again I'm no Techie so I don't know why it works, anyone have any ideas? I suspect a virus in the file - and they say Macs don't get viruses!!!
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Tim Bruins

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The stinking computer worked for years until I decided to "upgrade" to Snow Leopard. It worked for a few months then just stopped connecting. Spent hours on the phone with an Apple guy. Got wirless to work for a week, then it stopped. Called back thinking they would have a record of what we did before....nothing, No note that we had even called!.

I have been to the Apple Genius bar 4 times in the last week trying to fix this problem. They have rebuilt my library (didn't work), reinstalled the OS (still can't connect wirelessly) I keep getting a message that the connection timed out. Wireless connection works finewhen hard wired or wireless in the Apple store and outside our home but nothing works at home with this computer. My HP from work, works fine. My daughters Macbook from school works without a problem. I'll try the above fixes but does anything work for sure?
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adam.comeau

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I had this same problem a few months ago, but it went away after I got a new router. Has anybody else tried replacing their router?
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adam.comeau

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I had this same problem a few months ago, but it went away after I got a new router. Has anybody else tried replacing their router?
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Steven Bartley

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Did you try my fixes above? My Mac has worked on the net for 3 days straight now which is amazing!
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Tim Bruins

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Any router in particular or just something new?
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adam.comeau

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I was using a Linksys router when my Mac wasn't working. Now I'm using a DLink and it's working (sorry, I don't know the model numbers off the top of my head).
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Steven Bartley

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I have used several routers and all ending up with the same problem with my wife's PC having no probs
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Steven Bartley

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I have used several routers and all ending up with the same problem with my wife's PC having no probs
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Steven Bartley

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I have used several routers and all ending up with the same problem with my wife's PC having no probs
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Steven Bartley

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I've used several routers all ending up with same problem and all work with PCs
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Steven Bartley

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I have used several routers, several isps and the only common link is the damn Mac. PC has worked flawlessly on all
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Tim Bruins

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Thanks. I'll let you know how it goes. My PC works fine, my daughters Macbook works great. My wife's is the only one that doesn't work!
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Tim Bruins

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Thanks. I'll let you know how it goes. My PC works fine, my daughters Macbook works great. My wife's is the only one that doesn't work!
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Steven Bartley

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Good luck. Well the guys at several Mac service centres know noting at all about this and Apple will never admit it. It would be nice for some honesty and an open fix. I suspect it's a random hardware fault that they don't want to fess up to. I've even had the problem after a motherboard replacement so who knows why it happens!!!
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Both platforms have problems... the difference? If its a Mac, its probably worth fixing or upgrading... A PC?? If you ALWAYS back up critical data to a non-PC platform, then you can donate it and buy a new one... at least they're cheap.
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Tim Bruins

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Still can't fix it....ARRRRGGHHH
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Steven Bartley

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Does your Mac work on other wireless access points? Try your Mac at a friends place. If it works with new ones but not your old one then sounds similar to mine. Did you try my fixes?
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Steven Bartley

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Does your Mac work on other wireless access points? Try your Mac at a friends place. If it works with new ones but not your old one then sounds similar to mine. Did you try my fixes?
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Tim Bruins

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I tried but I don't have a mac book pro, just a mac book. The files you had said to look for I can't find or I can't delete....which is another issue i have been having. I try to delete certain files and it says I don't have permission! It's my computer! I have poked around trying to see where I need to go to see where administraive rights are but havent found it yet. I actually reset some of the security for my router last night and got it to work last night and first thing this morning.....then it stopped again!
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Tim Bruins

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I tried but I don't have a mac book pro, just a mac book. The files you had said to look for I can't find or I can't delete....which is another issue i have been having. I try to delete certain files and it says I don't have permission! It's my computer! I have poked around trying to see where I need to go to see where administraive rights are but havent found it yet. I actually reset some of the security for my router last night and got it to work last night and first thing this morning.....then it stopped again!
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sarufalam

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i have a very good solution....my problem was that my web proxy was on. To turn it of, go to network preferences, advanced, then you see a tab in the pop out box saying "Proxies" click there. Now, if the button " Web Proxy (http) has is ticked on in the side, click it to unclick it, if it is not chosen then there has to be another problem..... but this ways what had happened to me!
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sarufalam

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This really works, especially for the people who sometimes connect to office, school or very secure internet because for those secure internet, you need this property as HTTP is some weird thing. Many people have problems when they connect to some other internet and then at home, they just can't? this is the SOLUTION!!!!
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LahJ Zen

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Guy thanks, I was minuetes away from smashing something
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Shanaya Painter

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Alright, this may sound ridiculous but, plug in the power cord. Most MB and MBP have connectivity issues when running off of battery power. As stated by:http://support.apple.com/downloads/Ai...

I had the same issues with a three month old MacBook Pro and I seriously tried everything on this page, and more. It wasn't until I plugged the ethernet cord in, and aimed to download an update for AirPort out of desperation that it struck me that ever time it has been functional, it has indeed been plugged in. So, I jumped up, plugged the power cord in and instantaneously received perfect connection from my home WiFi. Way to have crap technology Apple.
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Rebecca

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Same worked for me!! Thank you!!!
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Barton Smith

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Same issue here:
— My MBP works everywhere but home
— Other computers and devices work at home
— My MBP even connects when running Windows 7 through bootcamp
— When MBP is connected to the network, it can sometimes stop other devices from working
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joey

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when i try and connect thougt airport i can find my conection but when
i type in my password it says its invalid ??????????????
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The forum post linked below completely worked for me and speaks english for non-tech people new to the mac world. I haven't had a problem since and if I do, I will repeat these steps!
http://discussions.info.apple.com/thr...

Good luck!
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Haley Mathes

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PERFECT. thank you
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theonlybread

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Had the 15" $2500 mac pro for about 5 months now. Hadn't had any problems with connections until today. Two other pc laptops had no problem connecting sitting side by side with my mac, but my mac kept timing out, and then telling me i was entering the invalid password. Realizing that this is actually a common occurrence among mac pros is worrisome. I hope this is not an issue that reoccurs regularly in the future, and needs a different solution each time.

For this first time though- Resetting Safari by opening browser< select Reset Safari, and then Restarting my mac did the trick. Hopefully this is will be the same solution next time something like this happens. There doesn't seem to be any logical correlation to me (regular computer-using Joe)...but it works!

What a frigging waste of time trying to troubleshoot something that malfunctions for no apparent reason, and the manufacturer is apparently not doing a darn thing to fix. (This question was asked 3 years ago!) For the price, I expect at least some accountability from the maker (uh- yes you, Apple Co.)
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Richard Garneau

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This thing blows. While it is out of warranty (Manufacturers always make their products, including Apple, hoping things will go wrong after the warranty is over so they can soak their users for more money), I still drove 40 miles to the nearest Apple store here on Long Island and waited over 5 hours for the Genius Bar only to be told he could not diagnose the exact reason that my crummy Mac could not connect via wireless at my hotel while my $400 Dell next to it connected immediately and held a signal. The Genius replaced the Airport card, which did nothing but leave me with a very sporatic connection, now I have to drive the 40 miles back to the store, then wait hours only to drop my laptop off to get the display replaced at a cost of $310. Then drive back again when it is returned and even then we still don't know if it will be fixed. Why the heck can't Apple determine what the heck is wrong with this $1500 piece of junk???!!! These things are supposed to be the best thing going?
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Dr X

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I ahd the same problem and tried re installing Ox and safari but it didnt work..
so then I went to Network preferences and deleted the airport network and created another one.... and it worked!! :)
happy chap after that :D
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tina

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I had this same problem. All my Windows based laptops were connecting fine, but my new Macbook Pro was dropping connection every 20 minutes. It was actually a problem with my router. I called netgear support and they helped me change my router settings, now my internet connection is stable.
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Paul

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My problem was solved by comparing settings from a macbook that was ok to one that was not in network settings. Found the router setting (192.168.0.1) was missing in DNS servers list on the macbook that could not see the internet. Don't know how that got deleted.
But I have had this problem in the past, and it was solved by rebooting the cable modem and the switches in my network.
Each time seems to be different.
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themansionpeople

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I had the same problem! I figured it out by deleting the DNS servers and search domains in the DNS tab of the network advanced settings. (SYSTEM PREFERENCES - NETWORK - ADVANCED - DNS TAB - HIGHLIGHT AND DELETE (MINUS).
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k.northrop718

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My MacBook Pro tells me that it is connected to the internet using the WiFi Airport. But when i open Safari it says it can't be opened or whatever. HELP?! I need the wireless access for school.
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StaticLinuxpro

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Well, your safari installation might have corrupted. If you have another browser, redownload load the safari installer, and install it. Now, you also might need to update it. In the top left of your screen, click on the apple logo and click on software update and follow the directions.
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Hello again all, I recently discovered through another random google search to try and solve this problem, that my router was too close to my wireless landline phone. Just to see if it would work, I moved the phone far away and I haven't had a problem since.

I know many of you have a unique problem, but mine was an intermittent connectivity issue that resetting and repairing and creating new connections every 10 minutes didn't fix.

Good luck!
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Wanderman

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I had the same problem as original poster (MBPS connecting to wifi network but not to Internet). Eventually stumbled upon solution:

In System Preferences/Network/Advanced, select the TCP/IP tab. I had 'Using DHCP with manual address' selected. Change this to 'Using DHCP' then click 'Renew DHCP Lease'.

Moments later, everything worked fine.

Hope that helps someone out there...
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Wanderman

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I meant 'MBP'... Thanks autocorrect...
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steve

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SOLVED: Okay, it took me some hours but I finally got it debugged. I had to enter the correct kind of security — for me this was WPA2 PERSONAL. Then it kept asking for the freaking password and I kept putting in the Admin "Password" for my 2WIRE Router. This was a problem in nomenclature. Actually, what solved it was putting in the NETWORK KEY, not the Admin Password. For mine, I am using a custom network key. Hope this helps you guys.
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NYA

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I have mac. 10.4. I have been using it since 2006 I never have internet problem with WiFi. But recently I got this problem. My skype works fine. But the firefox and other browsers do not. All the other computers with windows and linux OP systems connected to the routers via cable or wireless work fine except this mac. I rebooted the routers several time. This doesn't help. Each time I rebooted I can only browser may be 30 seconds, then the browser is gone. I don't know what could be the problem. My DHCP is automatic. Please I will need the advice on the steps to through.The strange thing is that, the window XP installed through parallel software works fine. All the browsers in XP of parallel work but not the mac. Please I need help.
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.