Brand new mac book pro wont connect to internet..

**turborave** · 07-22-2011 01:03 PM

was working fine, just ran latest system updates, rebooted from updates and i cant connect to the internet anymore, its connected to wifi, has an IP. it connects to skype though. no browser connectivity or other programs, itunes, app store, ect. anyone have any ideas?

**DantheVWman** · 07-22-2011 01:37 PM

reset yer router?

**turborave** · 07-22-2011 01:57 PM

wont connect with a wired ethernet connection either.. wtf.. i can make full video skype calls, but cant get to google.com

**turborave** · 07-22-2011 01:59 PM

Originally Posted by DantheVWman

reset yer router?

not really an option, im at work with 120+ connected users, doubt they will dump the internet connection for me.

i also tried connecting to my droid as a wifi hotspot, no good, its not hardware related because neither wifi or wired internet will work.. its gotta be something in the software.. dont have time to rebuild the machine because i have to take it to nyc to do a live webcast on sunday.. too many apps i need to use there to do a rebuild.. this is soo frustrating.

**adoniram7** · 07-22-2011 02:11 PM

Sounds like a dns issue.

Please put one of the following IPs into your brower (all cnn.com) and if you reach cnn.com, you definitely have a dns issue:

cnn.com. 0 IN A 157.166.255.19
cnn.com. 0 IN A 157.166.224.25
cnn.com. 0 IN A 157.166.224.26
cnn.com. 0 IN A 157.166.226.25
cnn.com. 0 IN A 157.166.226.26

If so, you need to get into the Network Properties, Advanced, and see what's in there for your DNS server. Ask your sys admin for the correct information.

**turborave** · 07-22-2011 02:35 PM

Originally Posted by adoniram7

Sounds like a dns issue.

Please put one of the following IPs into your brower (all cnn.com) and if you reach cnn.com, you definitely have a dns issue:

cnn.com. 0 IN A 157.166.255.19
cnn.com. 0 IN A 157.166.224.25
cnn.com. 0 IN A 157.166.224.26
cnn.com. 0 IN A 157.166.226.25
cnn.com. 0 IN A 157.166.226.26

If so, you need to get into the Network Properties, Advanced, and see what's in there for your DNS server. Ask your sys admin for the correct information.

ok, those last 4 connected.. i went in and cleared out my dns settings. put in some good ones from the network config on my ipad, its connected to the same router, and it still wont get anywhere

this is so wierd..

im smelling a rebuild..

**adoniram7** · 07-22-2011 02:37 PM

Probably not your system. Almost certainly the router won't let you route.

As the first respondent said, reset the router.

**turborave** · 07-22-2011 02:41 PM

but it doesnt work on my droid wifi hotspot either.. i guess i'll take the system and software disks home with me and test it on my home network where i have more control. i still dont get why it would work this morning, but then crap out after the restart... thanks for your help guys.

**turborave** · 07-22-2011 03:28 PM

connects to google.com via IP as well... through the companies wifi and through my wifi on my droid. but google.com is no go..

**turborave** · 07-22-2011 06:38 PM

connected to my home network, still no good, so it cant be the works dns servers.. not really sure whats up here

i guess i need a fresh os install, crapcakes.

**azunderg** · 07-22-2011 07:03 PM

you already paid for the apple support. why not use it?

**turborave** · 07-22-2011 08:21 PM

re-onstalled OS, seems to be going ok, all apps are working.. connected to the net.. did a re-install not a fresh install.

**Jader Pack** · 07-22-2011 08:28 PM

This is a rather common and annoying problem with Macs that connect to a number of networks. It seems particularly common when connecting to corporate networks like you seem to be. There's a very good chance it was your computer's Directory Services cache inhibiting your computer's ability to correctly resolve IPs.

Several Mac multi-utilities (like Cocktail or TinkerTool System) allow you to flush the cache. I use the latter, but the former is good too. You could also pay nothing and figure out how to do it with the command line, but I'm lazy. I find that doing this every few months helps keep my connection reliable at work.

Good luck!

**turborave** · 07-22-2011 08:52 PM

yup, after the OS refresh, it seems to be working ok, im posting from the culprit now.. im nervous about only taking this laptop now! lol...

**matt007** · 07-23-2011 02:59 AM

dscacheutil -flushcache in terminal will flush the dns cache, I've had to do it a few times

**turborave** · 07-23-2011 07:13 AM

good info for if this ever happens again.. would have liked to have seen if that would have worked. what causes this?

**Jader Pack** · 07-23-2011 01:41 PM

Originally Posted by turborave

good info for if this ever happens again.. would have liked to have seen if that would have worked. what causes this?

The OS seems to rely too heavily on the cached information and prefers network failure to updating the cached information. It's been a longstanding issue with Mac OS X.

Matt007's terminal command looks like the easiest way to do it, I just never bothered to look up the command.

**matt007** · 07-30-2011 01:53 AM

this seems to happen when comcast sends bogus dns info to help redirect your browser to their activation dialogs as well, quite annoying, it doesn't seem to fix itelf easily, it loves to hang onto the bogus dns info

**DuNa** · 08-19-2011 10:08 AM

Usually a software update fixes it.

**DuNa** · 08-19-2011 10:09 AM

Or, take it to Apple and complain, and make them fix it! =)

**turborave** · 09-12-2011 09:32 AM

ok, this is happening again on a different mac..

but, there is a windows 7 virtual machine on there, using fusion, that can connect to the web just fine

i tried the flushcache command in the terminal and it did not fix anything... should there be some kind of confirmation that it worked after i put in the command? it just goes to a new line on the terminal window..

any help would be appreciated! arg!

**turborave** · 09-12-2011 04:17 PM

now the windows 7 machine wont log in anymore, something about the trust relationship to from the workstation to the domain controller, i suspect it has something to do with this issue..

also, if i boot from the installation media and run the network utility, i can ping named sites, but if i do it in the OS, i cant!

i went in and tried to do the same thing that i had done for the previous mac book pro, but its not letting me install the os on top of the current os, like i thought i was able to do before.. arg..

**turborave** · 11-28-2011 01:21 PM

update on this issue, it happened to the mac book air again..

http://reviews.cnet.com/8301-13727_7-10471471-263.html

that fixed it..

text from the link:

Apple has released a knowledgebase article (reprinted here) that covers details regarding DNS server handling in 10.6 and the 10.6.3 update. In Mac OS X v10.6 and later, the search order of DNS servers specificed in Network preferences is dynamic, so that servers that don't respond are moved to the end of the search order. This provides performance and reliability improvements over previous Mac OS X versions, but it can lead to unexpected results where a strict search order is required in Mac OS X v10.6.

With Mac OS X v10.6.3 and later, DNS servers can be searched in a strict order by making a change to the mDNSResponder plist as an administrator. Learn how in this advanced article.

To search DNS servers in a strict order in Mac OS X v10.6.3 or later

Note: Making this change will result in DNS servers being tried in the specified search order for all queries, even if a server is not responsive. This may affect performance and reliability.

1.

Log in as an administrator if you aren't already.
2.

Back up the mDNSResponder.plist file if you haven't. To do this:
1.

Open Terminal (in /Applications/Utilities)
2.

Execute this command on a single line:

sudo mv /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist /System/Library/com.apple.mDNSResponder.plist_previous_LaunchDaemo n

(NOTE: Apple's article says to use "mv," but you should use "cp" in this command. Alternatively, just go to the mentioned folder via the Finder and copy the file to an alternate location.)
3.

Close Terminal.
3.

Open the com.apple.mDNSResponder.plist file in a text editor (the file is located in /System/Library/LaunchDaemons/ ).
4.

Locate the following key in the file:

EnableTransactions

5.

Between the last and , add the following lines:

StrictUnicastOrdering

6.

Save the file.
7.

Open Terminal.
8.

Restart mDNSResponder using these two commands:

sudo launchctl unload /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

sudo launchctl load /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

Additional Information

In Mac OS X v10.6, the default DNS server searching behavior is that when a server does not return a result (returning SERV_FAIL for a query), and other servers are available to query, the server is temporarily disabled in the search order for about thirty seconds. If there is more than one server for the query and all of them have returned SERV_FAIL, the servers will be queried in the order that they were disabled (that is, the server that has been disabled the longest will be used first).

**turborave** · 05-06-2012 08:23 AM

and now its happening to my own mac book pro, but only on the wifi, when i use a ethernet cable its fine! what gives with this! as many times as i have had it happen to me i cant believe its not a more common problem.

**Santos@Ross-Tech.com** · 05-07-2012 12:19 PM

I ran into a similar problem yesterday after installing the latest combo update. My fix was to re-enable the OSX firewall and disable it.

**turborave** · 05-19-2012 09:00 AM

taking my mac book pro on the road, so i need to fix the issue.. tried turning the firewall on and off. nothing.. guess i will apply my fix.

**turborave** · 05-19-2012 09:09 AM

and my fix doesnt even work :/

VWVortex

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