MacBook Pro - Internet problems - DNS Prefetching?

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MacBook Pro - Internet problems - DNS Prefetching?

My MacBook Pro (10.9.1/Mavericks) has recently developed issues connecting to the Internet and loading pages. Other Apple products in my home are fine. I've had the device for almost 2.5 years with no previous problems. It's driving me crazy! My research suggests it may be down to Safari's DNS prefetching and I've done a few things (suggested online) to attempt to address this but unfortunately nothing has worked. Has anyone else experienced similar issues and can anyone help me or suggest what else it could be?

MacBook Pro, OS X Mavericks (10.9.1)

Posted on Jan 29, 2014 1:27 PM

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Answer 1

Linc Davis

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Jan 29, 2014 4:13 PM in response to Pink-Lady

Please describe the problem in more detail.

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Answer 2

Pink-Lady Author

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Jan 30, 2014 4:48 AM in response to Linc Davis

Thank you for your interest.Two things are happening, in equal measure. I either cannot get connected to the internet at all or, when I am connected and trying to access a website, the blue bar goes half way along then stops. I managed to access the internet no problem this morning but when I put my search criteria in to Google (BBC News), it would not load, despite being connected to the internet and having full wi-fi strength. After waiting 15 minutes, I switched off! We have an iPad Air, 2 iPods and an iPhone and all access the internet and perform excellently. The problem is just with the MacBook Pro and is a very recent issue.

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Answer 3

Linc Davis

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Jan 30, 2014 6:48 AM in response to Pink-Lady

Double-click anywhere in the line of text below on this page to select it, then copy it to the Clipboard by pressing the key combination command-C:

www.google.com

Launch the Network Utility application.

Step 1

Select the Lookup tab and paste into the address field (command-V). Press return. Post the output that appears below – the text, please, not a screenshot.

Step 2

Select the Ping tab and do the same. Please enter the same input as you did in Step 1. Don't use the output of Step 1 as input to Step 2.

Important Note

Some web browsers and mail clients will automatically convert a domain name such as "www.example.com" to a clickable URL, such as http://www.example.com. That will interfere with the test. If necessary, edit the input in the Network Utility window to remove any added characters.

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Answer 4

Pink-Lady Author

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Jan 31, 2014 12:14 PM in response to Linc Davis

Result of Step 1 :

Lookup has started…

www.google.com -> 173.194.41.147, 173.194.41.146, 173.194.41.148, 173.194.41.145, 173.194.41.144

Result of Step 2 :

Ping has started…

PING www.google.com (173.194.41.144): 56 data bytes

64 bytes from 173.194.41.144: icmp_seq=0 ttl=52 time=34.781 ms

64 bytes from 173.194.41.144: icmp_seq=1 ttl=52 time=37.925 ms

64 bytes from 173.194.41.144: icmp_seq=2 ttl=52 time=37.036 ms

64 bytes from 173.194.41.144: icmp_seq=3 ttl=52 time=36.939 ms

64 bytes from 173.194.41.144: icmp_seq=4 ttl=52 time=38.062 ms

64 bytes from 173.194.41.144: icmp_seq=5 ttl=52 time=40.495 ms

64 bytes from 173.194.41.144: icmp_seq=6 ttl=52 time=38.179 ms

64 bytes from 173.194.41.144: icmp_seq=7 ttl=52 time=40.263 ms

64 bytes from 173.194.41.144: icmp_seq=8 ttl=52 time=37.265 ms

64 bytes from 173.194.41.144: icmp_seq=9 ttl=52 time=42.066 ms

--- www.google.com ping statistics ---

10 packets transmitted, 10 packets received, 0.0% packet loss

round-trip min/avg/max/stddev = 34.781/38.301/42.066/1.999 ms

It may be worth mentioning that, on this occasion, I was able to connect to the internet and to the Apple Support Communities page easily!

Thank you.

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Answer 5

Linc Davis

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Jan 31, 2014 1:00 PM in response to Pink-Lady

I was able to connect to the internet and to the Apple Support Communities page easily!

But not to Google?

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Answer 6

Pink-Lady Author

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Jan 31, 2014 1:05 PM in response to Linc Davis

Yes, to Google too. Worked like the old days!

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Answer 7

Linc Davis

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Jan 31, 2014 1:10 PM in response to Pink-Lady

Hard to fix something that isn't broken.

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Answer 8

Pink-Lady Author

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Jan 31, 2014 1:14 PM in response to Linc Davis

Out of interest, was the data I sent to you 'normal'?

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Answer 9

Linc Davis

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Jan 31, 2014 1:18 PM in response to Pink-Lady

Yes.

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Answer 10

Pink-Lady Author

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Jan 31, 2014 1:22 PM in response to Linc Davis

Well that's very good to know and I would be so pleased if I had my old Mac back! I would like to thank you for your interest, it is very much appreciated. Are you happy for me to contact you again should the issue return?

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Answer 11

Linc Davis

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Jan 31, 2014 1:47 PM in response to Pink-Lady

If it happens again in the next couple of days, update this discussion. Later than that, start a new one.

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Answer 12

Pink-Lady Author

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Jan 31, 2014 1:55 PM in response to Linc Davis

OK, will do, thanks again for your time.

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Answer 13

Pink-Lady Author

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Feb 1, 2014 3:55 AM in response to Pink-Lady

Well, unfortunately, we're back to square one. Connected to the internet very quickly this morning - then it all went wrong again! Was left 'hanging' for one hour trying to connect to a webpage, then I gave up, shut down and restarted. Took 45 minutes to get to this Support page to contact you!

Herewith the diagnostics this time :

Lookup has started…

www.google.com -> The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)

Ping has started…

ping: cannot resolve www.google.com: Unknown host

Any ideas? Thank you.

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Answer 14

Linc Davis

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Feb 1, 2014 7:24 AM in response to Pink-Lady

When this happens, restart your router and your broadband device, if they're separate. Any change?

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Answer 15

Pink-Lady Author

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Feb 1, 2014 8:10 AM in response to Linc Davis

No, unfortunately no change.

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