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Wifi Signal Strong But Can't Connect (Macbook pro 13" Early 2015)

New Macbook Pro 13" has a connectivity issue over my home wifi. Every 10 minutes or so of normal operation, it has disconnected. At this point wifi is shown to be connected and the data rate is frozen [1]. On turning wifi off and on, connectivity is restored and fails again later. Other devices (phones, laptops) are able to connect and have stable connections on the home network.


Background, I've moved from an older Macbook (late 2011, OSX 10.10.5, continues to work well with the home network) to Early 2015 Macbook Pro 13" (256GB, Yosemite 10.10.4. The problem shows up after a) using Migration Assistant to install only Applications, and b) OS is updated to 10.10.5. Migration Assistant transferred only Applications from an older time machine backup of the older 2011 Macbook (did not include Computer and network settings in the transfer). After observing the problem, I tried a number of solutions [2] and failed to resolve the issue.


At one point, I attempted a clean install. As the wifi wouldn't stay up long enough (in Internet Recovery mode), I could not download fresh operating system from the internet and I'm limited to setting up from Time Machine backups.


Lastly, I setup a hotspot on my phone (still inside the home network) and observed the same symptoms with the phone hotspot as well. At this point, I was pretty sure that I might have received bad hardware so I returned the Macbook for another one under my retailers 10-day return policy.


My replacement (third) Macbook has the same problem.


This time on setting up OSX 10.10.4 I used the Macbook for about 2 hours to stream video at home. Did not observe the problem. Immediately after using Migration Assistant to transfer applications, updating to 10.10.5 I was able to observe the problem again. (I wished I had taken a time machine snapshot of the machine before Migration Assistant). I do have a few applications that might have changed the OS's network stack [3] (loosely speaking), but I can't be sure which one, or if the problem did not exist for sure before Migration Assistant copied the apps over.

Connectivity at work is 100% stable, even after Migration and Update with the third and the original Macbook.

My home network:

* Belkin Router N600DB v3 (firmware up to date).

* Its setup with DHCP "off" to allow my Macbook to setup IP address from another router which connects to my ISP.

* pre-configured DNS entries.

* Wifi is 5GHz, WPA2 (AES).

* All channel selection is Auto.


[1] Some important metrics, indicators when the problem occurs,

* Data rate is shown frozen at "7Mbps".

* Airport Utility does report the Internet status as "disconnected".

* The Macbook has a valid IP address.


[2] I've also tried the following solutions on both macbooks,

* Deleting my network files off my disk and then restarting to allow OSX to setup network settings from scratch.

* Resetting the SMC and NVRAM separately.

So far I've learned, its not Wifi interference: signal strength is 80%+. None of my neighbours are using 5GHz band and there aren't any walls in the way.

The problem may have something to do with the way the router and the Macbook are working together. I'm planning on calling Apple Support (I fall under the 90-day complimentary). I'd appreciate any help in diagnosis, or even pointers on what metrics I could be watching. So far, I have only a bunch of maybe's. It would be great if I could zero in on what's going wrong and how I can fix it.

Thank you!

MacBook Pro (Retina, 13-inch,Early 2015), OS X Yosemite (10.10.5), null

Posted on Sep 8, 2015 10:52 PM

Reply
Question marked as Top-ranking reply

Posted on Sep 9, 2015 1:21 AM

I would configure the router to use a different encryption. I would start with no encryption as a test.

10 replies

Sep 9, 2015 1:36 AM in response to lllaass

Hi Illass,

Thank you for going over my problem and for the helpful answer. I can't modify the encryption method on my router to anything other than AES. I can switch it off altogether. I've done so and I'm monitoring the connection. It seems to be working fine for the last 10+ mins, the data rate does fall to "7Mbps" when the connection is not in heavy use, but I stay connected.

What should I expect if the connection stays on for 60+mins?

Best regards,

Santosh Dawara.


Sep 9, 2015 2:34 AM in response to thinkSantosh

An update: I've called Apple and let them know through the official channels.

For now, I've covered some of the basic troubleshooting steps which includes,


* Setting the DNS manually from Network Preferences on OSX.

* Setting up a new network location profile.

* Discarding the System Configuration folder (Library > Preferences > SystemConfiguration) and allowing the OS to rebuild it.

* Turning off the encryption on the router.

Sep 13, 2015 5:30 AM in response to thinkSantosh

I've spent this weekend trying to isolate the issue. I eliminated all intermediate devices, with only the macbook, a new d-link router, a hard line from macbook to router, wireless switched off and the ISP cable modem in the way. With that setup I continued to experience the issue. This time I could in fact see the router reboot every 15 - 20 minutes of internet usage. I removed the Macbook and replaced it with a Windows machine. The setup worked well and the router stayed up for over 2 hours straight.

Although I've not been able to isolate the issue - I am absolutely certain that there's an issue that originates in the interaction between the Macbook and the Router. I've seen two different routers (a Linksys WRT54G and D-Link DIR 605-L) reboot often when working with the Macbook. I am baffled and bit frustrated.

Oct 1, 2015 7:01 PM in response to thinkSantosh

After performing a clean install of El Capitan on both (early 2015, late 2011) my Macbook wifi connections are stable. I've observed them for over a week and the earlier symptoms are no longer present (wifi connection stays strong but no connectivity). On completing the clean install, I took a comprehensive time machine snapshot. Now I'm only restoring data back to the new machines.


There's no way to be sure if this will work for others and is obviously a lossy step. Makes me think that an application install may have upset TCP parameters. Can't be sure.

Wifi Signal Strong But Can't Connect (Macbook pro 13" Early 2015)

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