I have a Mac Pro 4,1 that was just upgraded to OS X 10.10.2 (14C109). I've used an ASUS PCE-AC68 wireless adaptor since Mavericks, and haven't had any problems before now. I understand that this isn't exactly a supported configuration, but the card was plug-and-play since I first purchased it.

Since the OS X 10.10.2 update, the card regularly drops its connection to the router, and rarely is able to reconnect. Running a command such as traceroute to try to see if anything is happening between the computer and the router just yields timeout errors, although the System Preferences "Neworking" panel claims that the network is still connected. Other devices have no problems connecting to the same network from the same location, including a MacBook Pro 10,1 running OS X 10.10.2.

Is there anybody encountering a similar problem or who might be able suggest ways to troubleshoot? Thanks!

  • do you have any more information for us to be able to help you.
    – Ruskes
    Feb 13, 2015 at 3:51
  • Can we see the WiFi connection details from Computer to the Router?
    – Ruskes
    Feb 13, 2015 at 4:12
  • I guess I'm not sure what you're asking for? The computer is just doing a standard connection to a WPA2 network, IP provisioned by DHCP. Everything is essentially on the default automatic settings.
    – Sourcerer
    Feb 13, 2015 at 5:07
  • Sounds pretty basic, but creating an open Guest network and connecting to that has allowed devices future connections to regular passworded network.
    – Zo219
    Feb 13, 2015 at 5:12
  • Your RSSI, 802.11?, Transmit rate ? MCS index? ect.. Things like Terminal commands for netstat, ipconfig, ifconfig and other information to determine why is your WiFi dropping.
    – Ruskes
    Feb 13, 2015 at 5:26

2 Answers 2


Downgrade driver back to version 7.0 from current 7.1 version. Follow the instructions here: https://discussions.apple.com/thread/6802848

  • Answers on Ask Different need to be more than just a link. It's okay to include a link, but please summarize or excerpt it in the answer. The idea is to make the answer stand alone.
    – nohillside
    Feb 16, 2015 at 6:24
  • This would probably work, but I'm not sure how comfortable I am dropping kernel extensions around. For now, forcing a 2.4 GHz network seems to be working. I'll come back to this if I encounter anything new.
    – Sourcerer
    Feb 17, 2015 at 2:56

Here is some troubleshooting you can do.

  1. Open Console and look if any messages there regarding WiFi.

  2. Hold "alt" key and click on the WiFi icon:

    2.1. Get Connection information like Radio signal RSSI, the connection mode 802.11?, the Transmit rate and the MCS Index.

    2.2. Scroll down and open Wireless Diagnostics tool

    2.2.1 Open and Run Network Diagnostics.

  3. Open Terminal

    3.1 run lsof -i -P to see who is using the WiFi connection


  • Wireless Diagnostics occasionally reports, "Your Wi-Fi connection appears to be working as expected", even though I can't actually connect to anything. Other times, it goes ahead and generates a report, reporting "LAN Connectivity Failure". PHY Mode: 802.11ac; Tx Rate: 7 Mbps; RSSI: -69 dBm; Noise: -95 dBm. From lsof -i -P, commands include: UserEvent, SystemUIS, sharingd, GitHub, WiFiAgent, com.apple, Google, BetterTou, Google, Wireless. Network Diagnostics is "unable to diagnose" the source of the problem.
    – Sourcerer
    Feb 14, 2015 at 16:58
  • See above for discussion that WPA2 may be the culprit.
    – Sourcerer
    Feb 14, 2015 at 17:01

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