Dlink wifi dongle issue

Stops working suddenly. Ping says 'no route to host' in that case.
[ 4912.706872] usb 1-5: new high-speed USB device number 8 using ehci-pci
[ 4913.103466] usb 1-5: reset high-speed USB device number 8 using ehci-pci
[ 4913.580318] ieee80211 phy2: rt2x00_set_chip: Info - Chipset detected - rt: 2573, rf: 0002, rev: 000a
[ 4913.581063] ieee80211 phy2: Selected rate control algorithm 'minstrel_ht'
[ 4914.650153] systemd-udevd[2705]: renamed network interface wlan0 to wlp0s2f1u5
[ 4914.650803] ieee80211 phy2: rt2x00lib_request_firmware: Info - Loading firmware file 'rt73.bin'
[ 4914.650869] ieee80211 phy2: rt2x00lib_request_firmware: Info - Firmware detected - version: 1.7
[ 4914.731479] IPv6: ADDRCONF(NETDEV_UP): wlp0s2f1u5: link is not ready
[ 4924.461878] IPv6: ADDRCONF(NETDEV_UP): wlp0s2f1u5: link is not ready
[ 4924.539420] IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s2f1u5: link becomes ready
[ 4929.757760] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 4932.757328] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 4933.737187] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 4934.757062] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 4940.736182] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 4997.698192] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 5000.697763] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 5001.747614] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 5052.730449] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 5053.730322] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
[ 5054.700172] ieee80211 phy2: rt2x00usb_watchdog_tx_dma: Warning - TX queue 2 DMA timed out, invoke forced forced reset
enp0s7 no wireless extensions.
wwp0s2f1u9i1 no wireless extensions.
ppp0 no wireless extensions.
lo no wireless extensions.
wlp0s2f1u5 IEEE 802.11bg Mode:Master Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
I've googled problem, and it seems that some folks solved it with either reloading module with hwcrypt=0 or disabling power management.
I have no luck with first one, but every time I try to disable power management I'm getting:
~ » S iwconfig wlp0s2f1u5 power off
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlp0s2f1u5 ; Invalid argument.
~ »
It's looks like dongle working just fine on another OS.

Get used to those errors.
I've been using this same old bit of hardware for some time now with the same problems.
The problems started some time ago (early 2.6-ish?) when large parts of the Linux kernel's USB stack was re-written.
The rt2x00usb code was modified to cope with that and has been somewhat flaky since then.
There was some talk of it on the driver's mailing list, but it never really went much further than that partly because the developers were reportedly unable to reproduce the problem.
The mail archives are still available online if interested.
It reads as if the driver is still being maintained, but realistically it feels as if it's been put out to pasture as some ancient legacy hardware that no-one of programming importance finds useful anymore.
Sometimes a simple re-insertion of the device will resurrect it, otherwise a reboot is needed
Here are some ways to reproduce the errors:
* Plugging it into a USB1 port - must be plugged into a USB2 port
* Heavy prolonged network traffic
* Using the dongle extension base - works better plugged directly into the USB port and preferably with no other devices sharing the same USB hub
I've improved the frequency of the errors by using the following patch:
diff -urN a/drivers/net/wireless/rt2x00/rt2x00usb.h b/drivers/net/wireless/rt2x00/rt2x00usb.h
--- a/drivers/net/wireless/rt2x00/rt2x00usb.h 2014-10-06 05:53:04.000000000 +1030
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.h 2015-05-11 17:41:38.210035000 +0930
@@ -38,7 +38,7 @@
* however when loading firmware a higher value is
* required. In that case we use the REGISTER_TIMEOUT_FIRMWARE.
-#define REGISTER_TIMEOUT 500
+#define REGISTER_TIMEOUT 1000
#define REGISTER_TIMEOUT_FIRMWARE 1000
Hope some of that helps

Similar Messages

BT ac Wifi Dongle 900 starts service which uses hi...

I've just installed a brand new PC, with a fresh copy of Win7 Pro.
After installing the software off the BT page for the ac wifi dongle and plugging it in it operates correctly and I can connect to the internet, but upon plugging in the dongle a service called 'CppWindowsService' is started whih eats 50% CPU permanently even after a reboot!
Unplugging the dongle causes the service to stop, and plugging it back in again causes it to start up again.
I am absolutely sure this service is part of the dongle driver software. What can be done about this?
Thanks for your time.
Solved!
Go to Solution.

CaptainTingTang wrote:
erm, sorry but that seems like a workaround, not a solution. Has BT said what this service is or fixed it in a driver update?
Also, surely everyone who uses this dongle isnt wasting 50% CPU unless they manually delete a service?
As this is only a customer to customer forum, I am not aware of any action by BT at the moment. There only seems to be a few people reporting this issue. I assume that you have the latest drivers installed?
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

How do I use a USB WiFi dongle with a MacBook?

I recently acquired a USB wifi dongle and downloaded the appropriate driver. When plugged into my MacBook it will connect to my Graphite Airport base station. I can even use Airport Admin Utility to change setting in the Graphite ABS with this USB dongle.
The driver software also included a 'client utility' which I use to get the dongle to function with the MacBook. It also required adding the dongle to the list of network [ports via the Network Preferences in OS X.
But I do not know how to use it to access the internet through the ABS. My ABS has a 56kbps dialup modem in it which I use with the MacBook's internal WiFi card as my way of accessing the internet normally. I would like to know how to use this new USB wifi dongle to do the same thing though.
TIA

If you noticed on my jpg of my settings the very top left window shows that the MacBook thinks the dongle is indeed connected to the internet. In actuality the dongle is only connected to the Graphite ABS.
My thinking is that the Graphite ABS (Apples first ABS) is simply set up to listen to Apple's own Airport card when it comes to the ABS' internal 56k modem. Maybe someone can tell me from experience that a Graphite will listen to a USB wifi dongle?
A bit of my personal philosophy... Apple stuff generally 'just works'. It does not require a lot of windoze-like 'jumping thru hoops' to make it work. So when it does not 'just work' I tend to think that it is because it can't.
Didn't try turning off the firewall, but if it requires that I would not want to use it anyway.
Yes, the ABS does distribute IPs, or at least something does because they are different from one time to the next.
Access Control is on, but again, I require that so it would have to work that way for me or it would have no value to me.
Again I will say, I certainly appreciate your help BDAqua. But I am starting to think we may be trying to do something that cannot be done unless you know otherwise?
Again, I would like to ask, is there is anyone using a Graphite ABS with any USB wifi card/dongle?

How to use airplay with wifi dongle?

My mac's wifi adapter was broken, so I bought a wifi dongle - ASUS USB-N10.
It wasn't work until I installed the driver: http://www.wireless-driver.com/realtek-rtl8192su-adapter-macos-drivers-ver1082/
And however it seems to be a wifi assistant to help me using my wifi dongle more than a simple driver, and my mac recognize the wifi dongle as a lan connection, so I just cannot use airplay anymore!
The question is: how can I make my mac recognize the wifi dongle correctly (as a wifi)?

AirPlay is only compatible with AirPort base stations.
The dongle is not compatible with AirPlay.

HP Slate 21 Pro: WiFi connection issues

Hi,
I recently ordered two HP Slate 21 Pro devices. Unfortunately, both of them have WiFi connection issues. After some time the properly configured WiFi connection will be dropped, which results in connectionless devices. The WiFi AP is disabled after this, and so a timed reconnect will not succeed.
After inspecting the Logcat I found following lines:
12-05 08:56:58.939 V/EthernetStateTracker(675): report interface is up for eth0
12-05 08:56:58.939 I/EthernetStateTracker(675): interface up event, kick off connection request
12-05 08:56:58.939 I/EthernetStateTracker(675): interface up but ethernet is disabled, stop this interface
12-05 08:56:58.939 I/EthernetStateTracker(675): stop dhcp and interface
12-05 08:56:58.947 V/EthernetStateTracker(675): report interface is up for eth0
12-05 08:56:58.948 I/EthernetStateTracker(675): interface up event, kick off connection request
12-05 08:56:58.948 I/EthernetStateTracker(675): interface up but ethernet is disabled, stop this interface
12-05 08:56:58.954 I/EthernetStateTracker(675): report new state DISCONNECTED on dev eth0
12-05 08:56:58.954 V/EthernetStateTracker(675): update network state tracker
12-05 08:56:58.954 V/EthernetStateTracker(675): Ethernet is disabled, ignore state change event
12-05 08:56:59.080 D/ConnectivityService(675): ConnectivityChange for WIFI: DISCONNECTED/DISCONNECTED
12-05 08:56:59.080 D/ConnectivityService(675): Attempting to switch to BLUETOOTH_TETHER
12-05 08:56:59.080 V/EthernetStateTracker(675): reconnect +++
12-05 08:56:59.080 D/ConnectivityService(675): Attempting to switch to ETHERNET
12-05 08:56:59.094 D/ConnectivityService(675): resetConnections(wlan0, 3)
12-05 08:56:59.201 I/EthernetStateTracker(675): stop dhcp and interface
12-05 08:56:59.208 D/Nat464Xlat(675): requiresClat: netType=1, hasIPv4Address=false
12-05 08:56:59.208 D/ConnectivityService(675): handleInetConditionChange: no active default network - ignore
Especially this line:
12-05 08:56:59.080 D/ConnectivityService(675): ConnectivityChange for WIFI: DISCONNECTED/DISCONNECTED
Is this issue already known? Has someone a solution for me?
Thanks in advance,
Christian

That really shouldn't affect it.
I'm a little stumped because I haven't seen this issue with this device before. The only similar issue I found was this, and it's unresolved.
Have you tried doing a hard reboot of the Slate 21?
I work on behalf of HP (But this isn't my job)
Mark my post as “Accept as Solution" if you feel my post solved your issue, so that others with the same question can find the answer.
Please give me Kudos if I wrote something that helped you.

Wifi disconnect issue w new Mac

I bought a new Mac about a week ago. Right away I started experiencing wifi disconnect issues. I called customer support line and they had me reset the eprom. I don't recall the key sequence now. The problem went away for a week but has now returned. Is this a hardware quality issue?

right my friend, you know this is not an uncommon issue with mac, all my macs have the same issue (macbook, mac pro, mac mini and older imac), i disconnect the wifi and reconnect to sole the issue. it depends alot on what you have thats goign on around you, if there is a lot of wireless networks in your area then this might cause the issue. i improved this problem using a time machine and set the wireless to 5ghz only - it helped. i also bought an airport express to strengthen the network and touchwood this is a rare problem for me now!
try moving the modem around in case it this - ensure its not on the floor or touching the floor, there are many tips for improving modem connections look on youtube
however the sequence for this is on
http://support.apple.com/kb/HT1379

Internet Sharing via USB Wifi Dongle?

I just acquired a first gen Mini (1.25Ghz, 1GB RAM) with no Airport built in. I was able to add wireless to it via a Ralink 802.11n USB dongle. Here's my question:
Can I connect the Mini to the internet via ethernet and then use the USB dongle to share the connection with other Macs in my house?
I currently have an old PowerMac G4 acting as a server/wireless router. (Ethernet in to give it a real IP address for easy access from anywhere. Airport out to give internet access to my MacBook Pro.) It's a great setup, and serves me well (no pun intended), but if I could get the Mini to take its place, it would save me room.
Anyone know how to get one of these USB Wifi dongles to share out internets?
Thanks in advance for any thoughts.
SJ (no, not that SJ)

Can I connect the Mini to the internet via ethernet and then use the USB dongle to share the connection with other Macs in my house?
I don't have a USB wireless adapter, but I believe in order for this to work, you would have to be able to select it when attempting to configure Internet Sharing.
Does this USB adapter show up in the list of network devices under the Network panel in System Preferences? If it does, go to the Sharing panel. From this panel, select Internet Sharing; choose the USB adapter for the "Share your connection from" list, and then, choose "To computers using" = "Ethernet."

Apple TV or Sony Wifi Dongle for Sony Bravia TV??

Hi,
I have just recently bought a Sony Bravia 40" TV. To access the internet capabilities i need a Sony Wifi Dongle.
I already have a Macbook Pro and 2 iPhones that are used within the house on the wireless network. Was wondering if i should get the Sony Wifi Dongle or skip that and get Apple TV which is about the same price??
Any suggestions would be greatly appreciated!
Thanks
Andrew

I have a similar set up. However, before getting my ATV3, I had gotten a
ZyXEL 300 Mbps Wireless N Access Point, Ethernet Client, Universal Repeater, and Range Extender (WAP3205) to use as a wireless Ethernet bridge to my TV. It's about 1/2 the price of the ATV, but it is only a bridge--no subscription service, etc.
Having said that, the ATV is amazing! The only shortcoming is that it doesn't offer Hulu Plus service at this time. The upside is that you will be able to access services through your iPhone and mirror them to your TV through your ATV--and you can get app on your iPhone. (Lastly, you WILL eventually succumb and get the ATV.)
Hope that helps your decision.
(BTW, I did not hook the ZyXEL directly to my Sony Bravia, but to my Sony Blu-ray player.)
Message was edited by: JettaRed
Added comment re: hook-up to Blu-ray player.

Wifi Connection issue on iPad 3 when upgraded to iOS 8 onwards

Hi,
I am using iPad 3 from last one year. I didn't faced any issues with old versions of IOS. But after update my iPad OS to 8, I am facing Wifi Connectivity issue. Automatically Disconnecting Wifi when opened third party apps which need internet connectivity. I thought this may fixed in version 8.0.2 but not FIXED. And again I thought it may fixed in version 8.1 but not FIXED. This making too much headache. I want to go back to 7.1.2, Please help me in this issue.
Thanks,
Vijay

Hi,
I am using iPad 3 from last one year. I didn't faced any issues with old versions of IOS. But after update my iPad OS to 8, I am facing Wifi Connectivity issue. Automatically Disconnecting Wifi when opened third party apps which need internet connectivity. I thought this may fixed in version 8.0.2 but not FIXED. And again I thought it may fixed in version 8.1 but not FIXED. This making too much headache. I want to go back to 7.1.2, Please help me in this issue.
Thanks,
Vijay

Is there a fix for the wifi connectivity issue after ios6 update?

Is there a fix for the wifi connectivity issue after ios6 update?
Cannot connect to any wifi since update to 6.0.1
How do I get update to 6.0.2?
Will that even help?

Some things to try first:
1. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
3. Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
4. Go into your router security settings and change from WEP to WPA with AES.
5. Renew IP Address: (especially if you are droping internet connection)
    •    Launch Settings app
    •    Tap on Wi-Fi
    •    Tap on the blue arrow of the Wi-Fi network that you connect to from the list
    •    In the window that opens, tap on the Renew Lease button
~~~~~~~~~~~~~~~~~~~~~~~~~
iOS 6 Wifi Problems/Fixes
How To: Workaround iPad Wi-Fi Issues
http://www.theipadfan.com/workaround-ipad-wifi-issues/
Another Fix For iOS 6 WiFi Problems
http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
Wifi Doesn't Connect After Waking From Sleep - Sometimes increasing screen brightness prevents the failure to reconnect after waking from sleep. According to Apple, “If brightness is at lowest level, increase it by moving the slider to the right and set auto brightness to off.”
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
~~~~~~~~~~~~~~~~~~~~~~~
How to Fix a Poor Wi-Fi Signal on Your iPad
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Fix-A-Poor-Wi-Fi-Signal-O n-Your-iPad.htm
iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Connect iPad to Wi-Fi (with troubleshooting info)
http://thehowto.wikidot.com/wifi-connect-ipad
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

My wife has issues with her AOL email and was told to contact Apple about a virus scan. Has anyone else had a similar issue?

My wife has issues with her AOL email and a tech rep told her to contact Apple for a virus scan. Has anyone else had a problem like this?

You forgot to describe the 'issues' but there are no viruses that affect Apple OS X.
You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful:
https://discussions.apple.com/docs/DOC-2435
The User Tip (which you are welcome to print out and retain for future reference) seeks to offer some guidance on the main security threats and how to avoid them
Bear in mind that from April to December 2011 there were only 58 attempted security threats to the Mac - a mere fraction compared to Windows malware:
http://www.f-secure.com/weblog/archives/00002300.html
(I have ClamXav set to scan incoming emails, but nothing else.)

Drivers are not working for new BT wifi dongle

I just got BT infinity installed today. I also got the dual band AC wifi dongle 900 But it will not register on my PC. I tried installing the drivers for it but i noticed they are only for the 600 model. I know the Home hub 5 just came out along with the new dongle so is it just a case of waiting for drivers to be realesed?

Hi lightlamp,
I'm sorry about that, check out this link for the AC dongle drivers and let me know if you need any further help.
Cheers
Neil
BTCare Community Mod
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If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

WiFI N issue on iphone 4

hello
Lost of persons have constated a Wifi connection issue with iDevice on WiFi N mode. This problem involve connection lost or data connection lost event if the iphone already have an ip adress. I've tried in my wifi router different channels, 40 mhz bandiwth mode, 20 bandwith mhz mode. Iphone wifi connection work sometimes but it's a weak connection (good signal, ip adress still connected but no data transit between). So i have to switch the iphone to air mode and back to normal to retrieve a wifi connection working for 10min.
I can't send music via airplay to my airport express too. Air port detected, but send no music on it. Disable WiFi N mode to G mode work perfectly with airplay on AE. Wifi data working a well without any issues. The problem seems last iphone/ipad ios, because lots of poeples have these problem in many different brand wifi router. Some guys said there was no problem on previous iOs version (4.3?).
Hope this bug will be fixed in iOS5 to improve WiFi 802.11 N mode.
Cheer
Thierry

HHi I had the same issue my husband went back to using his iPhone 4, I have the iPhone 5 and a iPad and mini. I couldn't set the wifi on his iPhon,
This is what I did and what my be the issue everyone is having. The iPhone 4 works with a 2.4 ghz radio frequency all the new products work with a 5 ghz. If you change the frequency in your router the IPhone 4 will pick up your wifi. the only problem is that once you change it all your other pproducts will not pick up the wifi connection. I'm going to continue to change the frequency until they all work, will keep you up dated.

Lenovo G580 wifi connection issue

Hi,
My lenovo g 580 laptop wifi connection issue ....wifi connected some place ......some place not connected show in limited
access...but in that place connecting some other laptop but my laptop not connected show in limited access....
please help out getting this problem before 1 months please slove this any can help me out.....
Moderator comment: New thread created. Subject edited for clarity. Was: Re: Lenovo G580 boot from DVD.

Hi
''also re-verified all the setting with the dealer from were the phone was purchased and he said the setting are all correct but still it failed to work...''
The dealer hasen't provided a warranty?Take it for a check up.Your warranty should cover this.
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Worth buying a MBP right now?? (Are WiFi/router issues being addressed?)

I was planning to buy a new Macbook Pro, and then I began reading about all the wifi connection issues. Is Apple working on a fix for this? I am no techie and the thought of having to debug a router configuration so that I can get my MBP connected to the internet is not appealing. What is the status of this issues, as of Dec 29, 2008? (I plan to use my MBP downstairs via a wireless connection to my PC upstairs that is cabled into the wall and uses a cable modem. I'll buy the router for the PC when I purchase the MBP.) Thanks for any input!

If you look at various update description pages, you'll see Airport is addressed for certain reasons:
10.5.6:
Improves the reliability of AirPort connections, including improvements when roaming in large wireless networks with an Intel-based Mac.
10.5.4:
Addresses AirPort reliability issues with 5GHz networks.
Addresses AirPort issues that may result in slower performance in Logic Studio or MainStage.
10.5.3:
Improves 802.1X behavior and reliability.
Improves reliability when using Time Capsule.
10.5.2:
Improves connection reliability and stability
Includes 802.1X improvements.
Resolves certain kernel panics.
10.5.1:
Allows password-protected accounts on AirPort Disks to show up on in the Finder's Shared Sidebar.
Resolves an issue with saved passwords for wireless networks.
10.4.9:
Adds support for WPA2 encryption in Network Diagnostics.
Addresses an issue with automatic AirPort connections that use different authentication methods.
And then there are all these Airport downloads:
http://support.apple.com/downloads/#airport
Suffice it to say, Apple hasn't been standing still. One problem is, neither has the industry, and 802.11n is still a draft standard which no one company seems willing to settle on.
http://en.wikipedia.org/wiki/802.11n
Until everyone does, networking will be a constant cat and mouse game with wireless.

Dlink wifi dongle issue

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