Wifi sudden loss of connection

hi my wifi suddenly stopped connecting to my router and now it wont connect again it sees all the networks and connects to some but not my router what do i do

Someone with a similar problem, and his resolution:
http://log.does-not-exist.org/archives/2008/01/23/2164macbook_wirelesswoes.html

Similar Messages

Sudden loss of connection all together

I'll start off by saying hello to everyone.
We've had infinity installed for some time now. I'm talking many months, definitely more than 18. This is the first time we have encountered a sudden loss of internet connection. We have already called BT and followed all their steps but what the people at the call centre don't understand is we want to know WHY! Not the possibilities, a solid reason. I was always able to give this to our business customers when I worked first line support. We recently had a storm which I think is contributing, since going over everything many times and no joy I have wondered about the phone line. Since the loss of connection it has always got massive static interference on the line. The service updates say all is good, but I can't help but think that page is just nonsense and that it is at fault and that BT are too up themselves to admit the fault is their end.
Can anyone shed some light on this for me?
Thank you very much in advance.

Is anything shown here. http://usertools.plus.net/exchanges/mso.php
http://usertools.plus.net/exchanges/?
http://btbusiness.custhelp.com/app/service_status
http://bt.custhelp.com/app/answers/detail/a_id/15036
http://community.plus.net/exchange-information/
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Safari of my Macbook (on WiFi) suddenly fails to connect to the Internet. A popup window message says another device on the network is using my computer's IP address.

But then there was still no Internet access even after I have disconnected all other home computers (a total of four including the Macbook and one iMac desktop. For simplicity, I shall categorically called them Mac hereafter unless otherwise specified. The Macs are operating on WiFi.).
The window message recommends changing the IP of either the Macs or the other device. The latter of course does not apply because I don't think the other device is one of my computers.
My questions:
(1) Why did that happen suddenly since the Mac and other computers on the WiFi was working fine in the morning (as well as days before) and then all of a sudden an unknown device is using my computer's IP? As far as I (we) can remember, we did not do any thing unusual this morning nor had we downloaded any special programs.
(2) How do I change the IP since it requires Internet acess to do it and since I can't access the Internet on the Mac?
(3) I am almost sure the problem is not caused by the Internet service because when I connected the Ethernet cable from the DSL modem to an old Windows PC, I got Internet via Internet Explorer. [I am actually sending out this message via IE on my PC.] However, when I cennected the Ethernet line from the modem to a WiFi router (Airport Extreme) and then connect the router and the old PC, I did not get Internet on either the Mac nor the PC. Similarly, there was no Internet on both Mac and PC If I connect Ethernet only between the modem and the router but not between PC and router. So, the question is whether a third unknown party has gotten hold of my Mac IP address and is trying to break into the Mac? Can it steal my personal info?
(4) How can I repair the Mac now and prevent future recurrences? Is changing the IP address the way to do it? (But like I said before I had tried but could not change the IP because I did not have Internet access on the Mac. Is there an alternative method?)
(5) I wonder if a computer's IP address remains constant if you don't change it. The reason I am asking this question is because the aforesaid window message on the Macbook--not sure about the iMac--shows a different IP address--a few numerical digits were changed--almost every time it pops up following every failure trial of mine to access the Internet. Was the Macbook trying to change the IP for me or was there some thing not right?

Re: Another device on the network is using your computer's IP address.
This message/problem was occuring intermittently for me in a household with two MacBooks accessing one Airport extreme. Rebooting the modem and router would only temporarily fix the issue for me, so I spoke with a friend who works for Apple and it seems that the Airport Extreme settings were at the root of our particular issue.
The router(Airport Extreme) recieves only one IP address from the modem and in order to allow it to share the IP address with two computers at once, the solution in my case was through:
Applications>Utilities>Airport Utility>Manual Setup>Internet
under Internet Connection- Select "share a public IP address"
under NAT, check the box for "enable NAT Port Mapping Protocol"
(this will allow the sharing of one public IP address with multiple devices)
if this is a new setting, then click "Update" and the Airport Extreme should reboot itself with new settings applied.
When all else is working properly, this is a satisfactory solution in my case.

A sudden loss of connectivity...

Since February of 2008 I have had my network configured to allow me to send large files from work to home via DAV, DAVS, SFTP, FTPS and FTP (I enjoy tinkering with my set up). About a month ago everything came to an abrupt end and I have not been able to get it up and unning again, so here I am, hoping there will be some insight from you. My set up is as follows:
I use a DynDns URL (epconnect.dyndns.org) which correctly resolves to 98.224.193.135 to keep connected. If you want to try to check the connecions I have a test folder set up for FTP for user: test / Password: 20test09 and a folder set up or DAV using directory: DAVTest / user: test / Password: 20test09. I will watch for activity on these folders and keep them open for a month or so.
COMPUTERS I USED AS SERVERS IN TESTS:
Macintosh 01 - OS X 10.5.6 / Static IP 192.168.1.136 / PPC
Macintosh 02 - OS X 10.5.6 / Static IP 192.168.1.137 / Intel
ROUTERS I USED IN TESTS:
Linksys WRT54G 01 V. 6 - Firmware V. 1.02.6
Linksys WRT54G 02 V. 6 - Firmware V. 1.02.5
General network settings - Subnet 255.255.255.0 / Router address 192.168.1.1 / Apache 2.2.9 / httpd.conf file altered to allow WebDav / Web sharing enabled / File Sharing (FTP) enabled
All of the following tests were run both with and without the Macintosh firewall enabled, the results were the same in each case.
Tested http://localhost on Macintosh (01 and 02) in browser * - CONNECTED
Tested IP http://192.168.1.(136 and 137) in browser * - CONNECTED
Tested IP http://98.224.193.135 in browser * - FAILED
Tested IP http://epconnect.dyndns.org in browser * - FAILED
Tested IP ftp://192.168.1.(136 and 137) in browser * - CONNECTED
Tested IP ftp://98.224.193.135 in browser * - FAILED
Tested IP ftp://epconnect.dyndns.org in browser * - FAILED
Tested FTP for 192.168.1.(136 and 137) in CyberDuck ** - CONNECTED
Tested FTP for 98.224.193.135 in CyberDuck ** - FAILED
Tested FTP for epconnect.dyndns.org in CyberDuck ** - FAILED
Tested DAV for 192.168.1.(136 and 137) in CyberDuck ** - CONNECTED
Tested DAV for 98.224.193.135 in CyberDuck ** - FAILED
Tested DAV for epconnect.dyndns.org in CyberDuck ** - FAILED
At one point, just to test my router port forwarding, I enabled DMZ and forwarded ALL ports to 192.168.1.136 and 192.168.1.137 respectively but there was no difference in the results from the individual port forwards.
The Ping tests run on 192.168.1.136, 192.168.1.137, 98.224.193.135, and epconnect.dyndns.org all connected with no packet loss BUT in one case I forgot and had the ports forwarded to the Mac that I had TURNED OFF but still received a PASS! ***? I am guessing that Ping is worthless as a test to see if the site is responding because of this.
I ran a port scan from the DynDns.com Open Port Tool and all of the ports returned as OPEN using both epconnect.dyndns.org and 98.224.193.135. However I used the Macintosh utility Network Tool and ran a port scan from 21 to 443 (the only ones I need) for both epconnect.dyndns.org and 98.224.193.135 and both of the tests timed out returning NO OPEN PORTS.
I reset the Comcast Cable Modem (Arris TM502G/CT) with the CAT5 cable, the power cord, and the coaxial cable disconnected by pressing and holding the reset button on the modem for 20 seconds, waiting for all of the lights to come back on, then reattaching the router (NO CHANGE).
In desperation I reinstalled OS X on Macintosh 01 from scratch and reconfigured all of my settings but I STILL cannot get epconnect.dyndns.org to connect to FTP, SFTP, FTPS, DAV, or DAVS. Not even my test homepage will come up in the browser.
The following is an excerpt from Comcast:
I understand you have questions about which ports are blocked on the
Comcast network. I have included the current list of blocked ports for
you below:
67
68
135
137
138
139
445
512
520
1080
I am unsure what I could be missing. I spoke to Comcast a few minutes ago and they state again that they are not blocking th ports and there have been no changes in my service that could account or this. I also sent an email to DynDns.com and nothing is wrong on their end. I can't recall anything I changed on my Macs except for any recent upgrades from apple and I reset the routers back to factory spec and reentered all of the port routing by hand.
* Tested in browsers IE 7 and Safari 4 with a Dell PC and Firefox 3 and Safari 4 on a Macintosh.
** Tested FTP and DAV connectivity with EngInSite DataFreeway 2 on the PC and Cyberduck 3 on the Macintosh.
* I didn't bother testing FTPS or DAVS since the self signed certificate I use is for epconnect.dyndns.org and wont work on the local network.

Bump.
Any ideas?
This is a particular problem with users based in distant territories, e.g. South Africa. Our FMS is based in the UK.
I would imagine the number of hops in the connection is a big factor in this. Are there recommended FMS settings for this kind of scenario?
Ajay

Home hub 3 - Sudden loss of connection after havin...

I have been with BT for about a week now and over the last 6 days the internet has been working fine. Today I had to do some eletrical work so cut the power to the whole house, obviously this turned off the router. I did this on several occisions not really thinking as there was a few jobs that needed the eletricity being cut.
Since doing this I have had bad connection problems, the internet seems to work fine for about 10 mins then cut off for a minute them come back on again. I have done a full master reset but it still losses connectivtiy.
It could be that the line is dodgy but it seems weird that it was working completely fine and now it isnt. Rang up bt who are now monitoring the line for 24h. These are the adsl stats are below if that helps. If anyone has any suggestions on fixing the problem or the cause please let me know!
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
12.0 dB / 18.0 dB
Line attenuation (Down/Up):
50.3 dB / 30.0 dB
Output power (Down/Up):
17.5 dBm / 11.9 dBm
FEC Events (Down/Up):
4 / 0
CRC Events (Down/Up):
2 / 5
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
3 / 0
Error Seconds (Local/Remote):
1213 / 239

Is there anyway to tell bt that the line isnt unstable but it was infact me being stupid and turning it off?
Currenlty the stats are as shown. The nosie margin still very high and the downstreem very low. I am hoping this will change over the next few days. I am still losing connection however, have left the router doing its own thing and just using the internet when it allows me!
Connection Information
Line state:
Connected
Connection time:
0 days, 00:36:43
Downstream:
160 Kbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
15.4 dB / 18.0 dB
Line attenuation (Down/Up):
52.1 dB / 31.5 dB
Output power (Down/Up):
13.3 dBm / 11.9 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
1 / 5
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
0 / 0
Error Seconds (Local/Remote):
1 / 1

Sudden/intermittent lost connectivity

I just got a new ibook with an Airport Extreme card. My router is Linksys. Twice now, I've had sudden loss of connectivity, and the only thing that restores it is restarting the computer. (Renewing the DHCP lease may also work.) I have NEVER had this before -- on my old ibook, I had an old (non-extreme) Airport Card, with the same router. I DID upgrade to Airport 4.2 on the old computer, and did not experience any problems. Any thoughts?

From your other post, start broadcasting your SSID and see if that makes a difference.
iFelix, "General questions" #1, 02:43am Aug 21, 2005 CDT

My iPad Mini with retina display suddenly will not connect to the Internet. It shows full wifi bars, yet no web pages will load. My Internet is working with all other apple devices in my house. The iPad also no longer works with celluar data.

My iPad Mini with retina display suddenly will not connect to the Internet. It shows full wifi bars, yet no web pages will load. My Internet is working with all other apple devices in my house. The iPad also no longer works with celluar data. I'm not sure what has happened. It was working fine a few hours ago. I have tried resetting it, ive restarted my browser etc. I tried to erase all data from my Ipad but I can't do that because it needs to sign into my Apple ID and use the Internet!

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 drooping 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
6. Potential Quick Fixes When Your iPad Won’t Connect to Your Wifi Network
http://ipadinsight.com/ipad-tips-tricks/potential-quick-fixes-when-your-ipad-won t-connect-to-your-wifi-network/
~~~~~~~~~~~~~~~~~~~~~~~~~
Fix WiFi Issue for iOS 7
http://ipadnerds.com/fix-wifi-issue-ios-7/
iOS 6 Wifi Problems/Fixes
Wi-Fi Fix for iOS 6
https://discussions.apple.com/thread/4823738?tstart=240
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/
~~~~~~~~~~~~~~~~~~~~~~~
iPad: Issues connecting to Wi-Fi networks
http://support.apple.com/kb/ts3304
How to Boost Your Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Boost-Your-Wi-Fi-Signal.h Mt
Troubleshooting a Weak Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/Troubleshooting-A-Weak-Wi-Fi-Sig nal.htm
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
10 Ways to Boost Your Wireless Signal
http://www.pcmag.com/article2/0,2817,2372811,00.asp
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.
Some Wi-Fi losses may stem from a problematic interaction between Wi-Fi and cellular data connections. Numerous users have found that turning off Cellular Data in Settings gets their Wi-Fi working again.
You may have many apps open which can possibly cause the slowdown and possibly the loss of wifi. In iOS 4-6 double tap your Home button & at the bottom of the screen you will see the icons of all open apps. Close those you are not using by pressing on an icon until all icons wiggle - then tap the minus sign. For iOS 7 users, there’s an easy way to see which apps are open in order to close them. By double-tapping the home button on your iPhone or iPad, the new multitasking feature in iOS 7 shows full page previews of all your open apps. Simply scroll horizontally to see all your apps, and close the apps with a simple flick towards the top of the screen.
Wi-Fi or Bluetooth settings grayed out or dim
http://support.apple.com/kb/TS1559
~~~~~~~~~~~~~~~
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 iMac suddenly no longer connects to wifi network when in KIOSK (username) mode, and only connects when as ADMINISTRATOR mode. Its strange because the iMac has been working fine in KIOSK mode for over a year until 2 days ago.

My iMac suddenly no longer connects to wifi network when in KIOSK (username) mode, and only connects when as ADMINISTRATOR mode. Its strange because the iMac has been working fine in KIOSK mode for over a year until 2 days ago.

One of the memory cards was indeed faulty, and the other completely fine
Thanks very much for all your help!
Although there is one little thing that I've noticed. The iMac works properly, but I tried to software update to see if that may help my Minecraft sound issue (as I still don't think only having 2GB instead of 4GB would cause such a problem) but the software update application won't work. Running the "Software Update" from the apple menu on the toolbar gains no response, nothing happens. If I run the software update from system preferences, the application icon appears for a second, then disappears (as in the blank app. icon, the blank canvas with the pencil, pen and ruler in the bottom right corner). It does this every time I try to run it. It did work when the computer was crashing, but this started when on one of the occasions I ran the app. while it was crashing. Since this occured during the crashes, and still occurs now, I'm wondering did something simlar happen minecraft, as it's sound disappeared during the crashes and is still gone now.
However, the computer is now working again without crashes, which is the main thing, thanks for helping me fix the issue
Edit: I would mark the topic as solved, but I'm unsure if this would lock the topic or something simlar, so I'd rather leave it open for any ideas regarding the software update and Minecraft issues I'm having

Mac osx. Wifi suddenly gone and I can't turn it on again. Bluetooth connection to my iPhone has also gone.

Mac osx. Wifi suddenly gone and I can't turn it on again. Bluetooth connection to my iPhone has also gone.

Try getting a diagnostic check
System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport and/or Ethernet
Click the Assist Me button
In the popup window click the Diagnostic button.

My ipad mini suddenly won't connect to wifi

My iPad mini is 2 years old. Today it won't connect to the wifi at all. I've tried shutting it off and turning it back on. Then I go to wifi settings, and it shows my network and asks for password. I know I'm entering the password correctly, but it says *incorrect password*. I've tried resetting the ipad, I've tried resetting the network, I've tried closing out all apps, turning the ipad off and on, etc. My laptop is connected and my smart phone is connected, so that's not the issue. I don't know why the ipad is telling me the password is incorrect! What can I do? Any help would be appreciated!
PS - I have a brand new iPad mini here for my son for Christmas. I'd rather not have to give it to him today but I'm about ready to!

As of yesterday I have the same issue with an iPad Mini bought in November 2012. I have tried resetting the network settings - no good. I have done an entire factory reset - no good. I have restored from previous backups - no good. I have reset to factory and set up as a new iPad - temporarily OK, then added some apps back - no wifi again.
Today I have been to an Apple Store who could connect the iPad to their wifi OK, came home, connected OK for a few minutes and then back to no wifi again.
It is not the router that is the problem, in the house are iPhone 6 plus, iPhone 6, iPhone 5S, iPad Air, Macbook Air, Apple TVs, and other bits of kit that are all successfully connecting. All iOS devices are on 8.1.2.
This problem has effectively bricked my iPad mini... very not happy!!!

Sudden Loss of Internet Connection to Airport

I am having a similar problem to Fred55 (four posts down). My computer however, before it "fixes" the problem of accessing the airport says,
"An application named airport needs to access your keychain but there is an existing version. Do you want to change all your keychain items to allow the new version access to your keychain?"
-It then gives me the options Don't Change or Change.
So far, I have always said Don't Change, and then clicked on Allow Always, but then it seems to go back to the same loss of connection if I turn my computer off. I have looked at where it would change to, and it shows this:
System/Library/Private Frameworks/Apple80211.framework/VersionsA/Resources/airport. The difference being that the new version that the computer wants me to change to has versionA in it.
If you havent noticed I am not Mac saavy and could use some help. Should I instead of clicking Dont Change click the Change and let it move all the keychains to this VersionA business? Thanks for your input.

mulrich, Welcome to the discussion area!
Should I instead of clicking Dont Change click the Change...
Yes

Macbook Pro suddenly will not connect to the internet via ethernet cable.

I know this is a long shot... but I figured I would give it a try.
My macbook pro suddenly does not connect to the internet via ethernet cable. Please bear with me, as I am not very tech-savvy - I will try my best to describe the symptoms!
I connect to the internet via ethernet (we don't have wifi). It was working before I went to work, and when I came home I suddenly couldn't get anything to work (I know everyone says this, but I truly didn't mess with anything). Internet browsers just think for awhile and then turn up the 'You are not connected to the internet' error.
I went into my network preferences and curiously, the 'Ethernet' shows a green dot and says 'connected'. However it says 'Authentication server is not responding' underneath the last part that says '802.1X: WPA: eduroam' (I think that is my user profile).
When I go into my 'security' settings I can see that my firewall is off, so that shouldn't be causing any problems.
I've tried restarting the router and computer itself many times. Diagnostics just gets to a certain point and reports back 'Network Diagnostics cannot fix the current networking problems.' I've also tried switching to a different ethernet cable, and I tried both cables out on a PC laptop and it connected without issue. Additionally, I brought my macbook along to a friend's house and it connected to his wifi just fine, so the problem appears to just be with ethernet connections.
I know it's hard to troubleshoot this kind of thing without being there and having a look at the computer yourself, but any tips wouild be greatly appreciated.

As I mentioned above, I am not very tech savvy so I have no idea why a wireless protocol would be showing up there, I'm just listing everything I see in hopes that someone might know something I can try. This is why I am asking for help here - I'm not sure what has happened that has made me unable to connect, especially since it seemingly occured while nobody was using the computer.
I guess I should clarify that I'm not a total hillbilly- normally my firewall is set to 'on', but I set it to 'off' to try and troubleshoot the issues here as I was told that sometimes it can interfere with the computer's ability to connect to the internet. If this is not the case and firewall does not affect anything, I will turn it back on while I try to fix this.
I have tried the method you mentioned above a few times - I actually contacted my ISP earlier this week and they recommended resetting the router like that. They didn't mention any known network issues.

Wifi packet loss after upgrading to 10.7.4

After upgrading all three macs (mb pro, mb air, imac) in the house to 10.7.4 they all experience wifi packet loss. I ping to the local router. I have connected to a multitude of wireless routers with similar result.
But here is strong evidence that is a the OS X software problem. I am running linux inside of vmware fusion. I have run the exact same ping commands simultaneously in (1) mac and (2) vmware linux. The linux ping experiences zero packet loss, not even a single packet. The mac at its best will lose 1% packets, but can increase beyond that.
We are suffering from slow internet in our corrent location as it is, and this has a noticable impact on our performance. I am a bit afraid to upgrade to Mountain Lion for fear it may be even worse.
Any thoughts?

Your
com.apple.systempreferences.plist
file is likely corrupt in your
(use the Finder > Go > Go To folder and paste & Go)
~/Library/Preferences
folder, Trash the flle you can (may be two of them, one is a lock file) and reboot.
Reset your system preferences again.
Also see OnyX here: It has a plist checker for corruption
Step by Step to fix your Mac

IPad 3 Wifi "incorrect password," no connectivity

I bought two new iPad 3s. Both worked fine yesterday. Suddenly, one of them won't connect to wifi and says incorrect password (DEFINITELY correct). I also notice that suddenly I cannot connect to Safari or anything else with the use of my AT&T wireless account. Settings/Cellular Data/View Account, and it just spins the wheel, no connection. I tried Reset Network Settings. I restarted the ipad. I restarted the router. Has anybody figured this out?

I bought two new iPad 3s. Both worked fine yesterday. Suddenly, one of them won't connect to wifi and says incorrect password (DEFINITELY correct). I also notice that suddenly I cannot connect to Safari or anything else with the use of my AT&T wireless account. Settings/Cellular Data/View Account, and it just spins the wheel, no connection. I tried Reset Network Settings. I restarted the ipad. I restarted the router. Has anybody figured this out?

Why does my iPad2 suddenly keep losing connection on facetime?

Why does my iPad2 suddenly keep losing connection on FaceTime and tries to constantly reconnect?

Does it happen anywhere that you use FaceTime or only in your home WiFi network? If it happens with your home network, have you tried power cycling your router? Unplug it for about 30 seconds and then plug it back in.
Turn WiFi off and on in the settings. Reset the network settings.
Have you tried any troubleshooting steps at all?

Wifi sudden loss of connection

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