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  • kolargol22 Level 1 Level 1 (0 points)

    Here is ultimate solution for those who use Macbook Air (2011) and 5Ghz band (TC or any other Airport). Recently u have had lot of "Disassociated due to inactivity" errors that forced me to dig into system and debug TimeCapsule (latest software). It turns out that MacBook Air have problem with DFS mode used on "a" or "n"(5Ghz) networks. I have iMac 21.5(2009) too - and it seems to handle DFS pretty well.

     

    Basicly when your network is operating on 5Ghz band with DFS enabled (default) when signal from ex. radar is detected station is forced to change channel - this is quite seemles on iMac - but Macbook Air seems to be stuck and it cannot switch channel fluently.

    Fix is very simple: disable DFS - run Airport Utility, select your router go to: manual setup->wireless->Radio Channel Selection->switch to manual->click Edit and select channels below 52 band for 5Ghz - and whatever for 2.4Ghz. Update and you're done.

     

    To verify that DFS is disabled - Alt+click on wifi icon in the menubar, it should say for example "Channel 36 (5Ghz)" - and no DFS acronym.

  • hennafromespoo Level 1 Level 1 (0 points)

    Right. My contribution follows. Sorry if this has been tested already. Quite early days for verifying this, but this sounds viable.

     

    I was going to wait for the fix as well (currently at Lion 10.7.2), but got bored waiting.

     

    Have been experiencing the same that the wifi seems to be dropping the internet connection (not the actual mac-router connection) after waking up from sleep. Additionally I noticed bad experience on some web sites like tabloids with heavy image content i.e. images weren't loading etc. After some waffling about, I logged in to the router and checked the logs. It was stating that there were some "flood" type events happening. Did some research on these and it appears that DoS type firewall setting in the router could be blocking the traffic from your computer to the host.

     

    Fine, maybe Apple has enhanced the driver to allow for more connections to be established by the OSX thus causing the router - though being outbound traffic - to feel that it is being attacked by someone or something nasty. The traffic is then blocked for some tens of seconds (default of 30 on my router). Once the connection is opened the OSX is still trying to establish these connections to the host causing another blockage. This may happen a few times causing the random length of problematic experience for people. Furthermore, after waking up from the sleep a computer probably attempts to update all sorts of feeds and browser tabs, thus entering this vicious circle from the start.

     

    The settings I changed that so far seem to have had a difference are:

    Firewall - Intrusion Detection - Maximum incomplete TCP/UDP sessions number from same host 10 -> 50

    Firewall - Intrusion Detection - Maximum half-open fragmentation packet number from same host 30 -> 100

    Firewall - Intrusion Detection - Incomplete TCP/UDP sessions detect sensitive time period 300 -> 800

     

    Due to lack of time I haven't researched what these variables mean in the context of intrusion detection and more specifically how it differs when using ethernet compared to wireless connection (perhaps the chipsets and software providing these settings).

  • William Kucharski Level 6 Level 6 (14,890 points)

    hennafromespoo wrote:

     

    Fine, maybe Apple has enhanced the driver to allow for more connections to be established by the OSX thus causing the router - though being outbound traffic - to feel that it is being attacked by someone or something nasty. The traffic is then blocked for some tens of seconds (default of 30 on my router). Once the connection is opened the OSX is still trying to establish these connections to the host causing another blockage. This may happen a few times causing the random length of problematic experience for people.

     

    This has been the case since Snow Leopard:

     

    https://discussions.apple.com/thread/2401315

     

    Safari 5 may be even more efficient about this.

  • Oxygen70 Level 1 Level 1 (0 points)

    My 2010 iMac 21.5" had the same issue. Here is a tutorial to fix that annoying problem that worked for me.

     

    http://www.youtube.com/watch?v=TtxRfFAh8Pg

  • JoeWillie2000 Level 1 Level 1 (0 points)

    Usually, the Wi-Fi is off and needs to be turned on. Simply go to Network (Preferences) and under your list of connectivity tools (Wi-Fi, Ethernet, etc.) you will see a "Light" icon with a down arrow next to it. Click that button and click "Make Service Active". You can also set service order, etc. I'm using a new MacBook Pro (purchased in the past month), and you need to configure your sleep settings to avoid having to repeatedly set things up.

  • galefromthousand oaks Level 1 Level 1 (0 points)

    I had this same problem except that I also could not connect at all via Ethernet. Been trying lots of suggestions on the forum but no solution. Finally gave in and called Apple Support.

     

    1) They had me restart while holding down the Option-Command-P-R keys (this resets the HW apparently. Didn't fix it.

    2) Next they had me move my System Preferences folder to the trash. Still didn't fix it.

    3) Lastly they had me move all my cache files to the trash and then empty the trash. Restarted and it seems to be fixed now.

     

    I was told that sometimes after an upgrade if you don't "delete all your caches" that there can be problems. I'll have to see if the connection holds up since before the problem was intermittent, but at least now I have a case number and all seems well so far.

     

    I encourage those who are experiencing issues to please call Apple Support - it appears that there is no one fix and it depends on so many different factors. If this issue re-appears I'll be back on the phone with them - plus I'll update this thread.

     

    Thanks!

  • galefromthousand oaks Level 1 Level 1 (0 points)

    Ten minutes after I wrote this - the problem came back again. I have a call scheduled with a Sr. Tech where they will most likely walk me through an "archive install" to re-install Lion. I'll post an update later.

  • Snoop Dogg Level 4 Level 4 (1,265 points)

    Gale, can you describe the exact problem you're experiencing?  The more detail you can give the better.

  • bangormaine Level 1 Level 1 (0 points)

    I have received a refund from Apple after they finally admitted they could not fix my problem with Lion dropping the internet connection every few minutes. The level one technical support guy said there is no big problem with Lion. I told him of numerous forums like this one and he again repeated that they did not see it as a major problem.

    They simply cannot fix mine. It would seem from the discussion on here that they cannot fix a lot more than mine.

    I am now happily back with Snow Leopard, but that was a major issue as I could not use Time Machine to back up after using Lion for a few weeks, however after 5 hours of work we managed to get it working again. Thanks to Apple Support but someone high up has to admit that there is a major fault with Lion.

  • William Kucharski Level 6 Level 6 (14,890 points)

    kolargol22 wrote:

     

    Here is ultimate solution for those who use Macbook Air (2011) and 5Ghz band (TC or any other Airport). Recently u have had lot of "Disassociated due to inactivity" errors that forced me to dig into system and debug TimeCapsule (latest software). It turns out that MacBook Air have problem with DFS mode used on "a" or "n"(5Ghz) networks. I have iMac 21.5(2009) too - and it seems to handle DFS pretty well.

     

    BTW, for anyone unfamiliar with DFS, a great description is available here:

     

    Dynamic Frequency Selection (DFS) When additional channels were added to the available 5GHz spectrum there was much concern on how Wi-Fi’s use of these channels may impact devices already operating in these ranges. To address this the 802.11h spec, commonly referred to as Dynamic Frequency Selection (DFS) was created to define a set of procedures to detect and avoid interference with Radar systems operating in the 5 GHz range (UNII channels – 52-64 & 100-140). Note that many people believe that DFS is only required for the extended UNII band, when in fact it also includes the upper 4 channels in UNII (52-64). There are several parts of the specification, however the one that is most visible to users is the ability of an AP to detect and move from a channel that interferes with radar systems. Basically AP’s supporting the standard will designate a ‘Quiet’ period using information in the Beacon frame. This information will tell the stations to set their Network Allocation Vector (NAV) to allow for a quiet period when the AP can listen for transmitting Radar. If radar is detected the AP must alter the channel it is operating on and most have the ability to tell associated stations what channel they will be moving to. This allows stations to re-associate with minimum interruption. APs that do not support DFS are not allowed to operate on the channels where interference occurs; this significantly limits the number of channels available in the 5GHZ spectrum.

  • galefromthousand oaks Level 1 Level 1 (0 points)

    I could not connect via Ethernet at all. Wifi would connect, but the connection would quickly become so slow as to be non-existent. My son's standard account seemed to be unaffected, although I did see some dropped Wifi a couple of times.

     

    Over the past 3 days I have been working with Apple Support (which I highly recommend) and we have ended up (after many other steps) erasing the hard drive, reinstalling the OS and are now in the process of migrating data back from the Time Capsule. So far I have migrated the user accounts and everything is working fine, but we still have to do the applications etc.

     

    In my case it looks as though there was data from another app that was interfering with Lion (one suspect is NetNanny but could be something else). Lion just surfaced the problem. We may never know what caused it, but as we continue migrating piece-by-piece we may find it.

     

    I cannot stress enough that if you are having problems to call Apple Support. Thanks and I will keep posting until my issue is fully resolved.

  • TapioFromHelsinki Level 1 Level 1 (0 points)

    Exactly the same happened thing to me lately, uppgrading late 2008 MacBook pro from snowleopard to lion made my wifi connection very unstable. No problems with connection but it worked only a couple of minutes at a time. No  error messages, airport seemed to be working with no troubles, full signal strenght, but there was no data moving. Turn wifi of - turn wifi on solved the problem for a few minutes. My wifi router is a Telewell 515ae, otherwise working ok.

     

    Telephone call to mac support did not give me much help. I was advised to buy a new router, or if thar doesn't help, install mac os again. After some discussion I was advised to remove "system configuration" folder from system /libraries folder and reboot my mac. I was told that when uppgrading mac may keep some settings incompatible wit lion. I did this without no help.

     

    I noticed that a stable wifi connection could be made with my iphone, the authenthication protocol seemed to be WPA2 (I was not asked about any choises), and my router has been working with WPA personal. I changed my router settings to WPA2 authentication and since that there have been no wifi dropping of. I also renewed my wifi settings in my macbook and the wifi connects now automatically when waking from sleep /suspend situation and there are no problems anymore.

  • joe619 Level 1 Level 1 (0 points)

    I went to a clients today who recently purchased a new 21.5" iMac.  When I removed the ethernet to use it in another computer, the wireless started dropping, then re-associating with their APPLE AIRPORT. 

     

    This is NOT a problem with the AP, as I have seen this same behavior with a brand new mac mini on my apple airport.  This has got to be a driver problem with Lion and new wireless network hardware. 

  • galefromthousand oaks Level 1 Level 1 (0 points)

    It looks like it was a problem with an application - can't tell which one but as soon as we migrated applications over the problem reappeared. I tried uninstalling apps one-by-one, but couldn't find the culprit. So I started over by erasing the HD, reinstalling the OS then migrating the users over again. Now I am using disks to methodically reinstall each app and run updates. So far so good, and I plan on paring down to the essentials and being vigilant on what gets installed etc.

  • mazstar Level 1 Level 1 (5 points)

    Could someone please help me with sorting out my iMac wifi on Lion 10.7.2. Everything seems to have been sorted on my Macbook Air but my iMac drops wifi connection when there is a period of inactivity.

     

    I have to keep turning it off and on again.

     

    Makes me think there is some settings on my iMac that need to be tweaked but not sure what.

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