Imac 10.7.5 drops all network connections

I am using an iMac 10.7.5 that has started to drop the network connection (both ethernet and wireless). Using in a corporate environment on a Cisco switch. No other computers on this switch losing their connections. Have an Mac Book Pro that can connect on the same switch without a problem. I have deleted preferences and restarted but it still drops. Will last about 30 minutes then it drops. The only way to restore it is to restart. Have repaired permissions ad nauseum. Tried booting to recovery (Command-R on startup) but it just goes to my login screen. Trying not to reinstall OS but may have to. Any other suggestions?

There are 9 different versions of iPhoto and they run on 9 different versions of the Operating System. The tricks and tips for dealing with issues vary depending on the version of iPhoto and the version of the OS. So to get help you need to give as much information as you can. Include things like:
- What version of iPhoto.
- What version of the Operating System.
- Details. As full a description of the problem as you can. For example, if you have a problem with exporting, then explain by describing how you are trying to export, and so on.
- History: Is this going on long? Has anything been installed or deleted? - Are there error messages?
- What steps have you tried already to solve the issue.
- Anything unusual about your set up? Or how you use iPhoto?
Anything else you can think of that might help someone understand the problem you have.

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AP541N-E-K9 keeps dropping all WLAN connections

I hope someone could shed some light on an issue we have with our AP541N-E-K9 on the latest firmware.
Our issue sounds similar to this thread:
https://supportforums.cisco.com/thread/2028334
Our AP541N-E-K9 keeps dropping all WLAN connections and will not allow us to connect via WIFI. I have to switch the unit off and on but even so sometimes it will take 10 mins for the WLAN to accept new connections. Nothing has changed on the network for months as it is a very basic scenario ie Draytek DSL Router -> Cat5e cable -> AP541N-E-K9, thats it! The AP is really only used for guest access and may have about 15 staff connected via WIFI at any one time.
Thanks

Hi Alena,
I've changed the access point to use channel 1 which seemed to work for about 5 mins and then all wireless devices have dropped off and the even log keeps showing:
Apr 30 16:39:09 info hostapd wlan0: IEEE 802.11 STA 40:30:04:4b:e4:1e deauthed from BSSID 64:ae:0c:ea:ca:40 reason 3
Apr 30 16:39:09 info hostapd wlan0: IEEE 802.11 STA 14:74:11:76:97:24 deauthed from BSSID 64:ae:0c:ea:ca:40 reason 1
Apr 30 16:39:09 info hostapd wlan0: STA 14:74:11:76:97:24 WPA: pairwise key handshake timed out (no reply was received for the first message)
Apr 30 16:39:09 info hostapd The wireless client with MAC address 14:74:11:76:97:24 had an authentication failure.
Apr 30 16:39:09 info hostapd wlan0: IEEE 802.11 STA 40:30:04:4b:e4:1e deauthed from BSSID 64:ae:0c:ea:ca:40 reason 1
Apr 30 16:39:09 info hostapd wlan0: STA 40:30:04:4b:e4:1e WPA: pairwise key handshake timed out (no reply was received for the first message)
Apr 30 16:39:09 info hostapd The wireless client with MAC address 40:30:04:4b:e4:1e had an authentication failure.
Apr 30 16:39:02 info hostapd wlan0: IEEE 802.11 Assoc request from 70:d4:f2:1a:ec:3d BSSID 64:ae:0c:ea:ca:40 SSID Skyfire
Apr 30 16:39:02 info hostapd wlan0: IEEE 802.11 STA 70:d4:f2:1a:ec:3d deauthed from BSSID 64:ae:0c:ea:ca:40 reason 3
Apr 30 16:39:02 info hostapd wlan0: IEEE 802.11 Assoc request from 70:d4:f2:1a:ec:3d BSSID 64:ae:0c:ea:ca:40 SSID Skyfire
Apr 30 16:39:02 info hostapd wlan0: IEEE 802.11 STA 14:74:11:76:97:24 associated with BSSID 64:ae:0c:ea:ca:40
Apr 30 16:39:02 info hostapd wlan0: IEEE 802.11 Assoc request from 14:74:11:76:97:24 BSSID 64:ae:0c:ea:ca:40 SSID Skyfire
Apr 30 16:39:02 info hostapd wlan0: IEEE 802.11 STA 14:74:11:76:97:24 deauthed from BSSID 64:ae:0c:ea:ca:40 reason 3
Apr 30 16:39:02 info hostapd wlan0: IEEE 802.11 STA 40:30:04:4b:e4:1e associated with BSSID 64:ae:0c:ea:ca:40
Apr 30 16:39:01 info hostapd wlan0: IEEE 802.11 Assoc request from 40:30:04:4b:e4:1e BSSID 64:ae:0c:ea:ca:40 SSID Skyfire
Apr 30 16:39:01 info hostapd wlan0: IEEE 802.11 STA 40:30:04:4b:e4:1e deauthed from BSSID 64:ae:0c:ea:ca:40 reason 3
Apr 30 16:39:01 info hostapd wlan0: IEEE 802.11 Assoc request from 40:30:04:4b:e4:1e BSSID 64:ae:0c:ea:ca:40 SSID Skyfire

Mac Mini *half* loses all network connections

Cheers folks, new one on me. I have a Mac Mini 2.26Ghz Core 2 Duo. It's running a fully-updated 10.6.8. It's connected via ethernet to an Airport Extreme which is extending an 802.11N network from another Airport Extreme elsewhere which is connected to the router. The network is set with IPv6 *off* and is configured to run over Ethernet normally (this is because a wired-only NAS is connected to the same Airport Extreme as the Mini).
Here's the symptom, and it's an odd one for me: Every couple of days, the entirety of the Mac OS X layer (not the BSD layer) will lose network connectivity. More specifically:
No web browser will work ('Not connected to the Internet').
Home Sharing, served on this Mini, will cease to be visible from elsewhere in the house (AppleTVs lose it).
No internal services can be reached by name, either DNS or BonJour.
The App Store says 'can't connect.'
iTunes will say it can't connect to the ITMS.
This is true on Ethernet *or* on Airport (the Mini usually runs on ethernet alone with AirPort off; bringing up Airport once this has occurred doesn't seem to help anything).
Running the Airport Utility, it sees *no devices* (there are 4 on this network)
BUT!
If I go into the Terminal, I can not only get clear network traffic anywhere I want at the TCP layer, DNS seems to work as well. So the following is true also:
'ping cisco.com' (or any valid DNS name) works fine - resolves DNS, pings.
'traceroute cisco.com' works fine - resolves DNS, traceroutes out across the internet, no problems.
'ping <IP address of NAS>' - works fine.
'dig <name>' - works fine.
pinging the gateway (the router airport) works fine.
Also:
Other Macs in the house (on wired OR wireless, connected to any of the AirPorts including the same one as the Mini) work fine.
Other Macs can see the NAS connected to that same AirPort fine.
iOS devices in the house connected to any AirPort work fine.
netstat -r shows what look to be proper routes - i.e. the default gateway is the router address (10.0.1.1) and the route to 10.0.1.1 is shown to be the MAC address of the router's Ethernet interface (anyway, as I mentioned above, network stuff from the shell works fine<!?!??!
Steps tried:
Turning off ipv6 - nope.
Applying all firmware/software updates (OS X 10.6.8) - nope.
Tried manually setting DNS to Google public DNS servers - nope. Those work fine, and are still set when the network drops out, and then don't work, nor does setting new DNS servers in the Network prefpane.
Logging out/back in - nope.
Restarting the computer: YES. This works, all three times this has happened (all this week). Serious PITA.
I tried going through the system log, but I don't see anything notable that changes or is logged when the network connection drops.
Every time the connection has stopped working, the computer *has* slept at some point since it was last known working, but if I sleep the computer manually, everything seems fine.
.....waaaaaaaah! Help, this one is making me crazy. :-) Thanks. I'm terminal-savvy, and fairly OS X savvy.

I still have this issue. About every one hour - two days the DNS layer will stop working and only a restart will fix it.
Killing mDNSResponder only resolves the issue sometimes and even then for a few seconds.
I have now found and created the following bash script, to see if this will be a more reliable non-restart fix that killing mDNSResponder in the terminal:
#!/bin/bash
#Script to unload and reload mDNS as it is a bit crappy
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
echo "mDNS unloaded"
sleep 5
sudo launchctl load /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
echo "mDNS loaded"
sleep 5
echo "Hopefully you can get on with browsing again"
I saved the above as mdns_reload.command, and then in Terminal ran "chmod u+x mdns_reload.command". This makes the script executable.
The next time the problem occurs I am going to test how good this script is as a resolution.
The second time the problem occurs I am going to try the following, from a different thread from 2011:
I don't know if anyone will be helped by this, but the Macbook problems connecting to the internet are directly related to DNS issues. I discovered this after an upgrade to the OS X Lion preview.
The symptoms are as follows: a macbook (pro, mini, etc) can get an IP address from a DHCP server on any given network, but can not connect to the internet, even though other computers on the same network have no issues. If this sounds familiar, read on.
The problem is not related to 3rd party products, routers, Airport settings, locations or public vs private DNS servers, and you don't need to reset SMC or PRAM.
You will need to use terminal and you DO NOT want to use disk utility to repair permissions.
The most direct way to fix this is to copy the com.apple.mDNSResponder.plist and com.apple.mDNSResponderHelper.plist files from an internet connected Mac into your /System/Library/LaunchDaemons directory.
(You should know that it probably doesn't matter what version of OS X you have or the other Mac has, you just need the files.)
Next you will need to change ownership of the files just copied (ex: chown root:wheel /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist and chown root:wheel /System/Library/LaunchDaemons/com.apple.mDNSResponderHelper.plist)
Then, you will need to set correct permissions (ex: chmod -R 755 /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist and chmod -R 755 /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist)
The last thing you'll want to do is to verify that the ownership of the files copied is set to system (and maybe wheel) using "Get Info." (Conversely, you can use ls -l /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist to verify owner and permissions.)
You should not have to restart to connect immediately to the internet.

Jabber for Windows 9.1(3) - All network connections fail at least once a day

Hi,
We have Jabber for Windows 9.1(3) running, with the MSI 3.2 installed as well.
At least once a day my computer stops making network connections (Outlook gets disconnected, Internet Explorer cannot connect to Google, Chrome also fails). When I shut down and restart Jabber all network IO resumes.
Has anyone seen this behavior?
I've made two problem reports for this. Is anyone interested?
Regards,
Erik Tamminga
PS. Server side we're running all 9.1 versions.

We had the same issue and logged a TAC case, and the final result was to uninstall media services as mentioned above. Obviously now you no longer have desk phone video.
The new 9.2 beta has a new media service version, and the rollout of the new 9.2 client is mid march I believe, so hopefully this rectifies the problems, because if it doesn't I think this would not be a good thing for Jabber as a product unfortunately.
Cheers

BT HH5 Dropping All WiFi connections every few min...

Have been with BT for over a year with no problems with standard BT Broadband and the HH4
2 days ago I was upgraded to BT 'Faster' Broadband and an engineer updated my internal phone socket and I was upgraded to the HH5
Every few minutes it drops connections to all devices connected wirelessly (Android phone, tablet & Chromecast, 2 iPhones, 2 iPads and 2 Windows laptops) Have a PS4, Sky+HD box & Samsun TV connected via wired which don't seem to have problems.
With all the devices losing their connection regardless of manufacturer & my previous HH4 never having a problem, the WiFi connection problem obviously lies with the HH5
BT's troubleshooting is not fit for purpose as it all it does is talk you through getting connected wirelessly, which isn't a problem... staying connected longer than a few mins is.
Is it faulty, is there settings that need altering
Thanks in advance

have you tried giving the 5 ghz wireless a different SSID
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Network Utility - packet transfer despite all network connections set as Inactive

Within Network Utility...
Transfer Statistics - Why do the values for Sent & Received Packets continue to show an increase when all Network Services are set as Inactive?

That did it- thank you very much!
edit: not sure how to put [SOLVED] in the topic...
Last edited by o1911 (2009-05-15 08:36:39)

OsX 10.5.4 Drops PC Network connections after several hours

Recently update G5 to OSX 10.5.4 and find that our connection to the office pc network gets dropped after a few hours. Before it was fine. Not sure if problem is linked to the fact that we need to use the Go 'connect to server' in order to connect to our pc server. Once connected the shared connections on the left pane in finder are operable. I recall this is a reported bug.
Thanks for any suggestions

*UPDATE :*
Since I isolated the issue to just the Mac on the network, i thought it I should test if it affected all macs and OS versions.
Here are my conclusions:
Power Mac G5 running 10.5.8 -> Drops Connection after NTP Sync
Mac Book Pro running 10.6.4 -> Drops Connection after NTP Sync
Mac Book Pro running 10.6.4 (wireless) -> Drops Connection after NTP Sync
Any ideas ?
~D

My computer keeps dropping my network connection (or it times out), trying to figure out if it's a problem with my ISP or Base Station.

My computer keeps dropping off our in-house wireless network. I have called my ISP and they say everything on their end is fine. I'm trying to figure if there's a problem with my Base Station. The green light remains on at all times. On my cable modem, the light signaling "PC Activity" and all other appropriate lights are on. I often have to restart my Base Station which then allows me to connect for a short period of time before my computer drops off the network again. Our other associated devices around the house (iPhone, other PC, other Smart Phone) don't remain connected to the network as well.

Sporadic drop-offs of wireless clients typically indicates that there can be at least two primary causes: 1) The wireless router may be misconfigured or not functioning properly, and/or 2) There is a significant amount of Wi-Fi interference in the nearby area that is preventing the wireless router from providing a "clean" signal for wireless clients to maintain a connection.

WRT54G ver 6 router drops all existing connections when new computer joins

Hello,
I have a WRT54G version 6 Wireless router that operates fine with one exception. I generally connect to the router from one of three laptops in the house. If one laptop is connected, this existing connection drops as soon as another laptop connects to the router. The connections will automatically reconnect in a 10 seconds or so, but it dumps my VPN connection when it disconnects. I am tired of re-establishing the VPN connection everytime this happens.
Any idea why it is doing this? Better yet, how can I get it to stop?
two of the laptops use Windows XP, the third is Vista.
Thanks,
DM

I don't know exactly what is causing your problem, but clearly you are having some poor wireless connections.
The first thing to do would be to download and install the latest drivers for all of your computer's wireless adapters.
If you still have the problem, then try the following, more or less in order:
First of all, give your network a unique SSID. Do not use "linksys". If you are using "linksys" you may be trying to connect to your neighbor's router. Also set "SSID Broadcast" to "enabled". This will help your computer find and lock on to your router's signal.
Poor wireless connections are often caused by radio interference from other 2.4 GHz devices. This includes wireless phones, wireless baby monitors, microwave ovens, wireless mice and keyboards, wireless speakers, and your neighbor's wireless network. In rare cases, Bluetooth devices can interfere. Even some 5+ GHz phones also use the 2.4 Ghz band. Unplug these devices, and see if that corrects your problem.
In your router, try a different channel. There are 11 channels in the 2.4 GHz band. Usually channel 1, 6, or 11 works best. Check out your neighbors, and see what channel they are using. Because the channels overlap one another, try to stay at least +5 or -5 channels from your strongest neighbors. For example, if you have a strong neighbor on channel 9, try any channel 1 through 4.
Also, try to locate the router about 4 to 6 feet above the floor, in an open area. Do not locate it behind your monitor or near other computer equipment or speakers. The antenna should be vertical.
Also, in the computer, go to your wireless software, and go to "Preferred Networks" (sometimes called "Profiles" ). There are probably a few networks listed. Delete any network named "linksys". Also delete any network that you do not recognize, or that you no longer use. If your current network is not listed, enter its info (SSID, encryption (if any), and key (if any) ). Then select your current network and make it your default network, and set it to automatic login. You may need to go to "settings" to do this, or you may need to right click on your network and select "Properties" or "settings".
Some users have reported improved wireless connections by switching to WPA encryption.
If you continue to have problems, try the following:
For wireless g routers, try setting the "Transmission Rate" to 54 Mbps.
If you still have trouble, download and install the latest firmware for your router. After a firmware upgrade, you must reset the router to factory defaults, then setup the router again from scratch. If you saved a router configuration file, DO NOT use it.
Hope this helps.

IPhone drops wireless network connection

My iPhone can't keep a wireless connection. I can establish the connection as indicated by the wireless network icon, but within less than a minute it reverts to the 3G network icon.
I've tried numerous times to establish a persistent connection, to no avail. During one of those attempts I received an error message "could not scan for wireless networks." I haven't seen anyone else here get that message.
Any ideas what is going on?

I suggest resetting the network settings on your iPhone.
Go to Settings > Reset, and select Reset Network Settings.
This will erase all existing wi-fi network settings stored on your iPhone. This will require re-entering the password for a password protected wi-fi network and reconnecting to all wi-fi networks that you have access to.
If this doesn't work, try a reset, which is done by pressing and holding the Home button and the sleep/wake or on/off button simultaneously until you see the Apple logo and then release - ignoring the slide to turn off prompt when doing so. An iPhone reset does not affect any data or settings.
If no change after a reset, try restoring your iPhone with iTunes from your iPhone's backup - which is the default selection when doing a restore. If there is a problem with your iPhone's backup, restoring your iPhone from your iPhone's backup will restore the problem. The next step is a restore as a new iPhone or not from your iPhone's backup.
If no change after these steps and if you are in the U.S., time to give AppleCare a call at (800) 694-7466, or make an appointment at an Apple store if there is one nearby.

IMac (SL) keeps intermittent dropping of DNS connection

A number of times, I step away from my iMac only to come back and find its dropped its connection to my DNS servers (OpenDNS). My MacBook (still on 10.5.8) never does this.
Looking at console, this error comes up every 2 seconds:
21/11/2009 15:31:31 mDNSResponder[18] ERROR: mDNSPlatformTCPConnect - connect failed: socket 81: Error 13 (Permission denied)
Is this a known issues? Any fixe for this?
Thanks

I haven't had the problem since my upgrade to 10.5.6. Unfortunately, I'm having the same problem with my wife's iMac running Tiger. If we walk away for several minutes the internet connection is dropped. I was considering upgrading to Leopard (which is why I'm checking this forum), but now I'm not so sure.
We're both wireless. The issue isn't with the router. In fact, I replaced the router since the problem started.
I suspect there isn't a problem with a wired solution. However, the router is in a different room from my wife's machine. Is there any way to get a second router to place near the problem iMac to "catch" the signal from the first router, then hard wire it into the iMac? Not an elegant soluation, but perhaps it would work?

When downloading podcasts all network connections are used

Hi,
I have a problem when running iTunes 10.4 under OS X 10.6.8. If iTunes is downloading Podcasts, then all of the systems connections are used. I cannot browse using Safari to many but not all sites. I can resolve the address of the web page, but I cannot get there and get any data. If I quit iTunes all of the Safari pages load.
Anyone else see this?
OS X and iTunes are both patched to the latest.

Found an answer to my own question.
When a podcast is downloading, it makes as many connections to the Akamia network as Akamai allows to get the download faster. This has the problem of making pages in Safari that are hosted on Akamai data services to not load becasue you are already using all available traffic for the podcast. Either stop the podcast or go to pages that do not host on Akamai until the pdcast has completed.
You would think there was a way to throttle that.

My Verizon MI424WR router resets and drops all client connections without my intervention

I have noticed my devices lose their Verizon MI424WR router and Internet connection (wired and wireless alike) for some time now (months) on a regular basis. Sometimes multiple times a day and at different times of the day. You typically have to be actively using a device to notice these events. I have one client that will display an "Internet Connection Restored" message until I return to view it and I can see that this happens quite frequently overnight when there is minimal Internet usage. During a recent "outage" I quickly ran to the router to find it was in the process of rebooting, however, I did not perform any direct actions (e.g., cycling the power or applying admin config changes) that would have caused it.
What is/could be the cause of this? Is Verizon support pushing silent router maintenance updates that require resets? Am I exceeding the maximum TCP connections the firmware will allow before faulting to reboot? I require high availability and uninterrupted connections and would prefer to know the routers limitations or when any remote automated maintenance requiring resets will be occurring if that is in fact the cause.

My router routinely runs for months between resets, which are caused by me needing to move a cable or a similar. Only once did I notice a reset due to a Verizon update, and that was when the firmware was updated a year or so ago.
You can check the router's up time on the "system monitoring" web page. This will let you know when the last reset occurred.
You should not see resets unless you cause them. The symptoms you describe are not typical. You might need a new router. If you think so, contact Verizon support.
Good Luck.
If a forum member gives an answer you like, give them the Kudos they deserve. If a member gives you the answer to your question, mark the answer as Accepted Solution so others can see the solution to the problem.

Time Capsule keeps dropping network connection

I recently got a Time Capsule to replace a dead external drive and my AirPort Express. I was able to set up the Time Capsule as a router with little trouble but using it as a Time Machine backup drive is driving me crazy. Each time I start a backup the Time Capsule eventually drops my network connection before it can finish. I have about 200GB on my internal drive. Could this be too much to transfer over Wi-Fi?
I never experienced a dropped network connection when I was using the AirPort Express and my second Mac (a G4 iMac) never looses the connection. Any ideas what could be going on here?

Very interesting. Been working this problem from every angle. Noticed two kickers.
1) Transmission would refresh to fast when opening and closing menu bar airport icon.
2) Transmission never fades when running iStumbler which is continuously interrogating Time Capsule.
MacPro software seems to be forgetting that it is hooked up and drops out. It is a software thing.
I am starting iStumbler for each session automatically now and am having no drop outs. It is keeping Time Capsules attention. It is not required for all computers in the house but certainly is for the MacPro from which I control everything.
Amazing. Can one of the FanBoys bring this to the attention of the right person at Apple? Also, I need work and have many stories of trouble shooting successes. Tell them to hire me. It would save you guys a lot of time.

Network Connection Suddenly Drops Several Times Per Day

We have a couple of macs in our office whose network connections drop several times per day. The two main ones are both 1.66 GHz Intel Core Duo Mac Mini's — one running OS 10.4.8 and the other 10.4.9. Our server is a Windows
Server 2003 Pentium 4, 3 GHz computer and we use a Linksys 24 port 10/100 Ethernet switch. On occasion, someone else's mac drop their network connection but it seems to be much more frequent with these two. Our other macs are a mixture of other Mac Mini's, iMacs, G4's, etc. all running either OS 10.4.8 or 10.4.9.
Any ideas??????
Thanks,
Neil Brown
iMac 2 GHz Intel Core 2 Duo Mac OS X (10.4.8)

The network connection is still dropping with switching around. In addition, starting this morning, my network connections as well as another person's are dropping suddenly too. The only pattern I can see with mine so far is it seems if I am away from my computer for a few minutes and come back, my network connection has dropped (i.e. the individual "shares" that I have mounted on my desktop, so I have to go back to Connect to Server, log in and mount those again). Our ethernet switch is new, and we had been experiencing this problem before with our old switch, so that didn't solve the problem.
I'm not sure what to try next. Any suggestions?
Thanks,
Neil
iMac 2 GHz Intel Core 2 Duo Mac OS X (10.4.8)
PowerMac G4

Imac 10.7.5 drops all network connections

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