Internet freezes then network connections drop?

New iMac with OS 10.7.2 Lion, I am experiencing frequent internet freezes and then all my network connections drop and I have to reboot the machine
to continue working. It works fine for awhile then same thing! Anyone else having this issue? I am not using Wifi, we are using ethernet connection through a network. All of our other macs and pc's have no issues at all so it leads me to believe its the new Mac?

William, here's what I get.
Dec 12 09:13:15 Ricks-iMac crashdump[1554]: smbd crashed
Dec 12 09:13:15 Ricks-iMac crashdump[1554]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:13:20 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:13:21 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:13:23 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:13:27 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:13:35 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:13:38 Ricks-iMac crashdump[1561]: smbd crashed
Dec 12 09:13:38 Ricks-iMac crashdump[1561]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:13:51 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:14:29 Ricks-iMac crashdump[1568]: smbd crashed
Dec 12 09:14:29 Ricks-iMac crashdump[1568]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:16:14 Ricks-iMac crashdump[1582]: smbd crashed
Dec 12 09:16:14 Ricks-iMac crashdump[1582]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:16:35 Ricks-iMac crashdump[1588]: smbd crashed
Dec 12 09:16:35 Ricks-iMac crashdump[1588]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:17:26 Ricks-iMac crashdump[1597]: smbd crashed
Dec 12 09:17:27 Ricks-iMac crashdump[1597]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:18:34 Ricks-iMac crashdump[1614]: smbd crashed
Dec 12 09:18:34 Ricks-iMac crashdump[1614]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:18:44 Ricks-iMac automount[139]: Could not resolve Bonjour service [Prepress 4] because our we hit our resolution timeout of 5 seconds\n
Dec 12 09:19:05 Ricks-iMac crashdump[1625]: smbd crashed
Dec 12 09:19:05 Ricks-iMac crashdump[1625]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:19:15 Ricks-iMac crashdump[1628]: smbd crashed
Dec 12 09:19:15 Ricks-iMac crashdump[1628]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:19:38 Ricks-iMac crashdump[1635]: smbd crashed
Dec 12 09:19:38 Ricks-iMac crashdump[1635]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:20:27 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:28 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:28 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:28 Ricks-iMac crashdump[1641]: smbd crashed
Dec 12 09:20:29 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:29 Ricks-iMac crashdump[1645]: smbd crashed
Dec 12 09:20:29 Ricks-iMac crashdump[1641]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:20:29 Ricks-iMac crashdump[1645]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:20:30 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:34 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:36 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:37 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:39 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:42 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:50 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:20:58 Ricks-iMac mDNSResponder: ERROR: getOptRdata - unknown opt 4
Dec 12 09:22:11 Ricks-iMac crashdump[1661]: smbd crashed
Dec 12 09:22:11 Ricks-iMac crashdump[1662]: smbd crashed
Dec 12 09:22:11 Ricks-iMac crashdump[1661]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:22:11 Ricks-iMac crashdump[1662]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:22:13 Ricks-iMac crashdump[1664]: smbd crashed
Dec 12 09:22:13 Ricks-iMac crashdump[1664]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log
Dec 12 09:22:35 Ricks-iMac crashdump[1670]: smbd crashed
Dec 12 09:22:35 Ricks-iMac crashdump[1670]: crash report written to: /Library/Logs/CrashReporter/smbd.crash.log

Similar Messages

Satellite L300 PSLBGE network connection drops at random times

Hey,
I've had this problem with my laptop since I bought it 1.5 years ago.
Now I run Windows 7 x64, with the latest bios (version 2.20-WIN; date 25/02/10), chipset and wireless (the card is a: Realtek Wireless LAN Adapter 8187B; driver version: 62.1182.0331.2010) drivers.
The problem is that my network connection drops at random times.
This happens both with my wireless and lan card and it happens with a variety of routers ( at work and at home I use a linksys wrt54gl but I have tried it on other routers with the same result).
I don't think this is a hardware fault since the network seems to work fine under Linux ( I've tried Ubuntu 10 ) . Also a while back I took it to the warranty service and they said the hardware is fine but I should "not use many programs at the same time and use Windowx XP".
From what I understand the various devices (wireless card, network card, webcam, etc) inside the laptop are connected to some sort of usb hub. My guess is that is something wrong with this 'hub' since the webcam is also working faulty.
Thanks,

>From what I understand the various devices (wireless card, network card, webcam, etc) inside the laptop are connected to some sort of usb hub. My guess is that is something wrong with this 'hub' since the webcam is also working faulty.
No, the WLan card and LAN card are not connected to any USB interfaces just the webcam so this cannot be any USB issue.
I think it could be an Windows issue since Linux is OK
I think you should check the power management settings in Win 7 and for Wlan /LAN card. This can be done in device manager -> WLan / LAN card properties -> Advanced tab.
I recommend also updating the Win 7 to the latest state install all updates and patches

Network connection drops on MacBook Pro

I have a MacBook Pro 15 “ Unibody OSX 10.5.8 (have not yet upgraded to Snow Leopard) 2.53 GHz Intel Core 2 Duo 4GB Ram purchased in December 2008. This was my first Mac purchase having used only Windows PCs prior to that. My daughter has a nearly identical Macbook Pro purchased for her in July of 2008 which is also running OSX 10.5.8. Everything on my Mac has worked perfectly---and beautifully-- until about one month ago when I started having problems connecting to our home network (Netgear Router, Commcast provided modem). It is important to know that my daughter’s MacBook Pro and my wife’s Dell laptop (Vista) do not and have never experienced the network connection problem I have been experiencing---only my Macbook Pro--- so I assume the fault lies somewhere other than with the router or modem. I lose the internet connection once or twice each day--sometimes when I am in the middle of something and sometimes when I turn my MacBook on from being shut down or from sleep--happens in all three states. After discussing this issue on the phone with several people at Apple tech support (all of whom were very pleasant and patient) it was determined that the internet connection issue could be solved temporarily by dragging the System Configuration Folder from the HD Preference Library to the desktop, then restarting, then clicking on our home network name. Whenever I follow this procedure I am able to connect to the Internet again and everything is fine until another 12 to 24 hours goes by and then I lose the connection again, repeat the fix and so on and so on. Since this problem does not occur more frequently than once or twice a day I have not bothered to take my MacBook to an Apple Store to see if the problem is caused by a hardware issue. I do not have a back up computer for my personal use at home and would rather not take my MacBook in unless until I have exhausted any other options that might exist. Does anyone out there have any suggestions? Any help would be greatly appreciated.

Welcome to the discussions forum Rpma1900.
I can't explain your problem, but since no one has posted any ideas might I suggest the following?
Try turning OFF IPv6 in Network Preferences. IPv6 is a great idea in theory but I've never encountered a network situation in which it's resulted in any performance improvement.
Try giving your MacBook Pro a fixed IP address. Make it numerically higher than any that might be provided by your Netgear router so it won't conflict with them.
Finally, I once experienced this identical problem using a Linksys router, but with a strange twist: my Vista computer would lose connection in much the same manner as your MacBook Pro, while all my Macs would remain happily connected. After exhausting every other imaginable solution, including the above suggestions, I finally removed the Linksys router and installed an AirPort Express. Problem solved.

Windows 7 No internet Access but network connected

Just installed Win7 which was needed for BF3 as i was previously using XP. All was good until my net has just stopped. the LAN icon on the task bar has the yellow symbol with the "!" mark on it.
ive tried unistalling and reinstalling drivers for my NIC. tried resetting my tcp stack, release/renew, dnsflush. have gone through the forums and tried the Bonjour services fix. nothing works. also tried rolling back restore points, no go.
the pc has 2 drives which i switch between, 1 with xp still and 1 with win 7. the xp drives still works no problem and another pc connecting via wi-fi also works just not Win7.
when running the diagnosting tool it keeps coming up with dns not responding
would love some help. this is BS

OK I found the answer! It is a McAfee bug. Go to
http://mvt.mcafee.com. Run Autofix and update the Def file and your done. Wasted too much time on this. I check the Dell Support and they also had this solution.
http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&cs=19&docid=576372&l=en&s=dhs
Thanks for posting this! And get this...just yesterday I received an email (from my working laptop) from McAfee titled "Service Notification: Important Update for your PC". Yea, whatever, I'll get to it later. My desktop hadn't connected to the internet
for a couple of days. Tonight I started troubleshooting and couldn't figure it out. I had network access; my router was giving me an IP and my gateway was my router. But I couldn't ping the router and couldn't get to the internet.
Then I searched and thankfully found your post! As soon as I read it was a McAfee bug I remembered that crucial email! Pasted below is a subset of the entire email, with the relevant portion for those of us who can only access the internet after -rebooting
into 'Safe Mode with Networking':
from: [email protected]
Use this procedure for McAfee Virtual Technician (MVT) to detect and repair the issue. The following steps will repair your product and update your McAfee
software.
Run McAfee Virtual Technician (MVT)
1. Launch your web browser and go to http://mvt.mcafee.com.
2. On the Welcome screen, click Next.
NOTE: The message McAfee
Virtual Technician not found means that MVT is not YET installed on your system.
3. Click Next again.
4. When you are prompted to save or run the file, click Run.
Click Run a second time
if prompted by the Windows operating system.
NOTE: Windows Vista and 7 users may be prompted to allow the application to run. Click Yes in
the User Account Control dialog if prompted.
5. Click I Agree to
begin the installation.
6. Click Finish to
complete the installation.
7. When the MVT installation completes, click Next to
run the scan.
8. If MVT detects issues with your McAfee software, leave the default optionAutoFix and
click Next.
If there are no issues, MVT will complete on its own.
9. When MVT and the AutoFix complete, restart your computer.
Ensure the MVT solution worked properly
After your computer restarts please confirm the following:
You should able to access Internet resources by going to familiar web pages.
You should be able to open your McAfee Security software by double-clicking on the M icon in the Windows system tray.
When McAfee SecurityCenter opens, the status bar should be green and state that "Your computer is secure".
While the McAfee SecurityCenter window is still open, you should request and complete an update successfully by doing the following:
1. Click the Updates drawer.
2. Click Check for Updates.
Run a quick scan
After you know that you can access the Internet and your system is protected, perform a quick scan:
1. Open McAfee SecurityCenter by double-clicking on the M icon
in the Windows system tray.
2. Click the Real-Time Scanning drawer.
3. Click the Scan your PC option.
4. Click Run a quick scan.
If you still experience issues, continue to the next Resolution.

Network connection drops every 15 mins

Hi all,
i'm loosing network access on my iMac. This has started tonight, I had never had any problem before. My iMac is connected through Ethernet interface to a switch, then access to a router and finally to the modem cable. I have several other computers on this home network, all of them working properly and accessing to Internet without any problem.
Only the iMac is behaving strangely, and only since a few hours.
When the problem occurs, everything seems normal : LEDs are on on the switch, ifconfig -a gives a normal report (interface up, IP address ok within network range (no APIPA), netstat -rn OK), and i have no entry in system. log or whatsoever. But I can't nervertheless access to any Internet site, nor can I even ping my defaut router.
I began to "solve" the problem by rebooting the mac, then found that, when the problem occurs, I can solve it by going to Network preferences, advanced options, TCP/IP tab and press the "renew DHCP lease". Then everything works fine for 15 minutes, and I have to renew this operation.
The strange thing is that I used the iMac this morning and it was working fine. When I switched it on again tonight, the problem appeared .... Nothing changed, execpt one thing (but I can't find any connection) : the World of Warcraft laucher has been updated this morning ! But I can not imagine that this might generate trouble on the TCP/IP stack of Mac OS X !!!!
When the network connection is lost, all traffic is stopped, not only HTTP. If I'm for example playing WoW, I loose the connection to the game servers. Renewing the DHCP lease fixes the problem if done quickly enough.
I know I never had this problem before, as I'm connected to WoW almost every day and could so far play without any problem for (sometimes) hours.
I've seen some posts describing more or less the same behavior, but no answers so far. Surprisingly, many of them reports problems occuring every 15 mins.
Any idea ?
Thanks.
PhC.

Hello,
I've found a workaround : I've switched my TCP/IP config to static IP address and everything is working fine so far.
Hope this helps.
PhC.

Hyper-V 2008 R2 Network Connection Drops on a VM

Hyper-V Host: Dell PowerEdge R620 Server with 8 NIC, 256GB RAM connected to iSCSI SAN running Windows 2008 R2 SP1
Guest Machine(s): Windows 2008R2 or 2012 servers (total of 8 servers)
Symptom: Windows 2008 R2 server drops the network connection. Cannot PING or access the server. Tried rebooting guest server, but still not able to connect. So changed the network connection via Hyper-V Management console to another
virtual adapter, and the system comes back online immediately.
Logical thinking: The NIC must be bad. But the problem continued at random times (like once or twice a week - especially in the morning with heavy network traffic load). So, I switched the network back to the original Virtual NIC, and the system
runs fine.
So it seems that the Hyper-V randomly "kills" the NIC when it is utilizing heavy I/O load. And only way to fix it at this time is to swap the virtual NIC (5 sec but need to do manually). Tried add another NIC to provide additional bandwidth,
but same problem exists.
Is there some sort of patch available to address this? Or maybe registry update to IGNORE the heavy I/O on a Guest OS?
I looked into http://support.microsoft.com/kb/2263829/en-us but this seems to be a different issue as the article states that the machines comes online when rebooted where as that is not the case on my part.

Hi,
The best place for this is in the Hyper-V forum, this forum if for Virtual Server 2005.
http://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winserverhyperv
You'll get a lot more Hyper-V eyes on it there.
Also, what type of NICs, updated drivers, teaming, etc?

Wireless network connection drops on my Tecra A4

Hi,
When I am downloading a file ( or just only connected to the web), the connection drops about every 30 seconds for a few seconds. I have tried a lot things, like changing the channel, changing the security setting (wpa/wep), tried another places in the house, but if I sit only a meter from the router, I have the same problem.
The strange thing is the the computer that is directly connected by cable to the router does not show any problems at all..
also see http://www.sappa.nl/dumeter.jpg for an illustration of my problem.
I have read about a possible solution (http://arstechnica.com/news/posts/1080251780.html) by turning off the windows net zero service, and instead of this service to use a different program to search and connect to your network (configfree?!)
I am using a netgear WPN824 router
My laptop is a Tecra A4
Greetings!

Hi
Its not easy to give you a proper answer.
If your unit works with the Atheros WLan card you should use the Atheros Client Utility to configure the WLan settings and the option Use Windows to configure my wireless in the Wireless network properties should be disabled.
Furthermore please check the Toshiba website for new Wlan driver. Maybe the new update could solve the problem.
Bye

Network connectivity drops intermittently

I've got some really weird behavior with my home file server that started early yesterday. It first presented itself with irssi being super slow (occasionally not responded) and I kept getting server disconnects. I poked around journalctl and found this:
pr 15 22:21:01 gaia.haiti systemd[1]: systemd-journald.service watchdog timeout!
Apr 15 22:22:32 gaia.haiti systemd[1]: Starting Trigger Flushing of Journal to Persistent Storage...
Apr 15 22:22:32 gaia.haiti systemd[1]: systemd-journald.service: main process exited, code=killed, status=10/USR1
Apr 15 22:22:32 gaia.haiti systemd[1]: Unit systemd-journald.service entered failed state.
Apr 15 22:22:32 gaia.haiti systemd[1]: Starting Trigger Flushing of Journal to Persistent Storage...
Apr 15 22:22:32 gaia.haiti systemd[1]: Started Trigger Flushing of Journal to Persistent Storage.
Apr 15 22:22:32 gaia.haiti systemd[1]: systemd-journald.service: main process exited, code=killed, status=10/USR1
Apr 15 22:22:32 gaia.haiti systemd[1]: Unit systemd-journald.service entered failed state.
Apr 15 22:22:32 gaia.haiti systemd[1]: Starting Trigger Flushing of Journal to Persistent Storage...
Apr 15 22:22:32 gaia.haiti systemd[1]: systemd-journald.service: main process exited, code=killed, status=10/USR1
Apr 15 22:22:32 gaia.haiti systemd[1]: Unit systemd-journald.service entered failed state.
Apr 15 22:33:52 gaia.haiti systemd-journal[8929]: Forwarding to syslog missed 8 messages.
Apr 15 22:33:53 gaia.haiti systemd-journal[8929]: Journal stopped
Apr 15 22:33:53 gaia.haiti systemd-journal[9057]: Permanent journal is using 1.3G (max allowed 1.3G, trying to leave 11.7M free of 33.9G available → current limit 1.3G).
Apr 15 22:33:53 gaia.haiti systemd-journald[8929]: Received SIGTERM from PID 1 (systemd).
Apr 15 22:33:53 gaia.haiti systemd[1]: Unit systemd-journald.service entered failed state.
Apr 15 22:33:53 gaia.haiti systemd[1]: systemd-journald.service has no holdoff time, scheduling restart.
Apr 15 22:33:53 gaia.haiti systemd[1]: Stopping Journal Service...
Apr 15 22:33:53 gaia.haiti systemd[1]: Starting Journal Service...
Apr 15 22:33:53 gaia.haiti systemd[1]: Started Journal Service.
Apr 15 22:33:53 gaia.haiti systemd-journal[9057]: Journal started
Which looks a little strange but didn't explain the irssi behavior. On a whim I turned up the front fan on the server as I had seen a couple alerts about the disk temp hitting 40C, within a few minutes munin spewed a bunch of alerts, primarily OK alerts around disk latency which is a little strange. That said, I keep getting alerts about eth0 errors being unknown/a high number.
This morning I looked at munin and there are huge gaps in the charts, 1-2 hours which is really strange. Looking in the munin logs I see errors about connecting to the tcp port. Anyone know what's going on? I've got munin configured to use CGI for the graph generation.
While I was typing this I lost network connectivity to the server (ssh/http) for 5-10 minutes, after I got back in I saw the systemd messages above. Scrolling through my buffer I see the following error appeared regularly yesterday:
[1279012.741565] INFO: task nginx:32084 blocked for more than 120 seconds.
[1279012.741616] Not tainted 3.13.7-1-ARCH #1
[1279012.741648] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[1279012.741701] nginx D 00000343 0 32084 32083 0x00000000
[1279012.741706] c0f7fe7c 00200086 c0b4e930 00000343 00000000 c16aca40 2b3cbea6 00048ae4
[1279012.741712] c16aca40 f4c7c2c0 c0faac80 c0faac80 c0f7fe40 00054878 00000000 c0f7ff14
[1279012.741717] 00000000 00000000 c0b4e930 00000000 c0bfe42c c0bfe490 000005a8 000005a8
[1279012.741722] Call Trace:
[1279012.741731] [<c1453443>] schedule+0x23/0x60
[1279012.741736] [<c14537c4>] schedule_preempt_disabled+0x14/0x20
[1279012.741739] [<c1455725>] __mutex_lock_slowpath+0x105/0x330
[1279012.741742] [<c1455960>] mutex_lock+0x10/0x1c
[1279012.741747] [<c1104870>] generic_file_aio_write+0x40/0x90
[1279012.741763] [<c1156467>] do_sync_write+0x57/0x90
[1279012.741767] [<c1156410>] ? do_sync_read+0x90/0x90
[1279012.741770] [<c1156c25>] vfs_write+0x95/0x1c0
[1279012.741773] [<c11572f1>] SyS_write+0x51/0x90
[1279012.741777] [<c145d40d>] sysenter_do_call+0x12/0x28
Looking on google suggests this is related to resource starvation.
Output of free -m:
total used free shared buffers cached
Mem: 3234 3111 123 0 3 63
-/+ buffers/cache: 3044 189
Swap: 2047 1047 1000
I do have 8GB installed but it's i686 (legacy system) and so far my attempts to build a kernel with PAE have failed.
Edit: I stopped subsonic which was occupying about 500M Virtual RAM and munin is updating more reliably.
Edit Edit: Still happened. Installed sysstat and it looks like things are still being blocked. Also shows average memory utilization at 95%
Linux 3.13.7-1-ARCH (gaia.haiti) 04/16/2014 _i686_ (4 CPU)
10:27:33 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 blocked
10:37:33 AM 1 408 1.63 1.74 2.13 0
10:47:33 AM 1 409 1.28 1.39 1.76 0
10:57:38 AM 0 408 2.11 1.70 1.75 4
11:07:38 AM 0 403 11.43 8.34 5.02 14
11:17:38 AM 0 421 15.65 11.50 7.96 16
11:34:57 AM 1 440 29.46 35.64 25.85 4
11:44:57 AM 0 399 16.61 18.16 20.32 3
Average: 0 413 11.17 11.21 9.26 6
Update: Looks to be directly related to Memory utilization, followed this guide on diagnosing high load and appears the system is swapping a bit. I expected it to handle things a little better since I'm using a SSD (the only hardware change in a few months).
Last edited by Ashex (2014-04-16 10:03:31)

Comcast technician said my Technicolor brand modem I rent from them is the problem.He said that most VPN problems show up due to that brand is not configured correctly for that application. He did suggest that any other brand they offer seems to work ok. Mine is a technicolor wih voice modem too. I have to go to my local Comcast office and see what model modems they have available at the time since they cannot be disturbed by a local phone call. I dont know if I may trade in my brand new Technicolor for another failing modem or just suffer the ever-failing connection. The connection does always reconnect by slows my work sometimes creating too many distractions that lead to not remeining focused on the task at hand........especially when a client needs have to wait until reconnection. I plan to call the Technicolor manufacturer first to see if they have a fix first. Cannot assume anyone at Comcast has done the research.

Unstable Time Capsule - Sporadic Network Connections Drop

I just had a belkin router in, and then I got the time capsule, I replaced the belkin and now no connection (wireless) is persistent. it connects/disconnects sporadically.. Plain ridiculous....any clues?
This is the wifi setup....all wireless here

The Radio Mode that you have chosen.....802.11a --- 802.11b/g.....will only allow an older "a" device to connect to the 5 GHz network.
You might want to consider having this setting at 802.11 "a/n", or 802.11 "n" only. Then faster "n" devices will be able to connect to the 5 GHz network. As it stands, you are forcing any "n" device that you have to try to connect to the "b/g" network. If it connects, it will do so at much lower speeds.
"a" devices will only connect at 54 Mbps (same speed as "g" devices), so I'm not sure what you are hoping to gain in having the 5 GHz network setup so only "a' devices will connect.
Maybe I am missing something. Can you clarify here?

Getting error - Cannot connect to internet; please check network connection

I can connect using wifi without any issues and surf the net. Connections seems to be fine and my friends who are on the same service have no issues. Any ideas on cause?

They said all their networks are up and working. They walked me thru some steps (powering off). Turning off Data, turn it back on, turn of LTE then turn it on. It was working fine until 8 pm last night and no new downloads so I left them scratching their heads. Worse case I will head down to the Apple Store this evening and have one of the guru's look at it but willing to bet they will reload the operating system.

Internet Freezes then loads back up?

Hi I'm posting this to see if I can figure out whether my issue is with my internet or the iMac itself.
I have 2 iMacs and the DSL modem is hooked up to one of them.
When I'm on the iMac that my DSL modem is hooked up to, it will sometimes freeze for about 5 seconds and then load back up. I.E. if I'm playing some sort of internet linked game, I will be playing, then everything will freeze for 5 seconds, then load up all at once.
These problems however will not happen on the other iMac as well as the other laptops we have around the house.
Also if I'm watching a video on Youtube, if it freezes in the middle of the video, I will have to refresh the page just to continue watching the video. I will have to refresh the page about 5 times within about an 8 minute video.
I'm not sure whether this is a Internet problem (my modem is like 5 years old) or just a problem I can solve straight from my iMac. I'd like to know soon so I get can this problem solved and see if i have to go out and buy a new modem.
Post if you need more information!

Hi,
Try ; Intel-based Macs: Resetting the System Management Controller (SMC)
and : About NVRAM and PRAM
to ensure the proper operation of the SMC.
and if still issues persist, try: OS X: What is Safe Boot, Safe Mode?
Cheers

Internet slowed, then random connectivity

So I purchased my MacBook roughly 2 years ago some time this month. It was fine for the first year and my dad didn't want to get AppleCare because nothing had happened to it yet. As I reached the end of my warranty, the internet connection started slowing down gradually. About three months after my warranty expired, my hard drive died. I had to shell out $100 for a new one and installation. At this point in time, my internet connection was at it's worse. It would show full signal strength to my router, however would not allow internet access. I called my ISP and had them reset it and my internet was not better. Thinking it was my router I went out and got another. With that router, I was able to achieve random connectivity whenever my MacBook felt like it. We have since purchased another router in the hopes that it would get better, but it didn't. It's stayed the same, or gotten worse. I can achieve internet through wired means, directly to the wall, but it's rather bothersome and defeats the purpose of having a laptop if you can't move it. If you think you know what the problem is, let me know. If you know how much the repair would be, let me know. If it's too high, as a simple look-over costs $50, I would rather purchase a new computer.

Hi,
Have a look through this discussion. There might be an answer.
http://discussions.apple.com/thread.jspa?threadID=1345209&tstart=15
Good luck,
Alan

B109n-z making my network connection drop

Just got a B109n-z. It connects fine wirelessly and works no problem either with wireless or USB. But, everytime I press 'Print' I completeley lose connection to my router. I can't even see it. It will reconnect briefly in Device Manager but keeps losing it every couple of minutes until I reboot. If I don't print I don't have any problems. I can still print wirelessly when I can't see the router but can't go online. Any ideas???

Tell me your brand/model router and your ISP type. I have a few ideas....
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP

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

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.

Internet freezes then network connections drop?

Similar Messages

Maybe you are looking for