Intel iMacs dropping network connections
Lao Ming
connections. After rebooting the Macs, the problem disappears
at least for some random amount of time. Students report to me
that it will be working for them and then, suddenly, they drop off
the network.
Oddly, the iMacs still retain their IP address in the Network System
Preference and, from Terminal, they can still ping machines
off-campus. The problem is first seen with Safari and Firefox not
connecting to a server.
I finally telephoned Apple last week. After speaking with a tech
and
later, an engineer, the latter asked me what I thought the problem
might be and I suggested possibly a plist. So the engineer had me
remove the NetworkInterfaces.plist and the
com.apple.network.identification.plist from
/Library/Preferences/SystemConfiguration and, after a reboot,
the problem went away -- well, so it seemed. It was a reboot that
always reset it before.
Two days ago the problem resurfaced and, now, my solution has been
to
go into Terminal and toggle the network interface with:
ifconfig en0 down
ifconfig en0 up
That fixes the problem without a reboot, but now, not even that all
the time. However, that's still no good because it is only temporary.
I have to find out what is causing this and am hoping some of you
will have some great ideas about it.
Thanks for any help.
Lao-Ming
Lao Ming
Application Firewall (in the Security System Pref) as "Set access for
specific services and applications" checked and Safari and Firefox set
as "Allow incoming connections".
Lao-Ming
salgud
I'm very interested in your post. I've had the same problem for some time
on two iMacs. Apple replaced my first one with a new one after months and
months of this problem, and now the new one has the same problem. I'll be
following this thread avidly!
John Varela
wrote:
I had similar problems with Airport and my Intel iMac. At the same
time my wife was having no such problems with her G5 iMac.
Typically, I would lose connection while either in Firefox or in
news groups, the places where I spend the most time. When it first
started happening, just going to the Menu Bar and turning Airport
off and back on again cleared the problem. In time that stopped
working and then I would have to select Join Other Network, reselect
the same network, and then all was well.
The severity of the problem would ebb and flow. I went
systematically through settings trying different combinations, made
sure the settings in the iMac matched those of the G5, etc. The G5
never had the problem.
The G5 is at the far end of the house from the router, where the
router signal is too weak to be usable. So the G5 is reached by a
"range extender" repeater. The G5 sees only the range extender.
The Intel, however, sees both the router and the range extender,
with the latter's signal almost as strong as the former's. I
thought the Intel's problem might have to do with interference of
the signals, but one would think that D-Link would have somehow
provided for that situation.
Last summer the frequency of the interruptions was getting to the
point that the network was becoming unusable. I was considering
reinstalling Leopard when, fortuitously, Snow Leopard was released.
As soon as I installed Snow Leopard my problem went away. I have
left all settings exactly as the installer put them.
I still get an occasional drop-out, maybe once a week or less often,
and it's quickly cleared with the off-on at the Menu Bar.
HTH
--
John Varela
Trade NEWlamps for OLDlamps for email
Lao Ming
> On Thu, 19 Nov 2009 04:56:13 UTC, Lao Ming <laoming...@gmail.com>
Geez, I'm not sure if I should feel better because at least I know I'm
not the only one experiencing this or more hopeless because I know I'm
not the only one unable to fix this! :)
Thanks a bunch for your replies, John and salgud. If I learn
anything, I'll be sure to post whatever I come up with.
Lao Ming
whatsoever. This is weird.