Welcome to the MacNN Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

You are here: MacNN Forums > Software - Troubleshooting and Discussion > macOS > Network connection freezes for a few minutes then comes back

Network connection freezes for a few minutes then comes back
Thread Tools
discstickers
Forum Regular
Join Date: Jun 2001
Status: Offline
Reply With Quote
Feb 5, 2006, 01:05 AM
 
Every so often, when I'm just browsing around, my network connection just hangs. I know it's not my external connection, because even connections to localhost don't work. This is on a G5 with 10.4.4 (but I've seen it on 10.4.3).

netstat almost always looks like this. One or two connections in CLOSE_WAIT with incoming data. Sometimes, netstat hangs as well, and comes back when web pages resume loading.
Code:
]% netstat Active Internet connections Proto Recv-Q Send-Q Local Address Foreign Address (state) tcp4 441 0 192.168.0.3.61201 macnn.com.http CLOSE_WAIT tcp4 413 0 192.168.0.3.61200 macnn.com.http CLOSE_WAIT tcp4 369 0 192.168.0.3.61199 macnn.com.http CLOSE_WAIT tcp4 396 0 192.168.0.3.61198 macnn.com.http CLOSE_WAIT tcp4 0 0 192.168.0.3.61175 magenta.macnn.co.http CLOSE_WAIT tcp4 0 0 192.168.0.3.61172 forums.something.http CLOSE_WAIT tcp4 0 0 192.168.0.3.61004 cyrus.andrew.cmu.imaps ESTABLISHED tcp4 0 0 192.168.0.3.60937 cyrus.andrew.cmu.imaps ESTABLISHED tcp4 0 0 192.168.0.3.60723 cyrus.andrew.cmu.imaps ESTABLISHED tcp4 0 0 192.168.0.3.60722 64.12.31.140.aol ESTABLISHED tcp4 0 0 192.168.0.3.60721 caim-m03b.blue.a.aol ESTABLISHED tcp4 0 0 192.168.0.3.60720 oam-d11a.blue.ao.aol ESTABLISHED tcp4 0 0 192.168.0.3.60719 64.12.31.96.aol ESTABLISHED tcp4 0 0 192.168.0.3.60715 caim-d03b.blue.a.aol ESTABLISHED tcp4 0 0 192.168.0.3.60714 oam-d07c.blue.ao.aol ESTABLISHED tcp4 0 0 192.168.0.3.60712 205.188.9.126.aol ESTABLISHED tcp4 0 0 192.168.0.3.60711 205.188.9.40.aol ESTABLISHED tcp4 0 0 192.168.0.3.60705 64.233.167.125.jabber- ESTABLISHED tcp4 0 0 localhost.netinfo-loca localhost.1015 ESTABLISHED tcp4 0 0 localhost.1015 localhost.netinfo-loca ESTABLISHED tcp4 0 0 localhost.netinfo-loca localhost.1017 ESTABLISHED tcp4 0 0 localhost.1017 localhost.netinfo-loca ESTABLISHED tcp4 0 0 localhost.netinfo-loca localhost.1021 ESTABLISHED tcp4 0 0 localhost.1021 localhost.netinfo-loca ESTABLISHED
When everything clears back up, the CLOSE_WAITs are gone.

Other times, it seems Safari has trouble connecting to multiple servers at the same time. Like, if someone posts a lot of Image Shack thumbnails (which are hosted across many different domains), only a couple will load and I'll have to stop and reload a couple of times to get them all.

It doesn't affect open connections. So for instance, I can still talk on AIM.

It seems like I'm running into a ceiling on the maximum open connections or something. Any ideas?
"It's not like Windows users don't have any power. I think a lot of people are happy with Windows, and that's an incredibly depressing thought." -Steve Jobs
     
Big Mac
Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status: Offline
Reply With Quote
Feb 5, 2006, 06:00 AM
 
Strange.

"The natural progress of things is for liberty to yield and government to gain ground." TJ
     
Detrius
Professional Poster
Join Date: Apr 2001
Location: Asheville, NC
Status: Offline
Reply With Quote
Feb 5, 2006, 01:34 PM
 
One question: how much RAM do you have?


Also, mtr is a very useful tool for diagnosing some network problems. Just leave it running pinging yahoo, google, or your ISP, and see where the packets get dropped.
ACSA 10.4/10.3, ACTC 10.3, ACHDS 10.3
     
discstickers  (op)
Forum Regular
Join Date: Jun 2001
Status: Offline
Reply With Quote
Feb 5, 2006, 02:40 PM
 
2.5 GB

The weirdest part is the connections hanging to localhost. I've never seen that before.
"It's not like Windows users don't have any power. I think a lot of people are happy with Windows, and that's an incredibly depressing thought." -Steve Jobs
     
ghporter
Administrator
Join Date: Apr 2001
Location: San Antonio TX USA
Status: Offline
Reply With Quote
Feb 5, 2006, 03:23 PM
 
I was going to weigh in that this belonged in Networking, but now I don't think so. If it's hanging with localhost, there's something odd going on beyond network settings.

Glenn -----OTR/L, MOT, Tx
     
discstickers  (op)
Forum Regular
Join Date: Jun 2001
Status: Offline
Reply With Quote
Feb 7, 2006, 03:08 AM
 
It looks like it may just be a Safari thing. During the most recent hangup, mtr show absolutely no packet loss to both news.google.com and apple.com, both of which were hung in Safari. I opened up Firefox and it loaded Google news just fine. I am running Pith Helmet, but I've seen no difference with it disabled.
"It's not like Windows users don't have any power. I think a lot of people are happy with Windows, and that's an incredibly depressing thought." -Steve Jobs
     
discstickers  (op)
Forum Regular
Join Date: Jun 2001
Status: Offline
Reply With Quote
Apr 12, 2006, 12:41 AM
 
Updates:

a) It goes away when I quit and restart Safari. Other browsers are affected, but again, quiting and restarting fix it
b) I installed 10.4 on my spare hard drive and the problem showed up immediately.
c) Using my old PBG4 as an ethernet bridge works great, no problems
d) Using a store-bought ethernet bridge causes the same problems
e) Changing wireless routers did not help
"It's not like Windows users don't have any power. I think a lot of people are happy with Windows, and that's an incredibly depressing thought." -Steve Jobs
     
gperks
Dedicated MacNNer
Join Date: Oct 2003
Location: Round Rock, TX
Status: Offline
Reply With Quote
Apr 12, 2006, 03:04 PM
 
I have no solution to offer, but I am seeing the same issue. Browsing away quite happily then Safari basically hangs loading pages. All tabs are affected. Usually the progress bar covers the http:// section but gets no further. Come back in a few minutes and pages will load fine.

MBP, PB, and I believe my wife was complaining her G5 does the same thing too.

Need to play some more to see if only Safari is affected at the time or not.
     
discstickers  (op)
Forum Regular
Join Date: Jun 2001
Status: Offline
Reply With Quote
Apr 12, 2006, 11:51 PM
 
It seems that the combination of switching to Camino and upgrading the router has helped.
"It's not like Windows users don't have any power. I think a lot of people are happy with Windows, and that's an incredibly depressing thought." -Steve Jobs
     
Gavin
Mac Elite
Join Date: Oct 2000
Location: Seattle
Status: Offline
Reply With Quote
Apr 15, 2006, 09:08 AM
 
There could be a couple of different things going on. Occasionally my wireless network will drop for a minute or two if a bug truck goes by and fuzzes up the radio signal.
You can take the dude out of So Cal, but you can't take the dude outta the dude, dude!
     
gperks
Dedicated MacNNer
Join Date: Oct 2003
Location: Round Rock, TX
Status: Offline
Reply With Quote
Apr 16, 2006, 01:40 AM
 
Thanks for the reminder to update the router. I checked and an update was available for mine. So far no hangs since.
     
Big Mac
Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status: Offline
Reply With Quote
Apr 16, 2006, 02:20 AM
 
At one point Adelphia performed some sort of modification to the network that caused it to be completely unavailable to Mac users. This could be something similar.

"The natural progress of things is for liberty to yield and government to gain ground." TJ
     
FlammableYurt
Junior Member
Join Date: Aug 2001
Status: Offline
Reply With Quote
Apr 16, 2006, 02:38 PM
 
That's interesting. I don't know much about networking, but it looks like you're on Carnegie Mellon's network (the cyrus.andrew.cmu.imaps gives it away). I am too, and I have the exact same problem as you do. Could the problem lie in the network itself?
I've been so many places, I've seen so many faces, and these blue, green, and purple HILLS
     
Taipan
Dedicated MacNNer
Join Date: Jul 2002
Location: Germany
Status: Offline
Reply With Quote
Apr 16, 2006, 05:15 PM
 
Hi!

I have experienced the same thing. Only Safari is affected. The connection seems to hang for about two minutes or so before everything reverts to normal operation. A ping to the site that's being loaded is OK, so it may be that only http connections are affected. Replacing the WLAN router didn't have any effect.
     
   
Thread Tools
 
Forum Links
Forum Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Top
Privacy Policy
All times are GMT -4. The time now is 12:27 AM.
All contents of these forums © 1995-2017 MacNN. All rights reserved.
Branding + Design: www.gesamtbild.com
vBulletin v.3.8.8 © 2000-2017, Jelsoft Enterprises Ltd.,