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Network connection freezes for a few minutes then comes back
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Forum Regular
Join Date: Jun 2001
Status:
Offline
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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?
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"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
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Professional Poster
Join Date: Apr 2001
Location: Asheville, NC
Status:
Offline
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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.
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ACSA 10.4/10.3, ACTC 10.3, ACHDS 10.3
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Forum Regular
Join Date: Jun 2001
Status:
Offline
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2.5 GB
The weirdest part is the connections hanging to localhost. I've never seen that before.
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"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
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Administrator
Join Date: Apr 2001
Location: San Antonio TX USA
Status:
Offline
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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.
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Glenn -----OTR/L, MOT, Tx
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Forum Regular
Join Date: Jun 2001
Status:
Offline
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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.
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"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
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Forum Regular
Join Date: Jun 2001
Status:
Offline
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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
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"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
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Dedicated MacNNer
Join Date: Oct 2003
Location: Round Rock, TX
Status:
Offline
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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.
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Forum Regular
Join Date: Jun 2001
Status:
Offline
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It seems that the combination of switching to Camino and upgrading the router has helped.
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"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
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Mac Elite
Join Date: Oct 2000
Location: Seattle
Status:
Offline
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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.
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You can take the dude out of So Cal, but you can't take the dude outta the dude, dude!
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Dedicated MacNNer
Join Date: Oct 2003
Location: Round Rock, TX
Status:
Offline
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Thanks for the reminder to update the router. I checked and an update was available for mine. So far no hangs since.
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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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.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Junior Member
Join Date: Aug 2001
Status:
Offline
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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?
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I've been so many places, I've seen so many faces, and these blue, green, and purple HILLS
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Dedicated MacNNer
Join Date: Jul 2002
Location: Germany
Status:
Offline
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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.
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