libpcap output on 2.6.24-21
** Attachment added: "2.6.24-working.pcap"
http://launchpadlibrarian.net/19249656/2.6.24-working.pcap
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> try adding:
> echo 0 > /proc/sys/net/ipv4/tcp_sack
No good unfortunately, I captured the output of tcpdump and have
attached it.
** Attachment added: "2.6.27-issue.pcap"
http://launchpadlibrarian.net/19249651/2.6.27-issue.pcap
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https
Il giorno Sun, 02 Nov 2008 13:38:39 -
Dean Holland <[EMAIL PROTECTED]> ha scritto:
> I am still seeing issues even with the 2.6.27-7.15 kernel and updated
> procps package. Setting tcp_timestamps to 0 does not resolve it for
> me.
try adding:
echo 0 > /proc/sys/net/ipv4/tcp_sack
--
unable t
I am still seeing issues even with the 2.6.27-7.15 kernel and updated
procps package. Setting tcp_timestamps to 0 does not resolve it for me.
I can, however, reboot into the 2.6.24-21-server (from Hardy) and all
browsing etc. returns to normal.
[EMAIL PROTECTED]:~$ apt-cache policy procps linux-i
http://www.ubuntu.com/usn/usn-661-1
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Technical explanation of how the procps package undoes the tcp timestamp
setting described earlier in this bug:
http://blog.redvoodoo.org/2008/10/backing-out-procps-change-how-it-
works.html
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You rece
procps (1:3.2.7-9ubuntu3) intrepid-security; urgency=low
* Drop debian/sysctl.d/10-tcp-timestamps-workaround.conf again now that we
have a fixed kernel, and make sure it gets removed on upgrade to this
version (LP: #264019).
-- Colin Watson <[EMAIL PROTECTED]> Thu, 30 Oct 2008 03:39:3
linux (2.6.27-7.15) intrepid-security; urgency=low
[ Upstream Kernel Changes ]
* tcp: Restore ordering of TCP options for the sake of inter-operability
- LP: #264019
-- Tim Gardner <[EMAIL PROTECTED]> Mon, 27 Oct 2008 19:28:06
-0600
** Changed in: linux (Ubuntu Intrepid)
Stat
For those watching this bug you can find out why we did things this way
here:
http://blog.redvoodoo.org/2008/10/tcp-timestamps-2627-why-ubuntu-put-
out.html
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the decision has been made to release this as a security update
immediately post-release, so a separate release notes entry is not
warranted.
** Changed in: ubuntu-release-notes
Status: Confirmed => Invalid
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On Wed, Oct 29, 2008 at 10:56:23PM -, Nick Lowe wrote:
> Just to clarify this in stark terms...
> The workaround -introduces- a data corruption problem at high data rates
> because it disables PAWS protection in the TCP/IP stack by virtue of the
> timestamps no longer being there.
> The serve
If I understand this correctly, TCP timestamps were completely broken in
Hardy, so the workaround introduces no new bug or regression. Plus, a
fixed kernel will probably come in a matter of days. If this is true I
don't see the point in delaying the release.
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Just to clarify this in stark terms...
The workaround -introduces- a data corruption problem at high data rates
because it disables PAWS protection in the TCP/IP stack by virtue of the
timestamps no longer being there.
The server release will go out with this, which will be run in places
highly l
That certain "bitter" red hat employee would happen to be one of the
maintainers of the Linux TCP/IP stack:
http://lxr.linux.no/linux+v2.6.26/MAINTAINERS#L2947
I certainly had no appreciation of the importance of PAWS protection...
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Sorry? Respectfully, you seem to be missing the point here.
"So its a data corruption issue on top of a security issue.
Has this been communicated into the Ubuntu bug tracker?
-jef"
I have quoted and posted a link here for that very reason.
Thanks,
Nick
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Let's leave the childish remarks to certain bitter Red Hat employees on
LWN, ok? This is a bug report and is not the place to engage in this
sort of nonsense.
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>Ubuntu made the wrong decision, there is simply no argument for
>the way this was "handled."
Called it ;)
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Bugs, which is subscri
http://lwn.net/SubscriberLink/304791/b4651360c812df4a/?format=printable
Posted Oct 29, 2008 14:29 UTC (Wed) by davem (subscriber, #4154) [Link]
Btw, if you care at all about your data, you will not run
Ubuntu's release that doesn't fix the kernel and instead
turns timestamps off.
If you turn time
Intrepid - tcp: Restore ordering of TCP options for the sake of inter-
operability
** Changed in: linux (Ubuntu Intrepid)
Importance: Medium => High
Assignee: (unassigned) => Tim Gardner (timg-tpi)
Status: Triaged => Fix Committed
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The new procps deb I just updated via synaptic fixed the network issue.
Congrats. This will give a new user an opportunity to fairly judge
Ubuntu without having to deal with a connection issue. Nice work.
Thanks for your efforts to everyone involved.
Bob Good
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Status: Unknown => Invalid
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On Mon, Oct 27, 2008 at 03:57:37PM -, Michael Hipp wrote:
> I can confirm the fix works (this on an Alltel 3G/EVDO network with
> WinXP as a router - don't laugh). The problem had been consistent and
> repeatable before. Good work Colin and anyone else that helped.
> Could you let us know when
I can confirm that running procps_3.2.7-9ubuntu2_i386.deb worked as
expected.
I downloaded the .deb package, reversed the net.ipv4.tcp_timestamps = 0
in /etc/sysctl.conf fix and then applied the package.
I am using a Westell Model 327W (D90-327W15-06) Manufactured 9/2006 with
Verizon DSL.
Thanks
I can confirm the fix works (this on an Alltel 3G/EVDO network with
WinXP as a router - don't laugh). The problem had been consistent and
repeatable before. Good work Colin and anyone else that helped.
Could you let us know when the fix has made it into an iso so we can
test a fresh install?
--
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Importance: Unknown
Status: Unknown
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As the workaround is now in place, I'm lowering the importance of the
kernel task to medium as it's no longer urgent.
** Changed in: linux (Ubuntu Intrepid)
Importance: High => Medium
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This is the right decision. Thanks!
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The procps workaround should resolve this issue for affected users for
the 8.10 release. We also plan to issue a kernel update after the
release with the proper fix, once it has been fully tested.
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Yo
This bug was fixed in the package procps - 1:3.2.7-9ubuntu2
---
procps (1:3.2.7-9ubuntu2) intrepid; urgency=low
* Add debian/sysctl.d/10-tcp-timestamps-workaround.conf to disable TCP
timestamping, since its implementation in the 2.6.27 kernel in Ubuntu
8.10 causes problems w
Due to time constraints, it looks as if we're going to work around this
in procps for 8.10.
** Also affects: procps (Ubuntu)
Importance: Undecided
Status: New
** Changed in: procps (Ubuntu Intrepid)
Importance: Undecided => Critical
Assignee: (unassigned) => Colin Watson (kamion
Good point regarding the opacity of the release note entry's title,
thanks. I've updated this now to read:
Unable to browse some websites when connected to particular Internet
providers
I'm reluctant to name particular ISPs or routers in our release notes
because we haven't established what ro
** Changed in: linux
Status: Confirmed => Fix Released
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I've just seen:
http://kerneltrap.org/node/16680
This isn't going to be a corner case issue.
If the problem here is one of QA process having rebuilt and not rebuild time
itself, what is needed here IMO is a clear case of risk management.
My view is that, even this late in the release cycle, t
Quote
"I'm sorry, but just no. You clearly didn't think that through: if they are
affected by this issue then they won't be able to get the updated kernel,
surely you thought of this? The whole point of the release candidate stage is
to catch critical bugs and this bug /is/ critical as you are p
Looking at the rease notes which -normal- user is going to even
associate Internet with TCP... (In the UK, most people think TCP is a
brand of antiseptic!)
It is implicit to -us- only.
If I asked my brother or mom to read it, what would they say?
They'll just think, I can't get to where I want t
Just to clarify on my point above, what Nick said about it being people
who aren't technically minded being affected by this is what I was
attempting to show. On mass, the people who are affected by this will be
users who don't read the release notes (I often don't bother, for
example, only when do
I agree... You should really delay for this if you need more time...
RC shouldn't mean Release ComeHellOrHighWater
The users who are most likely to hit this are home users behind their
aged/unmaintained consumer routers who are highly unlikely to understand
why they can't access the Web and will
Thanks all for the TCP timestamps workaround on the 8.10 rc release
notes page. I can confirm experiencing the described "certain sites"
connection problem in ibex after an upgrade from hardy LTS.
I am using a Westel Model 327W wired/wireless router on Verizon DSL.
After an attempt to diagnose th
>The kernel fix is known upstream; implementing it requires kernel uploads
>and installer rebuilds, which it's just not possible to fit in between the
>release candidate and the release. We will certainly want to include this
>fix in a kernel update as soon as possible after the release, but this i
Can someone change the release notes header to read "Severe Connectivity
Problems caused by Enabled TCP Timestamps behind older routers". the
heading "TCP Timestamps" says nothing that will catch the eye of someone
reading the release notes before an upgrade.
Please also put "Verizon" in bold.
On Sat, Oct 25, 2008 at 11:00:46AM -, John Lee wrote:
> It's mentioned in the release notes as if it is a minor issue- there
> must e a lot of ubuntu users using oldish home routers - this is going
> to cause new ibexers a lot of problems, especially if they don't read
> the release notes caref
Gitweb of patch and description for those interested:
http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git;a=commitdiff;h=fd6149d332973bafa50f03ddb0ea9513e67f4517
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I'll add that this bug also makes the initial install take a really long
time also likely because it's having to retry.
Please add it to final if at all possible.
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Yup, yuk indeed.
I would have to question the value of a release candidate if an issue as
significant as this cant be fixed before final...
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Yuk, I just encountered this problem when doing an 'update' using
update manager - it works ok for some sites but then the transfer rate
goes to zero for others! I'm going through a BT Voyager 2500 11g router
via Talktalk broadband - not sure which the buggy router is Because
it's site specific,
IMO, now that the issue is understood, a patch is available and appears
to be relative unobtrusive, it would be nice if a fix for this could be
worked in before final.
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Just wanted to add a note for the kernel team to reference. The patch
was recently accepted upstream:
[EMAIL PROTECTED]:~/linux-2.6$ git log -p
fd6149d332973bafa50f03ddb0ea9513e67f4517
commit fd6149d332973bafa50f03ddb0ea9513e67f4517
Author: Ilpo Järvinen <[EMAIL PROTECTED]>
Date: Thu Oct 23 14
** Changed in: linux (Ubuntu Intrepid)
Target: None => intrepid-updates
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updated the release notes to mention that upstream is working on a fix.
** Changed in: ubuntu-release-notes
Status: In Progress => Fix Released
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** Changed in: linux
Status: Unknown => Confirmed
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More information has become available about this issue via the duplicate
bug #272896, including an upstream bug report where upstream discusses a
fix to preserve interoperability with these devices without losing tcp
timestamp support.
I'm reopening this bug report, we should update the release no
** Bug watch added: Linux Kernel Bug Tracker #11721
http://bugzilla.kernel.org/show_bug.cgi?id=11721
** Also affects: linux via
http://bugzilla.kernel.org/show_bug.cgi?id=11721
Importance: Unknown
Status: Unknown
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Colin,
Will these release notes be included within the Intrepid iso?
Thank you,
Bob Good
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I've added this text to the release notes (wiki notation):
== TCP timestamps ==
Linux 2.6.27 now sets the timestamps option in TCP packets
([[http://www.ietf.org/rfc/rfc1323.txt|RFC 1323]]), an option dating
from 1992 to improve performance over high-bandwidth-times-latency paths
and to improve r
** Changed in: ubuntu-release-notes
Importance: Undecided => Medium
Assignee: (unassigned) => Colin Watson (kamion)
Status: New => Triaged
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I've used the workaround on a variety of networks (including my
university and a friend's cable-modem based networks) without issue, so
using the workaround as the default doesn't seem to have a negative
effect on functionality.
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Adam,
Thanks for the reply. I have a question...would there be a disadvantage to
including `sysctl -w net.ipv4.tcp_timestamps=0` or 'net.ipv4.tcp_timestamps=0'
by default for those of us who use Verizon? Would it affect the functioning of
anyone's computer? Seems to me that could be easily test
Adam,
* What makes TCP timestamps desired? What do they get us?
* Why don't other OS's (OS X, Windows) experience the same problem?
I agree that Linux shouldn't be buggy to work around router issues,
however, the fact that other OS's have no issues suggests that there may
be some compliant beh
bobby: because TCP timestamps are a desired feature. The fact that they
were broken in the upstream kernel for a long time was the bug. It's
just that now they've been fixed, this is exposing the fact that some
routers do not handle timestamps correctly.
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Why is it that if we use a kernel other than 2.6.27 then our internet
connection works fine? This problem started with the introduction of the
2.6.27 kernel so how can it not be a kernel problem? This decision seems
to be side stepping a really big problem for a few of us. Luckily
there's a solutio
Thanks for the feedback; marking this as invalid for the linux package,
because this has been isolated as a router bug and not a bug in the
Linux kernel. It is not generally appropriate to diverge from the
upstream kernel over policy decisions in the IP stack, when the kernel
is not actually buggy
I can also confirm this issue on verizon DSL using a Westell 6100 modem.
When using my laptop on other connections the issue doesn't appear.
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Forest,
Actually, I tried it at '/etc/sysctl.conf' by adding
'net.ipv4.tcp_timestamps=0' suggested in the link above but it didn't work.
Placing `sysctl -w net.ipv4.tcp_timestamps=0` within '/etc/init.d/rc.local'
worked for me.
BTW, I had the same problem in Fedora 10. I would expect this would
bobbyjean58,
The standard place for this kind of setting is in /etc/sysctl.conf. Add
the following line to that file:
net.ipv4.tcp_timestamps=0
This is preferred over /etc/init.d/rc.local (actually, you may want to
change /etc/rc.local instead of that file, too).
I agree, though. Ubuntu is su
I placed the command 'sysctl -w net.ipv4.tcp_timestamps=0' in
/etc/init.d/rc.local, rebooted, and as of right now everything is fine.
No connection problems. But for a novice this might be a bit of a
problem to do. Isn't there a way to include this command in the Intrepid
final release by default?
Thanks, for the clarification, Steve. Running 'sysctl -w
net.ipv4.tcp_timestamps=0' as root works but you lose it once you
reboot.
Yes, I uninstalled Firestarter and rebooted before trying that command.
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bobbyjean58, I think the pointer to wiki.mandriva.com referred to the
tcp_timestamps change, not ipv6. Can you confirm that using the sysctl
command Forest mentions in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/264019/comments/35
fixes the problem for you, when run as root?
If so, I'll
One of the first things I tried to rectify this problem was to disable
ipv6. That didn't work, at least for me.
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I *think* that `sysctl -w net.ipv4.tcp_timestamps=0` resolves this issue
for me.
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Indeed, this looks very similar:
https://qa.mandriva.com/show_bug.cgi?id=43372
I will try the fix in a few and report back.
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I also had this problem. I found my solution here:
http://wiki.mandriva.com/en/2009.0_Errata#Slow_or_no_internet_response_.28particularly_web_browsing.29
Hope this helps.
Nate.
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It does not matter which router you use. I have tried this on a few
Verizon DSL connections with different DSL modems and routers (Netgear,
Linux gateway, Linksys), they all have the same problem. I am able to
ping the server and since one of my servers on the inet has this problem
I was able to do
I experienced the same problem on my Thinkpad X40 : running the 2.6.27
kernel I could ping all hosts on the web, but couldn't wget/curl any of
them. Even apt-get update couldn't connect to security.ubuntu.com !
Everything works fine with the 2.6.24 kernel. I tried this at home, I'll
try it again at
The complicating factor is that the problem does not exist at all on
2.6.24 (running intrepid userland), but is very easy to reproduce with
2.6.27. I agree that our network environments are related, but the
kernel version seems to be a factor, as well.
I have a Westell WireSpeed Data Gateway. I
I've run a comparable test against www.youtube.com here, and find that
the server responds to the query with one very large, fragmented packet.
Given that these packet fragments never appear at all in Forest's trace,
and given that there's a common theme that this affects users of Verizon
DSL, it s
Such a bug has a significant impact on the release so I'm confirming
this for intrepid, but from the available information, I'm not sure that
we're really looking at a kernel bug here. The wireshark traces
available certainly seem to indicate a failure of the return traffic
from the server to be r
Attached PCAP files as requested by slangasek.
** Attachment added: "PCAP file"
http://launchpadlibrarian.net/18548206/wireshark3.pcap
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Attached PCAP files as requested by slangasek.
** Attachment added: "PCAP file"
http://launchpadlibrarian.net/18548200/wireshark2.pcap
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Attached PCAP files as requested by slangasek.
** Attachment added: "PCAP file"
http://launchpadlibrarian.net/18548193/wireshark.pcap
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I have this problem as well. Running 64 bit, wireless with ndiswrapper,
verizon dsl. I would like to mention that the websites that don't work
differ from person to person. I couldn't access launchpad for instance.
Switching to the older kernel fixed my problem, I didn't get to try
firestarter beca
I'm on Verizon DSL.
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I also experienced the problem with Verizon DSL as the ISP.
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I'm also on Verizon (well, Earthlink via Fairpoint, previously Verizon)
DSL.
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I also notice that on my Verizon DSL it does NOT work but on a Comcast
Cable or Time Warner Cable connection, it is fine. I hope this info
helps with the troubleshooting. For the time being I will downgrade to
2.6.25.
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One more wireshark capture. This one shows multiple duplicate ACKs.
** Attachment added: "wireshark trace"
http://launchpadlibrarian.net/18474436/wireshark3.txt
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Yeah, can't be #230456 because that patch is already applied.
I have another wireshark trace attached. The basic problem is "TCP
Previous segment lost" followed by a series of "TCP Dup Ack".
** Attachment added: "wireshark trace"
http://launchpadlibrarian.net/18474227/wireshark2.txt
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Text export of wireshark trace is attached.
BTW, I'm wondering if this is related to
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/230456. I don't
really know anything about this, though, so I could be way off...
** Attachment added: "wireshark trace"
http://launchpadlibrarian.net/1847
BTW, firestarter doesn't seem to help here. I suspect that if it
appears to work for anyone, it's probably coincidental. Please feel
free to correct me if I'm wrong.
What's confusing about this bug is that it certainly appears to be in
the TCP stack somewhere, but it obviously isn't affecting a
One more thing: I don't think it is the site that causes the problem.
It's just that larger HTTP downloads are more likely to fail due to
increased likelihood of dropped packets.
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I'm experiencing the same issue on my HP Mini Note 2133, both on the
wireless interface (b43) and the wired interface (tg3).
I did some tracing with wireshark and found that a response packet was
being dropped and not resent. It was followed by a duplicate ACK. I
don't know TCP well enough to pr
I had been trying to find a solution to this problem for a week! This
just made my day, thanks!
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unable to visit some websites and ftpsites with 2.6.27
https://bugs.launchpad.net/bugs/264019
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I just Installed firestarter and that fixes both Web surfing and update
manager downloads. Thanks BobbyJean
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unable to visit some websites and ftpsites with 2.6.27
https://bugs.launchpad.net/bugs/264019
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscr
Hi this is my first ever post to a ubuntu / launchpad forum.
I am having the exact same problem with Ubuntu 8.10. I have found that turning
off the spi firewall in my Netgear WPN824 seems to fix it. However the system
update manager is still running very slow.
Everything worked fine in Hardy,
I experience the same bug with Intrepid beta1. Doing a telnet on port
80 to a slow site works. Doing a GET / is extremely slow, less than
100 Bytes per second. Because of this behaviour, any browser I used
(Firefox, Opera, Konqueror) give connection errors.
booting Intrepid beta 1 with a hardy
** Description changed:
2.6.27 introduced a networking issue, leaving sites like youtube.com,
and microsoft.com not working via the web browsers on one of my systems
(but not others). This system, like the others, was upgraded from
Hardy.
I am unable to transfer files from archive.ub
2.6.27-5 still has this bug.
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unable to visit some websites and ftpsites with 2.6.27-2
https://bugs.launchpad.net/bugs/264019
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htt
It's the 2.6.27 kernel that's the problem. Yesterday I tried Fedora 10,
which uses the 2.6.27-* kernel, and had the same problem, but, just like
in Ubuntu, if you install firestarter (I downloaded a copy and saved it
before I installed Fedora) internet surfing is fine. Strange.
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unable to visit
Here's the dmesg from 2.6.27-4-generic. Some sites do not make
functioning connection - including Ubuntu updates via apt.
** Attachment added: "dmesg from 2.6.27-4-generic (some sites will not make
connections)"
http://launchpadlibrarian.net/18146141/dmesg.1
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unable to visit some websites
On an up-to-date Intrepid system with 2.6.27-4 (i386) I am still
experiencing this problem. 2.6.27-2-generic also showed this problem.
When using 2.6.26-5 network connections work correctly.
** Attachment added: "dmesg from 2.6.26-5-generic (network functioning
properly)"
http://launchpadli
Similar problem since 2.6.27 kernel was introduced in Intrepid. I can
connect to some sites, like iGoogle and Yahoo (plus others when I can
find them), but not others (like Ubuntu Forums). I can not do any
updates either in terminal (cursor just sits there blinking with Waiting
for Headers displaye
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