I have sent this question to 3 other mailing lists already without
success, so hopefully there is an answer related to kernel that can be
answered here. For some strange, unidentifiable reason, I cannot reach
certain sites through any web browser. Pinging the site responds well, as
does traceroute, and telnetting to port 80 on the machine connects me to
the site. However, once connected, no web commands are working, and any
programs simply hang at this point. Using lynx (as an example; all web
browsers on my machine have this problem), a connection is established,
but the program hangs on "HTTP request sent; waiting for response." I have
waited overnight for a response, but it stays at that point.
I have tested this in any way I could think of. I have telnetted to other
Linux machines, and found that they can reach the site without
difficulty. I have tried using my other computer, which shares the phone
line, internet account and settings, but runs Windows 98. Again, no
difficulty. I have removed all software that might be acting as a
firewall, removed local DNS services and have rebooted to verify that it
is not a cache issue. I have also checked the FAQ, and tried to follow the
directions for problems with ECN, but do not have a file named
/proc/sys/net/ipv4/tcp_ecn. (I am using devfs, if that makes a
difference.)
If this is not a kernel issue, then I hope someone can direct me to some
other way of fixing this problem. If a solution cannot be offered, then
advice about how to trace this problem would also be welcomed.
Here is a partial list of sites that I have had problems with. Note that
once I find one of these sites, it is consistantly unreachable, even with
sites found months ago.
http://www.codewarrioru.com
http://www.backwire.com
http://www.counterpane.com
http://www.zip2it.com
Thank you for any help you might be able to provide.
----
Jonathan Eisenstein
[email protected]
PGP Public Key: http://www.mindspring.com/~jeisen/pgp.asc
Jon Eisenstein wrote:
> Here is a partial list of sites that I have had problems with. Note that
> once I find one of these sites, it is consistantly unreachable, even with
> sites found months ago.
i had a try with Linux-2.4.2 Mozilla 0.8
> http://www.codewarrioru.com
time out answer (pingable however)
> http://www.backwire.com
connection refused with ECN.
echo '0' > tcp_ecn makes it reachable. Mozilla sucks (CPU99%) and does
not display the page in a reasonable time (maybe a problem i have with
java and glibc-2.2.2)
> http://www.counterpane.com
no problem with this one.
> http://www.zip2it.com
un-resolved (could it be http://www.zip2.com)
--
------------------------------------------------
Pierre Rousselet <[email protected]>
------------------------------------------------
> i had a try with Linux-2.4.2 Mozilla 0.8
> > http://www.codewarrioru.com
> time out answer (pingable however)
Reachable on my windows machine. There may have been some confusion here
-- it is not on a network. The two computers are in different rooms but
share a phone line, regular dial-up modems.
> > http://www.backwire.com
> connection refused with ECN.
> echo '0' > tcp_ecn makes it reachable. Mozilla sucks (CPU99%) and does
> not display the page in a reasonable time (maybe a problem i have with
> java and glibc-2.2.2)
Here are the tcpdumps for two sites. Note that both are complete, with 12
and 8 packets tracked respectively. Normal sites have at least 150 packets
for me.
23:08:44.811245 63.53.132.224.3466 > 64.14.114.71.www: S 964278824:964278824(0) win 2144 <mss 536,sackOK,timestamp 71732491 0,nop,wscale 0> (DF)
23:08:44.976314 64.14.114.71.www > 63.53.132.224.3466: S 89259702:89259702(0) ack 964278825 win 16616 <mss 1460,nop,nop,timestamp 0 0,nop,nop,sackOK> (DF)
23:08:44.976518 63.53.132.224.3466 > 64.14.114.71.www: . ack 1 win 2144 <nop,nop,timestamp 71732508 0> (DF)
23:08:44.984338 63.53.132.224.3466 > 64.14.114.71.www: . 1:501(500) ack 1 win 2144 <nop,nop,timestamp 71732508 0> (DF)
23:08:44.984763 63.53.132.224.3466 > 64.14.114.71.www: P 501:678(177) ack 1 win 2144 <nop,nop,timestamp 71732508 0> (DF)
23:08:45.286316 64.14.114.71.www > 63.53.132.224.3466: . ack 678 win 16616 <nop,nop,timestamp 90878784 71732508> (DF)
23:08:45.426324 64.14.114.71.www > 63.53.132.224.3466: . 1049:1073(24) ack 678 win 16616 <nop,nop,timestamp 90878785 71732508> (DF)
23:08:45.426489 63.53.132.224.3466 > 64.14.114.71.www: . ack 1 win 2144 <nop,nop,timestamp 71732553 90878784,nop,nop,sack sack 1 {1049:1073} > (DF)
23:08:48.646309 64.14.114.71.www > 63.53.132.224.3466: . 525:537(12) ack 678 win 16616 <nop,nop,timestamp 90878817 71732553> (DF)
23:08:48.646482 63.53.132.224.3466 > 64.14.114.71.www: . ack 1 win 2144 <nop,nop,timestamp 71732875 90878784,nop,nop,sack sack 2 {525:537}{1049:1073} > (DF)
23:08:55.206303 64.14.114.71.www > 63.53.132.224.3466: . 525:537(12) ack 678 win 16616 <nop,nop,timestamp 90878883 71732875> (DF)
23:08:55.206484 63.53.132.224.3466 > 64.14.114.71.www: . ack 1 win 2144 <nop,nop,timestamp 71733531 90878784,nop,nop,sack sack 3 {525:537}{525:537}{1049:1073} > (DF)
> > http://www.counterpane.com
> no problem with this one.
And for this:
23:12:57.726945 63.53.132.224.3479 > 208.42.65.154.www: S 1237658684:1237658684(0) win 2144 <mss 536,sackOK,timestamp 71757783 0,nop,wscale 0> (DF)
23:12:57.976374 208.42.65.154.www > 63.53.132.224.3479: S 3499622070:3499622070(0) ack 1237658685 win 8908 <nop,nop,timestamp 2835260985 71757783,nop,wscale 0,nop,nop,sackOK,mss 536> (DF)
23:12:57.976576 63.53.132.224.3479 > 208.42.65.154.www: . ack 1 win 2144 <nop,nop,timestamp 71757808 2835260985> (DF)
23:12:57.984439 63.53.132.224.3479 > 208.42.65.154.www: . 1:501(500) ack 1 win 2144 <nop,nop,timestamp 71757808 2835260985> (DF)
23:12:57.984854 63.53.132.224.3479 > 208.42.65.154.www: P 501:681(180) ack 1 win 2144 <nop,nop,timestamp 71757808 2835260985> (DF)
23:12:58.336375 208.42.65.154.www > 63.53.132.224.3479: . ack 501 win 8908 <nop,nop,timestamp 2835261021 71757808> (DF)
23:13:03.876409 63.53.132.224.3479 > 208.42.65.154.www: P 501:681(180) ack 1 win 2144 <nop,nop,timestamp 71758398 2835261021> (DF)
23:13:04.166373 208.42.65.154.www > 63.53.132.224.3479: . ack 681 win 8908 <nop,nop,timestamp 2835261605 71757808> (DF)
> > http://www.zip2it.com
> un-resolved (could it be http://www.zip2.com)
This one was off of the top of my head. Turns out I was referring to
http://www.zap2it.com, and apparently, that was a one-time problem. That was just
the proverbial straw that broke the camel's back.
----
Jonathan Eisenstein
[email protected]
PGP Public Key: http://www.mindspring.com/~jeisen/pgp.asc