[see http://www.uwsg.indiana.edu/hypermail/linux/net/9811.2/0031.html]

I have also been seeing this problem intermittently.  I am running
RedHat 5.2.
Relevant packages: apache-1.3.3-1, kernel-2.0.36-0.7, glibc-2.0.7-29.
Ethernet card: 3c59x driver on 3c905-B.

Symptom: apache is running on 209.66.78.11.  The first time I connect to
it from any machine (tested on Linux and NT, Netscape and IE), I get the
Netscape pop-up (or IE equiv) saying:

A network error occurred while Netscape was receiving data.  (Network
Error: Connection reset by peer)

(If you know why this happens, please let me know; below I include more
data for others trying to figure this out.)

Hit reload and it works fine, but if the page is reloaded enough times
(1 minute apart, 5 to 30 min later), it can happen again.  I set up
tcpdumps at client and server and caught it in the act.  The tcpdumps
are below.  The problem is in lines 2&4 of the client tcpdump. The
client sees two SYN packets from the server, one right after the other,
with radically different sequence numbers.    The server only notices
sending out the SECOND one, so ACKs to the first one confuse it into
sending a RESET.

Similarities/differences with Michael Talbot-Wilson's experience:

similar
- my machine does answer to a DNS record that is internal-only (unknown
to internic)

different
- my machine is only bound to one IP address
- no virtual hosts in apache conf

For now, I am going to try the ol' reboot and see if it goes away.

I would love to hear any ideas on this one!!!

Thanks
-Elliot Poger


server sees:
10:27:15.686603 205.218.129.29.10570 > 209.66.78.11.80: S
3634885468:3634885468(0) win 512 <mss 1460>
10:27:15.686603 209.66.78.11.80 > 205.218.129.29.10570: S
1715406934:1715406934(0) ack 3634885469 win 32736 <mss 1460>
10:27:15.696603 205.218.129.29.10570 > 209.66.78.11.80: . ack 2579579807
win 32120 (DF)
10:27:15.696603 205.218.129.29.10570 > 209.66.78.11.80: . ack 2579579807
win 32736 (DF)
10:27:18.686603 209.66.78.11.80 > 205.218.129.29.10570: S
1715406934:1715406934(0) ack 3634885469 win 32736 <mss 1460>
10:27:18.686603 205.218.129.29.10570 > 209.66.78.11.80: . ack 2579579807
win 32736 (DF)
10:27:18.696603 205.218.129.29.10570 > 209.66.78.11.80: . ack 2579579807
win 32736
10:27:18.696603 209.66.78.11.80 > 205.218.129.29.10570: R 19445:19445(0)
win 0

client sees: (~5 min clock skew)
10:22:41.779373 205.218.129.29.10570 > 209.66.78.11.80: S
3634885468:3634885468(0) win 512 <mss 1460>
10:22:41.799373 209.66.78.11.80 > 205.218.129.29.10570: S 19444:19444(0)
ack 3634885469 win 0 (DF)
10:22:41.799373 205.218.129.29.10570 > 209.66.78.11.80: . ack 1 win
32120 (DF)
10:22:41.799373 209.66.78.11.80 > 205.218.129.29.10570: S
1715406934:1715406934(0) ack 3634885469 win 32736 <mss 1460>
10:22:41.799373 205.218.129.29.10570 > 209.66.78.11.80: . ack 2579579807
win 32736 (DF)
10:22:44.789373 209.66.78.11.80 > 205.218.129.29.10570: S
1715406934:1715406934(0) ack 3634885469 win 32736 <mss 1460>
10:22:44.789373 205.218.129.29.10570 > 209.66.78.11.80: . ack 2579579807
win 32736 (DF)
10:22:44.799373 205.218.129.29.10570 > 209.66.78.11.80: . ack 2579579807
win 32736
10:22:44.809373 209.66.78.11.80 > 205.218.129.29.10570: R 19445:19445(0)
win 0
10:22:50.809373 209.66.78.11.80 > 205.218.129.29.10570: S
1715406934:1715406934(0) ack 3634885469 win 32736 <mss 1460>
10:22:50.809373 205.218.129.29.10570 > 209.66.78.11.80: R
3634885469:3634885469(0) win 0
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