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    SubjectRe: 2.1.103 won't connect to ftp.kernel.org
    On Sun, May 31, 1998 at 05:32:01PM +0200, Carsten Gross wrote:
    > Hello Andi and Developer list
    >
    > [Cc'ed to the List]
    >
    > Thanks for your answer.
    >
    > In article <k2ogwemx8u.fsf@zero.aec.at>,
    > ak@muc.de (Andi Kleen) writes:
    > [Description of my problem...and:]
    > > Now it starts to be come strange. The other end floods us with ACKs.
    > >
    > > Can't see yet why. Is this reproducible? If yes, could you change ncftp
    > > to set the SO_DEBUG option on the socket
    >
    > Yes, it is reproducible. I've fetched ncftp 2.4.3 (This version is a lot
    > newer than my installed version) from a redhat mirror at
    > ftp.rz.uni-karlsruhe. This server isn't a problem for me at all, I
    > downloaded the 200 kbyte in one or two minutes.
    >
    > I compiled ncftp with the following line added around Row 494 (and at the
    > top of the function, I set int flag = 1):
    >
    > if (setsockopt(sockfd, SOL_SOCKET, SO_DEBUG, &flag, sizeof(flag))<0) {
    > perror("setsockopt");
    > exit(1);
    > }
    >
    > This version of ncftp has a timeout handling. It stops itselfs connecting
    > after 30 seconds, but the problem remains:
    >
    > python:/home/carsten/ncftp-2.4.3#./ncftp ftp.kernel.org
    > (hanging, the prompt returns after 30 seconds with exit status 7)


    [...]

    That's very strange. Could you try to turn off RFC1323
    (echo 0 > /proc/sys/net/ipv4/tcp_rfc1323), SACK (the same for
    tcp_sack) and pmtu discovery (echo 1 > ..../ip_no_pmtu_disc)

    It would be interesting if any combination of these flags works.

    The only thing that looks strange in your packet are the timestamps,
    maybe the PAWS old packet check discards them.

    -Andi


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