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    From
    SubjectRe: 2.4.0 tcp over firewall - no connection
    Date
    In article <m3itnnru8n.fsf@belphigor.mcnaught.org>,
    Doug McNaught <doug@wireboard.com> writes:

    >> I noticed rather strange behavior: stock 2.4.0 with old ISA 3Com
    >> on UP compiled as UP cannot open TCP connection to hosts behind a
    >> firewall. E.g. it is impossible to go to http://www.etrade.com/ -
    >> connect just never finishes. 2.2.17 on the same hardware works
    >> right. 2.4.0 on SMP over PPP connection works right too. MTU
    >> is 1500 in both cases. In both cases, kernel is compiled with
    >> netfilter as modules, but those are not loaded.
    >
    > Known problem, exhaustively discussed on the list, and not related
    > to your NIC. Disable ECN (explicit congestion notification), either
    > in your kernel compile or in /proc/sys/<something>.

    This really was ECN, sorry for noise in this list...

    Eugene
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