On 15/08/2022 14:31, Viktor Dukhovni via Exim-users wrote:
I strongly suspect this is a known issue with interactions between Exim and TFO causing machines to ignore packets, which was reported in this thread:https://lore.kernel.org/lkml/E1nZMdl-0006nG-0J@plastiekpoot/ I tracked it down to a conntrack bug and suggested a fix, and the conntrack maintainers checked in an expanded fix here: c7aab4f17021b netfilter: nf_conntrack_tcp: re-init for syn packets only https://lore.kernel.org/netdev/17c87824-7d04-c34e-bf6a-d8b874242...@tmb.nu/t/#mab1f2792ba24e98e3f41468c9781747a77c87ac9 Can you please advise folks who run into this to upgrade to Linux v5.18 or later (since it has the fix) or to cherry-pick in that fix?
Marc, the best route will be for you to open a Debian bug including the above. According to https://www.debian.org/Bugs/Reporting there is a utility "reportbug" to use. -- Cheers, Jeremy -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
