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-d8b874242636@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
