Re: Strange behaviour for kernels > 6.12.x

Michel Verdier <[email protected]> writes:

> On 2026-06-06, Greg Wooledge wrote:
>
>> I keep thinking it's probably something in the networking code.  I'm
>> reminded of TCP Window Scaling, which caused a bunch of problems when
>> it was newly introduced.  Devices which were not properly configured
>> sometimes could not communicate properly with Linux systems that had
>> TCP Window Scaling enabled.  (This was not a bug in Linux.  It was a
>> common bug or misconfiguration in other systems.)
>
> Yes it could also be a security patch enforcing a new control which
> fails. It could be apparmor denying access, etc. This is why I suggest to
> look in the system logs. Looking in inn2 logs and dovecot logs could be
> useful too.

But, as I said: this happens after some time. When I have fresh
connection gnus-> inn2 it works.


KJ