On Tue, Dec 29, 2020 at 06:03:10PM +0700, Victor Sudakov via Exim-users wrote:
> Evgeniy Berdnikov via Exim-users wrote:
> > On Tue, Dec 29, 2020 at 10:20:51AM +0700, Victor Sudakov via Exim-users wrote:
> > > The packet dump is available at http://admin.sibptus.ru/~vas/2.pcap
> > > You can see from it that exim's host opens a TCP connection to the
> > > clamav host, the clamav host replies with SYN+ACK, but the exim host sends a TCP RST
> > > immediately. Why could that happen?
> >
> > Normally tcp connection initiator should respond with ACK to SYN+ACK.
>
> Have you looked at the actual packet dump? I mean, don't trust my word.
Yes, I have. And have you looked at packet time stamps?
IMHO, 3-5 us time interval between SYN-ACK and RST is
too low for userspace responce.
However, get strace as Jeremy suggested.
I expect ECONNREFUSED on connect().
--
Eugene Berdnikov
