Have you enabled keepalive in imapd.conf?
tcp_keepalive: 1
--
.:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
.:.Regionales Rechenzentrum (RRZK).:.
.:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
Am 16.03.20 um 16:13 schrieb Heiler Bemerguy:
> Hey Guys,
>
> I have seen this on my Cyrus server 2.5.10, which is preventing new
> users on IMAP:
>
> root@mailer:~# netstat -na |grep 177.194.176.48 |wc -l
> 27
> root@mailer:~# netstat -na |grep 177.194.176.48
> tcp 0 0 10.1.200.226:143 177.194.176.48:56330
...
>
> Not even a single byte is sent to this IP (as seen on tcpdump), and this
> Debian's tcp keepalive is set like:
>
> net.ipv4.tcp_keepalive_intvl = 5
> net.ipv4.tcp_keepalive_probes = 3
> net.ipv4.tcp_keepalive_time = 60
>
> And there's an iptables rules like this:
>
> iptables -A INPUT -p tcp --syn --dport 143 -m connlimit
> --connlimit-above 10 --connlimit-mask 32 -j REJECT
> iptables -A INPUT -p tcp --syn --dport 143 -j ACCEPT
>
> Even though this user is multiple connected like that for HOURS.......
>
> --
> Best Regards,
>
> Heiler Bemerguy - CINBESA
> Analista de Redes, Wi-Fi,
> Virtualização e Serviços Internet
> (55) 91 98151-4894
>
>
> ----
> Cyrus Home Page: http://www.cyrusimap.org/
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