SYN_ACK issue as r-proxy with SSL and non SSL vhosts

Hello,

I have a reverse proxy serving both SSL and non SSL.

When I serve a HTTPS host, SSL termination and forwarding works well.

When I serve a HTTP host, forwarding is lost in missing SYN_ACK.

I’ve added default backlog=1024 on every listen to no success.

Any hint ? idea ?

O.S.: raspberry with debian, cubieboard2 with cubian
nginx: raspi: 1.2.1 / cubie: 1.6.0
http hosts behind: perl dancer, domoticz…

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