Quote from: kryztoval on October 06, 2017, 10:17:02 AM

Regarding my network issue, it seems it is a problem with linux and TCP_DEFER_ACCEPT

as explained here:
https://labs.ripe.net/Members/gih/the-curious-case-of-the-crooked-tcp-handshake

I'll keep investigating.

I don't think it's because of this, since handshaking/connection-establishment is working fine. What is happening is that at some point zm calls recv but the connection has been dropped, most probably by your router. You might log the network traffic with tcpdump for the stratum ports you're connecting to and pm them to me, I'll take a look if I can find something. You could also check kernels tcp keepalive settings in /proc/sys/net/ipv4/tcp_keepalive_..... . they might help with nat-routers.