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Date: Wed, 20 Jan 2016 10:14:17 +0000 From: "bugzilla-dae...@bugzilla.kernel.org" <bugzilla-dae...@bugzilla.kernel.org> To: "shemmin...@linux-foundation.org" <shemmin...@linux-foundation.org> Subject: [Bug 111041] New: random openssh connection failure during connection to server https://urldefense.proofpoint.com/v2/url?u=https-3A__bugzilla.kernel.org_show-5Fbug.cgi-3Fid-3D111041&d=CwICaQ&c=IL_XqQWOjubgfqINi2jTzg&r=q_lvUiVm1uM6QEw9TPH-6jiV__hsrE6xXUAtATPE9x0&m=Jk3RwPbncUW6RyLfcTeu44MAZ0LFZm_HFxRIcPFJaEs&s=Jrbgmvu1hu8KrQlA3sTLXDCgTkW3xtWM9UuXUmMnf9M&e= Bug ID: 111041 Summary: random openssh connection failure during connection to server Product: Networking Version: 2.5 Kernel Version: 4.4.0 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: IPV4 Assignee: shemmin...@linux-foundation.org Reporter: hydrapo...@gmail.com Regression: No It's sometimes impossible to connect to a server running Gentoo Linux with kernel 4.4 using ssh. The problem is only the connection, it fails a few times but then it goes fine and ssh works as expected. OpenSSH_7.1p2-hpn14v10, OpenSSL 1.0.2e 3 Dec 2015 debug1: Reading configuration data /etc/ssh/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to 10.0.0.5 [10.0.0.5] port 22. debug1: Connection established. debug1: Enabling compatibility mode for protocol 2.0 write: Connection reset by peer Or alternatively it fails with "ssh_exchange_identification: read: Connection reset by peer". We were able to reproduce this problem with random clients, Gentoo, Ubuntu, Debian, random kernels. It's interesting that only 1 client doesn't have a problem to connect to the server - a system with Gentoo Linux Hardened 4.1 (using the same openssh version). The server is a Supermicro X10DRW, Intel PCI-Express Gigabit Ethernet (igb) networking. Two ethernet ports were connected to bond and that to a bridge for xen. I've also tried without bond and without any iptables rules, it didn't help. This setup works without any modification on kernel 4.1.15. A Gentoo forum post: https://urldefense.proofpoint.com/v2/url?u=https-3A__forums.gentoo.org_viewtopic.php-3Fp-3D7868744&d=CwICaQ&c=IL_XqQWOjubgfqINi2jTzg&r=q_lvUiVm1uM6QEw9TPH-6jiV__hsrE6xXUAtATPE9x0&m=Jk3RwPbncUW6RyLfcTeu44MAZ0LFZm_HFxRIcPFJaEs&s=SuurWudhyHYuvvaWUtAMY_Yihv7qKIBzXVesBCNhj04&e= -- You are receiving this mail because: You are the assignee for the bug.
