[CentOS] Openssh connection closes from time to time. why?

Eliezer Croitoru eliezer at ngtech.co.il
Thu Jan 3 13:35:03 UTC 2013

Sorry my Bad.
The local dhcp server of the router is broken and causes a deny for the 
dhcp-ack for about 5 secs and that causes the machine to drop the IP 
lease for about 5 secs.

If someone want OpenSSH v6.1p1 I have a RPM on my repo.


On 1/3/2013 9:45 AM, Eliezer Croitoru wrote:
> Hey there,
> I just replaced long lived Gentoo to a Centos 6.3 on 2 servers.
> Since the move I had troubles with ssh open sessions.
> I am connecting from a windows machine via putty and then all of a
> sudden it saying something about connection closing.
> The OpenSSH version is: openssh-server-5.3p1-81.el6.x86_64.rpm
> I tired to configure:
> tcp_keep_alive
> TCPKeepAlive yes
> ClientAliveInterval 240
> ClientAliveCountMax 50
> Each one of them or all together seems to not solve the problem.
> It's not iptables issue since it was stopped and disabled.
> If someone have an idea of what can be done or checked I will be happy
> to hear about it.
> For now I have created a custom OpenSSH-6.1p1 RPM just in case it will
> might help.
> Both server has the same issue while another Fedora machine runs by
> which doesn't have the same issues.
> They are both connected to the same switch and seems to be fine.
> Thanks,
> Eliezer
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