I have a Centos 7.4.1708 installation on my server which hosts a few KVM instances.
From last week i am facing an issue on my server.
Whenever I connect to server via ssh it just gets disconnected and the ICMP reply get timed out.
However all the VM's installed on the server is accessible and running fine. First I thought it would be some network issue so I changed network cable, switched network ports, update to the latest Centos release and also try stopping firewalld. But the issue is still the same.
Than I thought there was some kind of network crunching going on so I powered off some VM's to see if that resolves the issue, but with no success.
And also there was an incident in my network. Last week when i logged in to my server there were 68 failed login attempts through ssh on the server from other user's Ubuntu Desktop. So i quickly ran
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I need to resolve this issue by the end of this week.