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Failing to connect to linux (Centos 7) via SSH Putty, when Linux is idle for about 2 hours

I am failing to login to linux Centos 7 via SSH if the SSH session becomes idle for about 2 hours. Even if i restart the sshd service it wont connect, i get the "Connection refused error" and to resolve this i am forced to restart the linux server. The linux box is on Centos 7, and its hosted on VMware.

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