The ESXi host Secure Shell (SSH) daemon must set a timeout interval on idle sessions.

Automatically logging out idle users guards against compromises via hijacked administrative sessions.

From an ESXi shell, run the following command:

# /usr/lib/vmware/openssh/bin/sshd -T|grep clientaliveinterval

Expected result:

clientaliveinterval 200

If the output does not match the expected result, this is a finding.

From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":

ClientAliveInterval 200