I was trying to setup key based login instead of password method, but things went wrong and now when I want to ssh to the esxi node, I get public key error (access denied) and I can not even use password for sshing. See this topic.
I can access the esxi web page (where I see administrations and VMs) by directly entering the node's ip or vcenter.
If there is no way, I have to directly use KVM and monitor to enter the direct terminal of the node but it takes some days.
If I can bring up a terminal from the esxi web page, I guess it will be fine. But didn't find such option in the menus.