When you install the VMware ESXi hypervisor, a series of services are present on it, only a part of which is running normally.
To authorize and secure access to these different services, a firewall is pre-installed and pre-configured on your VMware ESXi hypervisor. This allows by default to block ports currently unused by your hypervisor.
To see the list of services installed on your VMware ESXi hypervisor and manage them, connect to its web interface, then go to : Host -> Manage.
In the "Services" tab, you will find the list of services present on your VMware ESXi hypervisor, along with their status and the firewall rule associated with it.
Indeed, with VMware ESXi, it's possible to manage the opening and closing of specific ports of the firewall according to the state of the associated service.
So, when you stop a service, the port is automatically closed in the VMware ESXi firewall.
In the list of services, you will find in particular :
For each service, you can start, stop or restart it manually.
Then, if you click on "Actions", you will be able to change the start and stop policy to be used with a specific service :
For some services (including "ntpd"), you can access the corresponding rule in the firewall by clicking on the link in the "Firewall rule" column.
For this "ntpd" service, the rule is named "ntpClient".
By clicking on this link, you will be automatically redirected to the "Networking -> Firewall rules" section of this web interface and the name of the desired rule will automatically be shown in the search box so that it appears directly on the screen.
To manage the firewall rules for your VMware ESXi hypervisor, go to : Networking -> Firewall rules.
As you can see, by default, more than 40 rules are pre-configured. But, some of them are disabled (grayed out) by default.
Among the rules available by default, you will find in particular :
To edit a rule for this firewall, select it and click "Edit settings".
In the "Firewall Settings" window that appears, you can choose between :
To limit access to ports affected by this firewall rule, select "Only allow connections from the following networks" and enter the network(s) and/or IP address you want to allow.
Here are some examples :
As stated previously, some rules of this firewall are enabled and some are not. Those displayed in black are enabled and those displayed in gray are disabled.
For each rule of this firewall, you can click on "Actions" to :
When a service is associated by VMware ESXi with a specific rule of its firewall, you can also access the "Service" submenu of the "Actions" menu.
In this case, you can start, stop or restart the service associated with it.
Then, in the "Policy" submenu, you can choose whether the associated service should start and stop automatically according to this firewall rule, from the start and stop of the host or manually.
For more information on these 3 possibilities, refer to the explanations given in the previous step of this tutorial.
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