To enable access to NFS storage, ESXi automatically opens firewall ports for the NFS clients when you mount an NFS datastore. For troubleshooting reasons, you might need to verify that the ports are open.
- In the vSphere Web Client, select the ESXi host.
- Click the Manage tab, and click Settings.
- Select Security Profile in the System area, and click Edit.
- Scroll down to an appropriate version of NFS to make sure that the port is opened.