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.
- Browse to the host in the vSphere Web Client navigator.
- Click the Configure tab.
- Under System, click Security Profile, and click Edit.
- Scroll down to an appropriate version of NFS to make sure that the port is opened.