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 Client, navigate to the ESXi host.
- Click the Configure tab.
- Under System, click Firewall, and click Edit.
- Scroll down to an appropriate version of NFS to make sure that the port is open.