Centos 7 diskless client cannot mount NFS

I've spent the last few days leaing how to set up a diskless client in a couple virtualbox machines, following the guide in the RHEL documentation. So far I have made it through the whole guide, but I can't get the client's keel to mount the NFS share to finish booting; the connection is always timing out. But my problem is that I can't figure out why.

Server:

• Centos 7.2
• Local IP 10.0.2.15
• NFS, DHCP, TFTP
• Firewall zone: trusted (allow all connections)
• SELinux: Permissive (allow all access)

Client:

• Local IP 10.0.2.20
• Keel: Copy from server install
• File system: Copy of server install

Here are my configs for tftp, dhcp and nfs:

Currently the error I get is dracut-initqueue[258]: mount.nfs: Protocol not supported

Previously I got mount.nfs: Connection timed out

What baffles me about the connection continually timing out is that I shouldn't have anything blocking network connections. The iPXE boot rom can obviously reach the server because it's receiving DHCP instructions and booting into initrd. The NFS server is running and unblocked by the firewall and SELinux. It seems to me the services are all pointing to the right location, the right permissions, the right IP. I can't seem to find what's blocking the connection. I would be grateful for any insight.

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