If you encounter the following error and are sure that your NFS server firewall is ocnfigured properly or disable
mount: mount to NFS server 'hostname' failed: System Error: Connection refused
You might want to try this this
esxcfg-firewall -e nfsClient
If you encounter the following error:
mount.nfs Input/output error
You might want to check your portmap status and start it if is stopped.
Check ths status
service portmap status
Start the service
service portmap start
