Mac OS X Automount resvport Option

• Symptom: Mac OS NFS client cannot to connect to Linux NFS server, show error message like "Operation is not permitted.."

• Reason: If the Linux NFS server exports with secure option, it means it will only listed to requests coming from ports 1-1024 on the client, so that a malicious non-root user on the client cannot come along and open up a spoofed NFS dialogue on a non-reserved port.

• Solution: add resvport option on the Mac OS X client. for example:
  • nfsserver -detaults,resvport nfsserver:/exports/data