To solve this issue:
Note: If you cannot change the Linux server, you can work around the issue by opening Terminal on your Mac OS X Server computer and using a mount command with a "-P" options flag (for example, mount -o"-P") to mount the Linux volume. However, you must do this each time you add or reinstall a Mac OS X Server as a client to the server. Because NetworkManager doesn't support the "-P" option flag, you must add the option to the NetInfo /mounts entry if you want to use NetworkManager to mount the volume.