1、使用了非法端口,也就是使用了大于1024的端口。
这个错误,可以通过查看日志确认:
[root@local~ /]# cat /var/log/messages | grep mount
Jan 2 12:49:04 localhost mountd[1644]: refused mount request from 192.168.0.100 for /home/nfsshare/ (/home/nfsshare): illegal port 1689
secure,This option requires that requests originate on an Internet port less than IPPORT_RESERVED (1024). This option is on by default. To turn it off, specify insecure.