Raidar 6.4.0 not locating NAS

What I would do is log into my Router and locate your NAS that way.  See what IP number it was assigned.  Generally, you can figure out which IP it is.   If you know the MAC number of the NAS, it's even easier to figure out.  If you have 2 or more Ethernet ports. the MAC address will be almost the same, just 1 digit off.

Once you know what the IP number is, you can just enter that number into your browser and get on it that way.  Myself, I went into my Router and locked the IP number I wanted to use for my NAS is it never changes.  Otherwise, it can as DHCP in your router auto assigns IP numbers as devices connect to it.  So my IP number of my NAS is 10.0.0.100 and 10.0.0.101.  I set my Router to give those Static IP numbers to my NAS.  It has 2 Ethernet ports. So 2 Numbers, 1 to each MAC address.  The MAC address looks something like 23:10:07:12:43:21.  Your Second Ethernet port may be something like 23:10:07:12;43:22.  Every Wired Ethernet port has it's own MAC address.  No 2 are the same.  Even for Wifi.  Your Wifi has it's own MAC address also. So if you have a device with a Wired Port and Wifi, there's a different MAC address for each of those.  

Most of my devices I have created a Static IP number for.  I find it makes for a more stable, problem free network!!!  It also makes it simpler to find something.  I know the IP address of most of my devices off hand.   My other NAS is using 10.0.0.110 and 10.0.0.111.   In my router, I can give basic names to each device I have an IP address for.  So I know what all my many devices that are connected to my network are.  From my Windows Desktop to my NAS, and even my iPad.   So when something NEW pops up, it's simpler to figure out what that is.  

I never use Raidar.  Or for my QNAP, they have Qfinder Pro.  I have no need for either of them.  To me they're pointless.   I guess they exist for a noobie.   If you don't know much about Networking, I guess they're useful.   Helping you find your device.  If you're always using it as your NAS is always changing IP address.  It will change if your NAS goes back off, or reboots and your router assigns it some other address using DHCP. (Dynamic Host Configuration Protocol)    As devices connect and disconnect for whatever reason, IP address change, UNLESS you have assigned a device it's own static IP number which will always be used and only used for the device you assign it to.  So every time I type or click on the link to 10.0.0.100, I know my ReadyNAS will be there.  ALWAYS!!!