Can't map a drive to a "Server 2012 R2 using server name

I just installed a Server 2012 R2 Server
- fully updated with all Microsoft updates
- setup the server as a standalone "peer to peer" server in a workgroup. No immediate needs for Active Directory
- set up a user account
- created a folder called SHARED and provided full control for Shared and Security
- I did not enable Network Discovery
- confirmed network is set to "Private Network"
- teamed the two NICs with static private IP address - using Windows team
- I can ping the server from any workstation - I had to enable this feature on the server's firewall

From a Windows 7 Pro PC, I attempted to map a drive to \\servername\shared  - it fails with message that it cant fine the server.
- attempted using the user server account and the server's administrator's account
- However, I can map a drive using the IP Address \\\shared. It connects successfully
- the PC is getting DHCP for DNS from the Comcast router/gateway. We are planning to set up a firewall before going live

From a Windows 10 Pro Laptop, I had the same issue but finally mapped a drive to \\servername\shared

I am a Server 2008 R2 expert but not familiar with server 2012 R2 or Server 2016

Tried googling this issue but nothing that really helped

Not sure if I'm missing a feature to enable that's different on 2012r2 vs. 2008r2

Any help would be appreciated
Andreas GieryicComputer Networking, OwnerAsked:
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DamianIT incCommented:
Do you see the share if you do a 'net use' ?
PatSenior Network AnalystCommented:
Hello agieryic,

A few things. We know IP is working as you can map using the IP address, so it's just the name resolution. Most likely no windows firewall issues.

1) make sure they are in the same workgroup name, and verify that the NETBIOS server name is the same you are trying to map (on the server, you can also issue nbtstat -n to verify the name)
2) from a command line, on your win7, do nslookup SERVERNAME (change SERVERNAME for the Netbios  name)

this should help in troubleshooting this issue... I believe.
Good luck!
DamianIT incCommented:
Probably worth disabling WINS too, for a trial and error.
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Andreas GieryicComputer Networking, OwnerAuthor Commented:
As soon as I get back to my computer I'm going to test your suggestions thanks
Shaun VermaakTechnical SpecialistCommented:
Can the Comcast router/gateway resolve the server name? The other PC might be getting name via network browser
I would install DNS on that server, add the Comcast router/gateway as a DNS forwarded then change DHCP to dish out this server as DNS to all clients
Andreas GieryicComputer Networking, OwnerAuthor Commented:
I want to keep the network very simple right now. I have only 4 users. They originally had Server 2008 R2 configured basically the same as this newer server and it was working well for years. I totally understand the reasons for Active Directory and most likely, will be using it - but not until I get more comfortable with Server 2012 R2

Currently, users are sharing data from a local Windows 7 PC on the same network - until the server is ready
I want to reply as soon as I can - however, the users will be on their computers all day. I will resume after hours tonight. Thanks for the feedback so far.
DonNetwork AdministratorCommented:
You need either DNS or WINS for the other pc's to locate the server by name. You could edit the host files on each of the PC's and then try.
Andreas GieryicComputer Networking, OwnerAuthor Commented:
I will be on site tonight. Never had to do anything with WINS.
On all another peer to peer networks, I pointed DNS to the Comcast router. I will test adding out own firewall router that provides the DNS and DHCP. I'm just wondering if this is a known issue with Server 2012 r2. I dont see this issue with Server 2008 R2
Andreas GieryicComputer Networking, OwnerAuthor Commented:
-      I am able to map successfully via IP Address \\10..1.5.2\SHARED. But it fails connection via \\LEDYARDRAY-SVR\SHARED
-      NET USE command did not work. Placed David’s PC into the same workgroup I created for the server “LEDYARDRAY-GRP”. Did not help
-      Performed nbtstat –n for the server. This confirmed the server’s NetBIOS name. the server name has a hyphen. Not sure if this is causing any concerns “servername-svr”
-      From the workstation, performed nslookup servername-svr.
-      It comes back Server:   Address: 2001:558:feed:=1  can’t find server
-      When I perform the Windows Network Diagnostics, it comes back with “Windows can’t find a server or device named “ServerName-SVR”, shows as detected. Then says, “Windows can communicate with the server name resolution server but can’t find the host name.

I'm going to take a look at the Comcast Gateway
Shaun VermaakTechnical SpecialistCommented:
Yes, external DNS won't have records for your local devices. This is why I recommended a local DNS server
Andreas GieryicComputer Networking, OwnerAuthor Commented:
It started working intermittently after I enabled and started the "Computer Browser" then stopped again.
At this point, I think its best not to only install DNS as suggested but AD as well.  Do you think this is the best move?
Shaun VermaakTechnical SpecialistCommented:
Yes, set up as AD + DNS and even DHCP if you want

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Andreas GieryicComputer Networking, OwnerAuthor Commented:
I set up Active Directory with DNS and DHCP and it appears to be working
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