[vagrant-up] Portforwarding working but private_network setting not...why?

[sanan]

Hi,

I am new to this group. And have joined with a hope to resolve the issue 
that I am facing for last two days. 

Can you please help me to setup private network configuration in my vagrant 
box. I have windows 10 pro laptop with strong hardware configuration. I am 
connected to wifi. I am able to create base vagrant box with windows 2012 
without any problem. When I run vagrant up. That also goes smooth. But when 
I run vagrant rdp to login into it, it throws following error message:
*C:\V_images\VagrantBoxes\JiraServer>vagrant rdp ==> default: Detecting RDP 
info... RDP connection information for this machine could not be detected. 
This is typically caused when we can't find the IP or port to connect to 
for RDP. Please verify you're forwarding an RDP port and that your machine 
is accessible.*

I have attached my vagrant file, the output from vagrant up command, json 
file that I used to create the base box with packer, vagrant template 
referred in json file and output of ipconfig /all command from my laptop 
(host machine). can you please help to find my mistake? please let me know 
if you need more information.. Please note that if I replace the 
private_network setting with port forwarding setting or keep both, then rdp 
is successfull. Infact after logon I am even able to see the assigned ip 
address in guest machine, though it can not be pinged to, from the host 
machine. But private_network paramenter alone does not work. thanks
sanan

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Vagrant.configure(2) do |config|

    config.vm.box = "xxxx.box"

        config.vm.communicator = "winrm"
        config.vm.hostname = "xxxxserver"       
  
    # Admin user name and password
    config.winrm.username = "vagrant"
    config.winrm.password = "vagrant"
        
        config.vm.guest = :windows
    config.windows.halt_timeout = 600

        
        config.vm.network "private_network", ip: "172.28.128.5"
        
end

vagrantup.output
Description: Binary data

windows_2012_r2_headlesstrue_noupdate_nocompact.json
Description: application/json

vagrantfile-windows_2012_r2.template
Description: Binary data

ipconfigall.output
Description: Binary data