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I have set up window server 2012 R2 as domain controller for Remote desktop service

for some reason, it keep disconnecting the internet after a few hours(sometimes after one day), but when I troubleshoot or disable the adapter and enable again, then it will connect again, when I troubleshoot it, it sometimes show the default gateway not available

I have set the statics local IP and try many other different setting, but it doesn't help. see the setting on the images below:

https://www.dropbox.com/s/3ixjuq5fr2w4hyg/1.jpg

https://www.dropbox.com/s/qhudzqrp3mk4ej4/2.jpg

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When the issue happens, please attempt to ping the gateway and check the output of arp -a also. See if your DNS servers are responding nslookup google.com and post it here. Look for error messages in the Event Viewer. –  gtirloni Sep 6 at 22:18

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