Unidentified network" with Server 2012 R2 and windows 8- Domain & NIC teaming

i have problem with my network ,before that i had just my domain but now some servers  specially win 2012 detect a network (name:network 4)
my 2012 windows server cannot be joined to doman also windows 8,but sometimes this problem solves without any troubleshooting and i can join again
what can be problem

Hi S.Sanadi,
According to your description, my understanding is that “Unidentified Network” causes problem with joining domain, and this problem will be resolved automatically.
If there is no default gateway or the default gateway is useless, the network will be identified as unknown. Check to see if the IP configuration is correct when the network identified unknown. Open command prompt and type:
Ipconfig /all
If the parameter is correct, try to ping IP address of default gateway and check to see if it works well.
Besides, if the connection should be identified as a Domain network and is not, then the likely causes are failure to contact DNS servers or domain controllers on that interface. Ping the IP address of DNS server and DC to make sure that these resources
are available.
Eve Wang

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