You cannot turn on Network Discovery in Network and Sharing Center

To resolve the issue, follow these steps:

Make sure that the following dependency services are started:
DNS Client
Function Discovery Resource Publication
SSDP Discovery
UPnP Device Host

Configure the Windows firewall to allow Network Discovery. To do this, follow these steps:

Open Control Panel, click System and Security, and then click Windows Firewall.
In the left pane, click Allow an app or feature through Windows Firewall if you are running Windows Server 2012. Or, click Allow a program or feature through Windows Firewall if you are running Windows Server 2008 or Windows Server 2008 R2.
Click Change settings. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Select Network discovery, and then click OK.

Configure other firewalls in the network to allow Network Discovery.
Turn on Network Discovery in Network and Sharing Center.

Web Proxy Auto Discovery security fix

By default, WPAD resolution for auto proxy detection will not use NETBIOS. Therefore, if proxy detection depends on NETBIOS alone for WPAD resolution, it may fail. We recommend that you use the DHCP option or DNS for WPAD resolution instead of NETBIOS. To change this new default behavior, create the following registry entry.

Note This registry entry only applies for Windows 8.1 and earlier versions of Windows.
SUBKEY: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp
Value Name: AllowOnlyDNSQueryForWPAD
Value: 0
Default value of the flag: 1

Но, Более правильным решением является отключение службы WPAD и блокировка на роутере 137,139,445 портов
Также NetBIOS стоит включать только на интерфейсах с локальным Windows файло-обменом

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