Finally found a small problem with Windows 7, 8, 8.1 and 10. After upgrading, we have discovered that Windows was responding slow to our SQL Server 2008. What we discovered is below.
Slow response times in Windows to a SQL Server can be due to the LLMNR protocol. This may be resolved by turning off the LLMNR protocol.
LLMNR is a protocol that allows both IPv6/4 computers to perform name resolution for the NetBIOS names of other computers without requiring a DNS server.
IPv4 hosts can use NetBIOS over TCP/IP (NetBT) to resolve computer names to IPv4 addresses for neighboring computers by broadcasting a NetBIOS Query.
All IPv4-based LLMNR hosts listen on the IPv4 multicast address 188.8.131.52 instruct their Ethernet network adapters to listen for Ethernet frames with a destination multicast address.
Windows -based LLMNR computers do not send or respond to unicast queries.
To disable LLMNR:
Modify Group Policy…
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