It may happen that you can't ping a hostname either internally on a local DNS you may be running or externally.   Flushing the DNS cache may not work either:

C:\Users\tom>ipconfig /flushdns

Windows IP Configuration

Successfully flushed the DNS Resolver Cache.

C:\Users\tom>ping vcsa01
Ping request could not find host vcsa01. Please check the name and try again.

C:\Users\tom>ping vcsa01

So what you can also do is disable IPv6 in windows for the Interface you're using under Control Panel -> Network and Sharing Center.

If that doesn't work, consider if you are using OpenVPN.  If the OpenVPN client is up and you're using VPN to move in and out of your infrastructure, consider turning it off or restarting DHCP Client in windows Services.  

Alternately, you may have a third DNS server in the IPv4 Advanced Properties panel of your network card properties in Windows.  Review your DNS and remove any extra DNS entries that can't resolve the hostnames you are trying to get too.

Cheers,
TK