comprehensive tcpip reset:
ttcshelbyville.wordpress.com/2011/10/20/reset-tcpip-network-troubleshooting/
Quote:
Click Start Menu, type cmd in the search box or run box ( Hold down Ctrl + Shift and hit Enter)Type the following commands, each followed by pressing enter.
ipconfig /flushdns
nbtstat -R
nbtstat -RR
netsh int reset all
netsh int ipv4 reset
netsh winsock reset catalog
This will rebuild the tcp/ip protocol stack (fully)
After rebooting, run a command prompt as an administrator and type:
netsh interface tcp set global autotuninglevel=disabled
Reboot
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