Internet Connection Troubleshooting

Open cmd
A) ipconfig /release                            // Release current dhcp assigned ip
B) ipconfig /renew                             // Assign new ip
C) ipconfig /flushdns                         // Clear dns cache
D) netsh int ip reset                           // Reset tcp/ip stack
netsh winsock reset <catalog>
E) netsh int ip set address "Local Area Connection" dhcp         // set to obtain ip from dhcp
F) run windows network diagnostic by right clicking on adapter
G) rollback network adapter driver from devmgmt.msc
H) disable tcp setting in command prompt
netsh int tcp set heuristics disabled
netsh int tcp set global autotuninglevel=disabled
netsh int tcp set global rss=enabled
I) to confirm tcp setting successfully disabled
netsh int tcp show global
J) turn off firewall
netsh advfirewall set allprofiles state off
to turn on firewall all profile
netsh advfirewall set allprofiles state on