Unable to get iMac to connect to internet. Internet works fine

Internet works very well and many things are connected and connections very well. However my office main iMac 27 "(tout à jour) does not connect." On the iMac, the System Prefs network show everything is fine and it is connected by Ethernet and Wifi. The router indicates that all is well. The firewall is very good. But no program seems to connect. It was fine last night.

Other computers and iPhone are connected and works OK.

The internet has been disconnected late at night, but when it was returned to service everything seems to work except 1 computer.

Does anyone have any ideas how I can get going again?

Thank you

Connect using ethernet or wifi, not both.  If you haven't already done so, restart the router and the computer.  Yes, you may have to restart the router even if other devices are working properly.  If you use DHCP (auto configured IP address) the router might still have an old IP address assigned to the MAC address of your network card.  The MAC address is the router knows what IP address to route the data to.  Also verify that you have an IP address valid in system-> network preferences.  If the IP address of the router is then the IP of your computer should be 192.168.0.xxx.  If you have a valid IP address, open the terminal and type "ping router_ip_address".

# ping

If you don't have a valid IP address after you restart the router and the computer, remove the network interface in system-> network preferences and then add it again.

Tags: Mac

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