my system can not ping any other system on the network but other system on the network can ping one another. It was not like that before and no one qworked on it.
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If it's windows and it's a new computer, have you gone through the Network Setup wizard? It opens some firewall ports. If you just install the card and set up an address, but don't run the network setup, the firewall may still be closed.
make sure that nothing is blocking ICMP. Try to open a command window and type this netsh diag show test then hit enter. This will cycle through a diagnostic trying to reach your localhost, dc, dns sever, etc. if anything looks wrong there it will give you more information on where to start.
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my system can not ping any other system on the network