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i have 2 computers connected to the router trough ethernet and one works and the other one has invalid ip address i tried everything and it still dont work even replaced cards in the computer it also says limited or no connectivity
You are most likely having a DNS / DHCP / or IP problem here.
As posted above you should first check your IP address in Command Prompt (CMD).
If its a 169.xxx.xxx.xxx that means that Windows is assigning you an IP address because it cant get one from your ISP / ROUTER.
If its a 192.xxx.xxx.xxx that means that you are getting a valid IP from your Router / Switch / Hub.
If its anything else you may want to try and renew it by typing: IPCONFIG /RENEW
You may get an error with trying to renew it, but these steps will definatley help you determine if its a communication problem or a blocking issue such as security.
"Could be a whole bunch of other things, but its a good idea to start with some low level testing like this first."
NOTE: If you are getting a valid IP address then you may want to try a PING test to see if communication is working...
Post back for further assistance.