it just happened that one day when I am about to log into facebook page it says that facebook.com’s server DNS address could not be found. So i checked the computer setting if they blocked this page but it is not, what could be the problem of this.
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Check your current DNS settings. From a command prompt with 'ipconfig /all' . What are your dns servers?
Once you have dns IPs, use nslookup to check.
<you should get an answer here with IPs, if you don't, your DNS servers are wrong>
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