resolve - DNS lookup failing -


i have primary , secondary domain controller use our dns servers. users getting mixed results accessing websites. work fine, others giving error:

network access message: website cannot found explanation: ip address website requested not found.  result, not possible access site.

for example, mcmaster.com not work. if run nslookup primary dc:

c:\users\administrator>nslookup mcmaster.com server:  dc.mydomain.local address:  10.1.1.35  non-authoritative answer: name:    mcmaster.com address:  209.64.25.230

all looks well, when run nslookup www. prepended address:

c:\users\administrator>nslookup www.mcmaster.com server:  dc.mydomain.local address:  10.1.1.35  dns request timed out.     timeout 2 seconds. dns request timed out.     timeout 2 seconds. *** request dc.mydomain.local timed-out

running nslookup www.mcmaster.com dc gives different error:

*** backupdc.mydomain.local can't find www.mcmaster.com: server failed

i think mcmaster.com resolves www.mcmaster.com, results in user not being able access site. ideas how can troubleshoot this?

i ran nslookup system @ work , got following response:

server:  whatever address:  xxx.xxx.xxx.xxx  non-authoritative answer: name:    mcmaster.com address:  209.64.25.230   server:  whatever address:  xxx.xxx.xxx.xxx  non-authoritative answer: name:    a1843.b.akamai.net addresses:  23.66.232.17           23.66.232.26 aliases:  www.mcmaster.com           www.mcmaster.com.edgesuite.net

my initial thought whoever owns dns mcmaster didn't have www valid response. know forward requests www.whateverdomainirun.com whateverdomainirun.com, but, seeing different dns 2 surprised me.

when navigate http://mcmaster.com forwarded www. when run tracert on mcmaster.com fails destination net unreachable. looks me company has put site in akamai's hands , either that's recent local dns servers haven't updated , try flushing cache , doing again, or, in way you're blocking requests akamai reason on firewall.

best , quick guess , may wildly wrong :).


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