Visitor
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5 Messages
dns error
I have been experiencing intermittent lapses in internet on my macbook pro. WIFI diagnostics say "Mac is unable to resolve "www.apple.com" using the DNS settings provided by your internet service provider. Help?
Visitor
•
5 Messages
I have been experiencing intermittent lapses in internet on my macbook pro. WIFI diagnostics say "Mac is unable to resolve "www.apple.com" using the DNS settings provided by your internet service provider. Help?
CCChristopher
Problem Solver
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577 Messages
3 years ago
@user_f15b50 Hello and good afternoon, and thank you for reaching out here over our Xfinity Community Forum. I am so sorry to hear about these DNS error issues that you have been experiencing, that would definitely be really frustrating. You have reached the right place, and I would be more than happy to assist you in getting these internet service issues resolved once and for all! That is actually one of our specialties! To get started, what troubleshooting steps have you tried so far, if any? -Christopher
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flatlander3
Problem Solver
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1.5K Messages
3 years ago
There are a of reasons for a DNS time out. Could be, you just didn't get a response in time from a DNS server (transient network condition).
On a Mac, a quick one is a corrupt local dns cache. Fix it by opening up a terminal, then do:
# sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder (El Captain and newer).
Might have a browser hijack that is redirecting your searches, or sharing private info with a 3rd party and that doesn't happen fast enough and causes a timeout -- yes, that can happen on a Mac too. Try clearing browser cookies and web content pages. Does it happen if you try another browser? (firefox....anything.....) Anti-virus with a 'web shield' can also cause DNS timeouts if the communication with the anti-virus company stalls. VPN's can cause them too on a connection stall.
Could also be you just have issues with your cable service. Take a look here, and try some troubleshooting paying attention to signal power levels and errors in the logs:
https://forums.xfinity.com/conversations/your-home-network/internet-troubleshooting-tips/602dae4ac5375f08cde52ea0
I have also had intermittent issues with Xfinity's DNS servers in general. I don't use them. You also can't change them to somewhere else if you use Xfinity gear now. You can with 3rd party equipment.
Pretty tough to troubleshoot without more information. You are going to have to poke at it yourself a bit.
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