Mac
What is DNS problem in internet?
A DNS failure occurs when users are unable to connect to an IP address via a domain name. A message will pop up that may say “DNS server not available” or “Server DNS Address could not be found.” Essentially, it’s like dialing a phone number and getting back a busy signal.
What causes a DNS issue?
Why does a DNS error occur? DNS errors occur essentially because you’re unable to connect to an IP address, signaling that you may have lost network or internet access.
How do I check DNS problems?
Run ipconfig /all at a command prompt, and verify the IP address, subnet mask, and default gateway. Check whether the DNS server is authoritative for the name that is being looked up. If so, see Checking for problems with authoritative data.