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Hi THere
THis doesn't sound like a DNS issue but more like an internet connectivity issue. Do you have an Internet Gateway or NAT Gateway attached to your VPC? Can you test connectivity from the EC2 instance with a basic test? Try to run the command
ping 8.8.8.8
and you should get a reply similar to:
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=115 time=1.90 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=115 time=1.54 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=115 time=1.47 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=115 time=1.44 ms
^C^C
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 1.444/1.589/1.903/0.184 ms
See https://repost.aws/knowledge-center/ec2-connect-internet-gateway