Troubleshooting DNS Resolution Issues

Last Post

RSS

azmanagedit

(@azmanagedit)

Member Admin

Joined: 10 months ago

Posts: 88

Topic starter 01/10/2024 9:34 pm

DNS resolution problems can disrupt access to websites and services. Here’s how to troubleshoot advanced DNS issues on your network.

Check DNS Configuration: Ensure that your device is using the correct DNS servers. Use cat /etc/resolv.conf (Linux) or ipconfig /all (Windows) to check DNS settings.
Use Nslookup or Dig: Run nslookup (Windows) or dig (Linux) to test DNS queries. If the DNS resolution fails, try querying different DNS servers to see if the issue is with your server or the DNS provider.
Check Local Hosts File: Verify that no incorrect entries exist in the hosts file that could be overriding DNS. On Linux, this file is located at /etc/hosts, and on Windows at C:\Windows\System32\drivers\etc\hosts.
Flush DNS Cache: Clear the DNS cache to ensure you aren’t accessing outdated entries. On Windows, use ipconfig /flushdns, and on Linux, restart the DNS service (sudo systemctl restart systemd-resolved).
Test Alternative DNS Servers: Switch to public DNS servers like Google DNS (8.8.8.8) or Cloudflare DNS (1.1.1.1) to see if the issue is related to your ISP’s DNS servers.
Check Firewall or Router Settings: Sometimes firewalls or routers can block DNS queries. Ensure that port 53 (DNS) is not being blocked and that your router is properly configured to forward DNS requests.

Quote

Forum Statistics

44 Forums

95 Topics

88 Posts

0 Online

2 Members

Forum Icons: Forum contains no unread posts Forum contains unread posts

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

AZ Managed IT
Forums