No DNS server setting in resolv.conf with Fedora 15

After a clean install of Fedora 15 and an upgrade to apply all current fixes, you may find that your network connection successfully receives a DHCP reply, complete with DNS server, but you are unable to resolve domain names.

Conditions and symptoms are:

• You are using Network Manager (e.g. under Gnome 3)
• Your network connection shows as “connected” in Gnome “System Settings”, “Network” and displays an IP address, Default Route and one, or more DNS servers.
• You can successfully ping external addresses in a terminal session:
  e.g. ping –c 3 8.8.8.8
• DNS lookups fail:
  e.g. nslookup www.google.com.
• You may see an SELinux AVC denial alert under Gnome.
• The file /etc/resolv.conf.tmp exists and contains a valid DNS server IP within.
• /var/log/messages contains the following:
• <warn> could not commit DNS changes … Permission denied
• setroubleshoot: SELinux is preventing NetworkManager from unlink access on the file /etc/resolv.conf

To fix this:

Open a Terminal window session and type:

su –
<enter your password>
restorecon /etc/resolv.conf

Now disable and re-enable your network connection from the Gnome network tray icon and re-test DNS lookups by either opening up a browser and navigating to any page, or by using nslookup in a terminal window.

Advertisement