curl: (6) Could not resolve host: google.com; Name or service not known

Solution 1:

Issues were:

Here is how I fixed it:

IPV6 Disabling

Add Google DNS server

Open Terminal
Type su and enter to log in as the super user
Enter the root password
Type cat /etc/resolv.conf to check what DNS server your Fedora using. Mostly this will be your Modem IP address.
Now we have to Find a powerful DNS server. Luckily there is a open DNS server maintain by Google.
Go to this page and find out what are the "Google Public DNS IP addresses"
Today those are 8.8.8.8 and 8.8.4.4. But in future those may change.
Type vi /etc/resolv.conf to edit the resolv.conf file
Press Esc + i for insert data to file
Comment all the things in the file by inserting # at the begin of the each line. Do not delete anything because can be useful in future.
Type below two lines in the file

nameserver 8.8.8.8
nameserver 8.8.4.4

-Type Esc + : and then wq for save and exit
Now you are done and everything works fine (Not necessary to restart).
But every time when you restart the computer your /etc/resolv.conf will be replaced by default. So I'll let you find a way to avoid that.

Here is my blog post about this: http://codeketchup.blogspot.sg/2014/07/how-to-fix-curl-6-could-not-resolve.html

Perhaps you have some very weird and restrictive SELinux rules in place?

If not, try strace -o /tmp/wtf -fF curl -v google.com and try to spot from /tmp/wtf output file what's going on.