Due to security hardening, telnet is not available.
$ rpm -q --whatprovides nc nc-1.84-24.el6.x86_64 $ yum list nc Loaded plugins: refresh-packagekit, security epel/metalink | 11 kB 00:00 epel | 4.3 kB 00:00 epel/primary_db | 5.9 MB 00:03 public_ol6_UEKR3_latest | 1.2 kB 00:00 public_ol6_latest | 1.4 kB 00:00 Installed Packages nc.x86_64 1.84-24.el6 @public_ol6_latest $ nc -v -z -w 3 stackoverflow.com 80; echo $? Connection to stackoverflow.com 80 port [tcp/http] succeeded! 0
