ping localhost gets timed out

From system preferences - under security; is 'stealth mode' enabled ?. If so try turning it off and run the localhost/loopback pings again.

I just tried that and got 10 pings in about 5 seconds. Have you tried restarting the router or re interning your network configurations. Depending on the time of day and volume on the network your trying to access you could get time outs, I get this using google search sometimes. If if happens all the time that is another matter. Your network provider might be a source of help with this. Is it only on that IP that it happens/

What about bringing the interface down and back up via the terminal: ifconfig en0/en1 down | ifconfig en0/en1 up. Alternatively does it work in another account ? or safe-mode: https://support.apple.com/kb/ph18760?locale=en_US

Can't say I've had loop-back fail before, definitely puzzling!.

Please read this whole message before doing anything.

This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.

The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem.

Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.

Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.

The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

Test while in safe mode. Same problem?

After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

my ginger wrote:

I just tried that and got 10 pings in about 5 seconds. Have you tried restarting the router or re interning your network configurations. Depending on the time of day and volume on the network your trying to access you could get time outs, I get this using google search sometimes. If if happens all the time that is another matter. Your network provider might be a source of help with this. Is it only on that IP that it happens/

He is trying to ping his computer from his computer. His issue has nothing to do with the network, his provider, or the time of day.