ping 127.0.0.1 Request timeout

[HDFan]

On my Studio 14.6.1 I had a problem with my Plex server http://127.0.0.1 not being found. When I pinged the local host it timed out:

Mac-Studio-M2-6566 ~ % ping localhost
PING localhost (127.0.0.1): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
--- localhost ping statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss


Mac-Studio-M2-6566 ~ % ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1

No problems with internet connectivity with remote sites.

I rebooted the system and the Plex URL 127.0.0.1 now works in Safari but the pings still fail.

Mac-Studio-M2-6566 ~ % ifconfig

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
nd6 options=201<PERFORMNUD,DAD>

so seems normal. Summary:

1. I have internet connectivity.
2. can't ping local host
3. but Safari will find the local host

Any ideas on what is happening?

 

[Grumpus]

Any ideas on what is happening?

Do you have Enable stealth mode turned on in your firewall settings?

 

[svenmany]

I put this thread on watch because I'm curious. Just to throw out a long shot:

Any chance you're running the packet firewall? I guess some software could have started that up on your behalf and set a rule to prevent ICMP.

Can you ping your machine at your external ip address - the network card's address?

 

[9valkyrie]

In some server configs ping can be turned off, so you cannot ping the server. Maybe this is the same thing?

 

[HDFan]

Do you have Enable stealth mode turned on in your firewall settings?

That was it! Don't know why this suddenly became an issue. Wonder if the setting got changed in the latest update to 14.6.1?