I did come across some discussion about that. I'm also checking on the loopback device (lo).
Per Mark Wagner's comment, the output of sysctl _echo_ignore_all is: _echo_ignore_all = 0
Unable to ping loopback address update#
I'm out of ideas of what to try next? Are there any other suggestions or ideas? update I checked auth.log and sysconf log and couldn't find anything helpful there. Ifconfig correctly lists all of my IP address. I checked to make sure ECHO responses are on for ping and I did not find any configuration settings turning it off (and I can ping the server remotely).
I also checked IPtables and I didn't see any rules there and I did follow some instructions to "turn off" IPTables (set rules to allow) and that had no affect. I couldn't find any of my server's IP address. I did play around with denyhosts last week and I did try turning denyhosts off as well as verify 127.0.0.1 is in hosts.allow and the server IP addresses are not in ny and checked all denyhost files in /var/lib/denyhosts. Wget hangs and I believe it's related to the fact that the server is not allowing connecting to itself. I found out as I had a cron job that went out to a web page on a server with "wget" to download a report. This use to be working up to a week ago and I'm not sure what changed. but the server can't access that IP address Pinging a domain name on the server does translate the domain to the correct IP.The server can't ping itself (127.0.0.1 or any static IP address on.The server can ping all outside address (, ,.I've been Google-ing and banging my head against the wall for a couple of hours on this one. No network loopback device after security update ubuntu 12.04 Original Question This SF Answer helped me after nerve's answer below:
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