Ubuntu Linux Slow/Delayed SSH ping response Solution

I've only ever seen this in Ubuntu for some reason and it is because of the /etc/nsswitch.conf settings.

So the issue is that if the hostname's reverse DNS cannot be found that you need to go back to DNS which was not the default in this nsswitch.conf file for some strange reason.

Edit /etc/nsswitch.conf and replace your "hosts" line with this:

#hosts:          files dns mdns4_minimal [NOTFOUND=return] mdns4
hosts: files mdns4_minimal [NOTFOUND=return] dns [NOTFOUND=return] mdns4

I kept the original hosts line commented out in case I need to return to the original although I doubt it.

After editing like above then ping responds right away without a several second delay.


Tags:

ubuntu, linux, delayed, ssh, ping, solutioni, ve, etc, nsswitch, conf, settings, hostname, dns, default, edit, quot, hosts, mdns, _minimal, notfound, commented, editing, responds,

Latest Articles

  • Linux Mint Mate Customize the Lock screen messages and hide username and real name
  • Ubuntu/Gnome/Mint/Centos How To Take a partial screenshot
  • ssh how to verify your host key / avoid MIM attacks
  • Cisco IP Phone CP-8845 8800/8900 Series How To Reset To Factory Settings Instructions
  • ls how to list ONLY directories
  • How to encrypt your SSH private key file id_rsa
  • Linux Mint 18 Disable User Name List from showing on Login Screen
  • Firefox Cannot Hit Enter Key In Address Bar and Location History Not Working
  • Cisco Unified Communications Manager / CUCM IP 8.6,10,12 Install Error Solution
  • Ubuntu Debian Mint Linux SSHD OpenSSH Server Not Starting After Reboot Solution
  • nmap how to scan for all ports and not just the 1000 most common ports
  • Windows 7,8,10 and Server 2008, 2012, 2016, 2019 Read Only Attribute Won't Go Away
  • bind / named how to make a wildcard record and retain defined A records
  • Cisco Unified Communications Manager 12 Install Errors on Proxmox/KVM
  • Local Vs Universally Administered MAC Address NIC Refuses to come up
  • Cisco Unified Communications Manager 12 CUCM 12 - How To Enable Video Calling
  • Windows 7, 8, 10, Windows Server 2008, 2012, 2016, 2019 How To AC97 Audio Drivers and Other Unsigned Drivers
  • Cisco Unified Communications Manager / CUCM IP Telephony Definitions
  • tftp Linux xinetd verbose logging
  • Linux delete unused tap devices automatically