SSH Slow Login even with SSHD UseDNS no parameter

I couldn't understand why on one system it took a few minutes to get the SSH login prompt when connecting to other systems. The other systems all had the UseDNS parameter set to no, which almost always resolves the login prompt delay.

The reason is Ubuntu and perhaps Debian and other distributions /etc/nsswitch.conf file

Edit yours to have the "hosts" line like so (notice that files and dns are the primary resolution choice)

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


If the above does not work - disable GSSAPI auth

This permanently caused my slow SSH login problems:

Edit vi /etc/ssh/ssh_config

Disable GSSAPI auth by setting the following line (make sure to uncomment or change the existing line if there is one that says yes):

GSSAPIAuthentication no

I realized what has happening by running -v with SSH, it kept timing out and trying to use GSSAPIAuthentication before trying password, unlike some older systems I have.

I'm sure this is a real annoyance for a lot of people too.


Tags:

ssh, login, sshd, usedns, parameteri, couldn, prompt, connecting, parameter, resolves, ubuntu, debian, distributions, etc, nsswitch, conf, edit, quot, hosts, dns, primary, resolution, mdns, _minimal, notfound, disable, gssapi, auth, permanently, vi, ssh_config, uncomment, existing, gssapiauthentication, password, annoyance,

Latest Articles

  • Huion and Wacom Tablets How To Install in Linux Mint / Ubuntu and make the stylus work properly
  • ffmpeg how to cut certain parts of video out
  • ffmpeg how to concat and join two video clips
  • mencoder instead of ffmpeg to join or concatenate video files with different audio streams
  • Linux How To Stop Missing Drive from Halting Boot Process in fstab
  • How To Replace Audio Track of Video using ffmpeg
  • qemu-img convert formats vdi vmdk raw qcow2
  • Linux and Windows Dual Boot Crazy Time Issues
  • dynagen / dynamips 100% high CPU usage solution - how to set the idlepc value
  • How To Setup a Cisco CME (Cisco Manager Express) Virtual Router under Linux using dynamips and dynagen
  • Linux Mint Ubuntu Debian CentOS Dual Boot Install Issues
  • Linux Mint Ubuntu Debian Centos RHEL no sound solution
  • Linux Mint/Debian/Ubuntu/Centos Installer black grub screen and blank screen after trying to boot installer or main OS
  • Linux Mint Dual Boot Install Avoid Wiping our your Main C: drive /dev/sda MBR and EFI
  • QEMU-KVM soundhw deprecated how to enable sound in QEMU 4.x series
  • Virtualbox Error Cannot register the hard disk because a hard disk with UUID already exists solution
  • kernel: [549267.368859] mate-terminal[7871]: segfault at 2000000101 ip 00007f5d0a9548f0 sp 00007fff7012c610 error 4 in libgobject-2.0.so.0.4800.2[7f5d0a920000+52000]
  • apcupsd how to setup and monitor APC UPS units
  • How To Password Reset, Recover, Bypass, Remove and Unlock on Windows 10,8,7,Vista,XP,NT,2000,2003,2008,2012,2016,2019 Administrative Login Programs
  • Nvidia Ubuntu Linux Screentearing Video with solution driver