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

  • EFI PXE grub2 Howto guide for Linux EFI PXE Booting on Debian, Mint, Ubuntu, RHEL
  • Aruba/HP/Dell IAP Wireless Controller Common Default Passwords
  • Debian, Mint Ubuntu how to remove package and associated config files
  • Linux Grub not booting the intended kernel solution in Debian, Mint, Ubuntu how to specify which kernel to boot by default
  • QEMU KVM Keyboard Problems Not Working Right Repeating Characters, Ctrl+C Copy and Paste not working right when using PS2 mouse in guests Solution
  • Linux how to compile binary with static sharedobjects embedded instead of dynamic to use on multi-distributions and avoid glibc compatiblity issues
  • /bin/sh: msgfmt: not found error solution on Linux Compilation Ubuntu Debian Mint Centos
  • Mikrotik RouterOS CHR/ISO Basic and Quick Setup Howto Guide
  • qemu 4 compilation options
  • CentOS 7 8 PXEBoot Netinstall Not Working Solution "Pane is dead "new value non-exisetnt xfs filesystem is not valid as a default fs type"
  • CentOS 6 EOL yum repo won't work Error: Cannot find a valid baseurl for repo: base Solution
  • CentOS 7 8 How To Disable SELinux
  • Wordpress How To Add Featured Image To Post in Hueman Theme
  • kdenlive full reset how to erase all config files
  • CentOS 7 8 yum error Trying other mirror. To address this issue please refer to the below wiki article
  • Microsoft Teams Linux - Calendar Doesn't Work Missed Meetings!
  • Scanner not working in Linux Ubuntu Fedora Mint Debian over the network? Use sane-airscan!
  • How To Boot, Install and Run Windows 2000 on QEMU-KVM
  • bash cannot execute permission denied
  • Huion and Wacom Tablets How To Install in Linux Mint / Ubuntu and make the stylus work properly