SSH Login Takes a Long Time

Has it ever happened to you that logging in to an SSH server takes a long time? More than, say 20, 30 seconds? Well, there are many solutions out there to fix it, some may even make your system less secure. So let’s go to the source of SSH, so to speak, for a resolution. If you head over to ssh(1) takes a long time to connect or log in, you will see that it’s an issue with DNS resolution. To resolve this issue, try the following steps:

You need to change the sshd config file …

sudo vim /etc/ssh/sshd_config

… and make sure you have this line uncommented

UseDNS no

Save the file and restart SSH daemon (service) like so

sudo service sshd restart (Fedora, Red Hat, CentOS)

or

sudo /etc/init.d/sshd restart (Debian, Ubuntu)

Hat tip: Slow SSH login;

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Possibly related posts: (automatically generated)

• SSH in ESXi
• Changing the port number at ssh
• Securing SSH
• Restrict ssh-server access to specific network