Ubuntu – SSH , Howto Fix Delay Password Prompt + SSH Server installation cmd

When I freshly installed UBUNTU , and tried to login to Ubuntu via ssh , it takes up-to 10-20 seconds for password prompt.

The quick fix was . . .

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Solution # 1

The quick fix was to inform ssh to stop using DNS during the connection.

Issue the following command in terminal and restart SSH.

sudo echo "UseDNS no" >> /etc/ssh/sshd_config

Restart SSH Service

service ssh restart

Now login to server via ssh an this time it will work instantly

Regar’d
Syed Jahanzaib

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OR the MANUAL way to add UseDNS in sshd_config file

You can do it manually on the config file.

Add the following to your sshd_config file and restart SSH.

Edit the /etc/ssh/sshd_config file using the following command

nano  /etc/ssh/sshd_config

& Add the following line at top.

UseDNS no

Save the File and Exit , restart ssh service and Re-Try Login. It ill work fast now without delays.

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Solution # 2

Edit the /etc/ssh/ssh_config file using the following command

nano  /etc/ssh/ssh_config

Commen the following lines by adddin # at start of the line

GSSAPIAuthentication yes
GSSAPIDelegateCredentials no

TO

# GSSAPIAuthentication yes
# GSSAPIDelegateCredentials no

save the file and exit and restart SSH service by

service ssh restart

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Howto install SSH Server in Ubuntu

if you have forgot to install SSH server during Ubuntu server installation, then you can install it , just make sure you have internet access on the box.

With Root access use following

sudo apt-get install openssh-server