How to disable SSH reverse mapping checking

If you want to disable reverse mapping checking getaddrinfo while connecting to a remote server via SSH then there two options :

 

local : /etc/hosts

 

If you want to resolve this locally then all you need to do is to add an entry for the remote host in the /etc/hosts file as :

 
root@server[#] vi /etc/hosts 

Add the below line 

10.10.10.10 server.remotehost.com  save and quit.

 

remote : /etc/ssh/sshd_config

 

open the /etc/ssh/sshd_config file and then locate the entry

 

GSSAPI options

 

# GSSAPI options
#GSSAPIAuthentication no
GSSAPIAuthentication yes
#GSSAPICleanupCredentials yes
GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no

In the above entries you need to commend the line

 

GSSAPIAuthentication yes

to disable the reverse mapping authentication for SSH

 

#GSSAPIAuthentication yes

and then restart the sshd service

 

That’s all you are done.