Pidgin error : No authentication method

When I am try to connect my Pidgin, I got the following error message.

 Server does not use any supported authentication method

When I look into hosts file, it was:
 ajeesh@tech12:~$ cat /etc/hosts
127.0.0.1       localhost
127.0.0.1       tech12.ajeesh.net

hostname,  file it was
ajeesh@tech12:~$ hostname
tech12
So I have changed the host file as follows and this fixed my Issue.
root@tech12:# cat /etc/hostname
tech12.ajeesh.net