Connection refused(public key,password authentication,keyboard interactive)

This error comes when you are trying to login to a machine using ssh or telnet

This may be due to

1)the password you provide may be wrong

2)next chance may be the user account you are using to login to a remote machine can be locked.

for example:ssh karthik@123.45.66.77

this may throw this error
 In this case the karthik account in 123.45.66.77 can be locked.


This can be found out by checking /etc/shadow file in 123.45.66.77 .The karthik account in /etc/shadow file
can be mentioned with *LK* showing it is locked.