Subject unable to complete network request localhost


I used this to get by the error: su: failed to execute /bin/nologin: No such file or directory
I changed to sbin instead of bin in /etc/passwd

I also log in like this for firebird user:

# su - firebird -s /bin/bash

Now I am getting under the firebird user:

I was told to try localhost like this by google:

$ isql-fb
SQL> connect "localhost: /var/lib/ firebird/ 2.5/data/ employee. fdb " user
'SYSDBA' password 'SYSDBApassword';

Unable to complete network request to host "localhost".
-Failed to establish a connection.

Any tips?

THANKS- 3rdshiftcoder