Sql developer is able to connect, but NO toad or sqlplus or tns ping

Hi folks,
Come across an interesting situation, able to connect using sql developer, but no tns ping or toad or even sql plus too, what do you think, what is the problem and how to fix too.
Guidance/assistance will highly be appreciated.
Thanks.

user8604530 wrote:
Sorry folks, for not providing complete info ... apologize for this inconvenience, here is error + version too:
SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 11 16:30:05 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
Enter user-name:
Error for tnsping too, where as, able to ping the server, but not to db.
As told earlier too, able to work via sql developer.we still do not know what exactly you did that throws the error!
ORA-12154 ALWAYS only occurs on SQL Client & no SQL*Net packets ever leave client system
ORA-12154 occurs when client requests a connection to some DB server system using some connection string.
The lookup operation fails because the name provided can NOT be resolved to any remote DB.
The analogous operation would be when you wanted to call somebody, but could not find their name in any phonebook.
The most frequent cause for the ORA-12154 error is when the connection alias can not be found in tnsnames.ora.
The lookup operation of the alias can be impacted by the contents of the sqlnet.ora file; specifically DOMAIN entry.
TROUBLESHOOTING GUIDE: ORA-12154 & TNS-12154 TNS:could not resolve service name [ID 114085.1]
http://edstevensdba.wordpress.com/2011/02/26/ora-12154tns-03505/

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