Hi all, I have installed Oracle 10g database and also a client for 10g, both on the same machine. Then I installed Toad for Oracle(version 10.5) . I am using Windows-7. When I start toad with the below mentioned details, I get the message " ORA-12154: TNS:could not resolve connect identifier specified(XE)" The details which i used are as below: User/Schema : system Password : ******** Database : XE Connect as : Normal Connect using(drop down) : XE The other options in "connect using" dropdown was XE, OraClient10g_home1, OraHome92, OraHome92(Oracle Root) and Oracle. Of these listing only XE and OraClient10g_home1 are in normal colours. But OraHome92, OraHome92(Oracle Root) and Oracle are displayed in red. My tnsnames.ora file has the following contents : XE = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = Mohammed)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = XE) ) ) EXTPROC_CONNECTION_DATA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE)) ) (CONNECT_DATA = (SID = PLSExtProc) (PRESENTATION = RO) ) ) ORACLR_CONNECTION_DATA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE)) ) (CONNECT_DATA = (SID = CLRExtProc) (PRESENTATION = RO) ) ) Can you people please help me in resolving this issue ........................? Thanks in advance, Mohammed P.