ORA-12154: TNS:could not resolve the connect identifier specified

[gurusamy sengodan]

Hi,
On tuesday it was working.
Now i am trying to connect the database using toad.
I got this error.
ORA-12154: TNS:could not resolve the connect identifier specified .
The oracle 10g client is re-installed on my machine on tuesday.
it is because of that


please help me how to resolve this problem

[sachin K Kansal]

first check the tnsnames.ora file on your system. Might you have overwritten that one in which SID and other info for the server were there.

You can copy the tnsnames.ora file from another similar client system and replace it with new one.

Also check if oracle server is on and you are able to ping it.