Unable to connect to 10g database from developer suite 10g

I have loaded oracle 10g on my server with OS windows 2003 and it is working fine.Now I have installed Oracle developer suite 10g on windows XP client . we have configured local listener also and its entry is found in tnsnames.ora
My database name is mbxdata .
I have defined my host name as
MBXDATA.mbxnet.com in tnsnames but I am unable to connect to the database since I get error as ORA-12154 : TNS :could not resolve the connect identifier specified.
Please suggest matter urgent.
Thanks in advance

We are having the same issue now. Was this ever resolved? We created 2 new databases and added those entries in both tnsnames on the local pc, and the tnsnames on the application server. Able to connect via sqlplus, toad, etc. but not through forms developer. We are running 10g app server, 10g developer suite, 10g databases. Any ideas?
Thanks,
Deb

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