A problem seemed silly -- cannot connect to SDE service

Question

Hi,
i've just installed ArcSDE 9.2 for oracle 10g on my web server ,  OS on which is Windows Server 2003 . Install , post install , all passed as usual . Service started as well . all the problem is i cannot connect to it. i checked the database through PL/SQL Developer , the user and password is right , tables on the account has been created . i checked the service file on %SYSTEM%/WINDOWS/SYSTEM32/DRIVERS/ECT/ and my service has been wrote and did not conflict with other services . i tried to connect it through ArcCatalog on my machine , failed , said " Operation Failed". i wrote a little program (which is proved correct) and ran it on the server , said "Entry for SDE instance no found in the service file" ...
i don't know what to do now. can anybody give me a hand?
thank you.

YuDe · Answer

as the title said ...
i finally found that it's the ArcEngine license that cause the problem ...
i develop the little problem mentioned above in my machine , which with DEV license , and forget to register AE license in the server ... 
thanks vangelo very much ...
Ted.

YuDe · Answer

i searched the error code -102 in google , and little helpful information found....

'sdelayer -o describe -i port:# -u user -s localhost' and enter the password for that user , reports:you do not have access to any layer in this database

YuDe · Answer

hi , vangelo. thank you very much for replying.

there are two service i created , and the last one on the last line.

i connect it from the same host.

'sdemon -o status' reports :ArcSDE Instance dlsz_sde Status on svctag-558wd2x at Mon Apr 12 09:12:16 2010
------------------------------------------------------------------------------------------------
Server Connection Mode:Accepting Connections
Active Server Processes: 0

as you see , the other instance not reported here , and both cannot connect to.

'sdelayer -o describe' reports:Error: Entry for SDE instance not found in services file (-102).
Error: Cannot get configuration information

-Ted