Oracle access tables in SQLServer through Transparent Gateway

Question

HI,
I want to access tables in SQLServer2000 through Oracle Transparent Gateway, but i could not get the resqult when I excute sql " select * from mytable@tg4msql".
everthing seems all right and when i use " *tnsping tg4msql* ", it also return OK:
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
+(HOST = 192.168.255.10)(PORT = 1521))) (CONNECT_DATA = (SID=tg4msql)) (HS= OK))+
OK (20 毫秒)
but when i excute sql like " select * from mytable@tg4msql ", it does't return anything, just keeps quering till I kill my plsql.
it seems oracle tries to connect to SQLServer through database link but fail.
And i check Transparent Gateway debug log : ORACLE_HOME\tg4msql\trace\tg4msql_agt_964.trc,
the log stops when it gets the logon name.
thanks for answers~
this is Transparent Gateway debug log:
Heterogeneous Agent Release
+10.2.0.1.0+
+(0) hoagprd (2): ; hoagprd Entered.+
+(0) HOACONN.C (244): ; [Transparent gateway for MSSQL] version: 4.6.1.0.0070+
+(0) HOACONN.C (295): ; Class version: 200+
+(0) hoagprd (2): ; hoagprd Exited with retcode = 0.+
+(0) hoainit (3): ; hoainit Entered.+
+(0) (0): ; connect string is: defTdpName=tg4msql;SYNTAX=(ORACLE8_HOA,+
+(0) BASED_ON=ORACLE8, IDENTIFIER_QUOTE_CHAR="",+
+(0) CASE_SENSITIVE=CASE_SENSITIVE_QUOTE);BINDING=<navobj><binding><datasources><da-+
+(0) tasource name='tg4msql' type='MSSQLODBC'+
+(0) connect='HSWINRUN2.tg4msql'><driverProperties/></datasource></datasour-+
+(0) ces><remoteMachines/><environment><optimizer noFlattener='true'/><misc+
+(0) year2000Policy='-1' consumerApi='1' sessionBehavior='4'/><queryProcessor+
+(0) parserDepth='2000' tokenSize='1000' noInsertParameterization='true'+
+(0) noThreadedReadAhead='true'/><debug+
+(0) generalTrace='true'/></environment></binding></navobj>+
+(0) ORACLE SQL SERVER GATEWAY Log File Started at 2010-10-20T19:55:42+
+(0) hoainit (3): ; hoainit Exited with retcode = 0.+
+(0) hoalgon (7): ; hoalgon Entered. name = myuser.+

Answer 1

I checked the active sessions, and found a session was creating databse link, but it didn't stop until i kill it.
STATUS EVENT STATE
ACTIVE HS message to agent WAITING
I have installed the transparent gateway and SQLServer in the same computer.
maybe something wrong happened when transparent gateway connect to the SQLServer. But i don't know how to check it.