Problem connecting MS SQLServer & Postgresql using psqlODBC driver

Hello,

I'm unable to connect from DTS designer (MS SQLServer2000/WindowsXP
Professional) to PostgreSQL (RHEL-4) using psqlODBC driver. I setup a DSN
successfully in the Windows machine. (but did not change any of the default
values of advanced options)

While creating a connection in DTS designer, the installed psqlODBC driver
is listed, and it pops up a window, where I typed in the ip address of the
linux box and the postgres username and password.

Would you please help me out? The details are as follows:

1) ODBC driver version - psqlodbc-08_01_0200 (downloaded from
http://www.postgresql.org/ftp/odbc/versions/msi/)

2) PostgreSQL database version - 7.4.6-1 (this is the rpm name - running on
RHEL-4)

3) Error message -

"Package error :
HResult of 0x80004005 (-2147467259) returned
Unexpected error occured. An error result was returned without an error
message."

4-a) Error log file (mylog_1532.log) -

" [3428]globals.extra_systable_prefixes = 'dd_;'
[3428]aszKey='DSN', value='PostgreSQL'
[3428]copyAttributes:
DSN='PostgreSQL',server='',dbase='',user='',passwd='xxxxx',port='',onlyread='',protocol='',conn_settings='',disallow_premature=-1)

[3428]globals.extra_systable_prefixes = 'dd_;' "

4-b) Error log file (psqlodbc_1544.log) -
The following error appears many times in the log file:

" func=PGAPI_DriverConnect, desc='Error from CC_Connect', errnum=101,
errmsg='Could not connect to the server' "

I guess, each one corresponds to each of my (unsuccessful) connection
attempts?

Thanks in advance.
Ram Mohan