jdbc:posgresql problem

Hi,
when I'm trying to access database from the remote host using  jdbc I'll

get following error message:

----------------------------------
PostgreSQL basic test v6.3 rev 1

Connecting to Database URL = jdbc:postgresql://polaris:5432/coda_lg_db
Exception caught.
Something unusual has occured to cause the driver to fail. Please report

this exception: Exception: java.sql.SQLException: No pg_hba.conf entry
for host 129.57.33.170, user coda, database coda_lg_db
Stack Trace:

java.sql.SQLException: No pg_hba.conf entry for host 129.57.33.170, user

coda, database coda_lg_db
        at org.postgresql.Connection.openConnection(Unknown Source)
        at org.postgresql.Driver.connect(Unknown Source)
        at java.sql.DriverManager.getConnection(DriverManager.java:517)
        at java.sql.DriverManager.getConnection(DriverManager.java:177)
        at basic.<init>(basic.java:37)
        at basic.main(basic.java:197)
End of Stack Trace

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Please help me to solve this problem.
Thanking you in advance ,
vardan