Remote PostgreSQL connection.
   When I tried to connect to PostgreSQL DB from a remote system in another network , where a firewall is also installed, using JDBC driver
   I am getting an error 'NoRouteToHostException'.
    Client for PostgreSQL(System-A):is also a webserver with apache,tomcat and postgresql installed on it. The Firewall (IPChains) is also installed on this system.
    My web application has to connect to a remote PostgreSQL in another network
   postgresql version on this system : 7.0.3
    Remote DB(System-B): is also a webserver where apache , tomcat , postgresql are installed . CLient has to get data from this DB.
   postgresql version on this system: 7.0.3  
   What I did :
   1.In firewall  entry on Sys-A, i have given permission for the Postgres port(5432) for Sys-B IP address ,both input and also output permissions.
   2.In pg_hba.conf on Sys-B , I have added the host entry for client IP address (Sys-A) and also the server IPaddress(Sys-B)
  I am using postgres JDBC driver in my web application to access DB. url " jdbc:postgresql://Sys-B IP/dbName"
  when i invoke my application I am getting the error as NoRouteToHostException.
  When I ran the same application from another system(Sys-C) which is in the same network as Sys-B (no firewall ), I am able to access DB, Without any entry in
  pg_hba.conf file on remote PostgreSQL (Sys-B) .

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