postgresql - Lazarus + Postgres: incomplete startup packet -

i've been building lazarus pascal program using postgresql on back-end. used work fine following lines opening db.

  dbconn:= tpqconnection.create(nil);   dbconn.hostname := 'localhost';   dbconn.databasename:= 'dbhrs';   dbconn.username:='mizk';   dbconn.password:='123';   dbconn.open;     if dbconn.connected        openhrsdb := true     else         openhrsdb := false; 

but moment change localhost server's ip (on lan), program stops. no errors or warnings. have no clue happening.

here related details may narrow down problem.

1. the program i'm running workstation on same lan server.
2. both machines run ubuntu 12.04 desktop
3. i can access postgres db on server using pgadmin iii, guess it's not firewall issue.
4. i have allowed postgresql ufw , ufw disabled.
5. strangely, when firewall disabled, can ssh server terminal using workstation. when it's enabled, can't

my biggest concern right why pascal program not working when ip number given , message in postgres log.

any inputs appreciated. thanks!

edit: here's more info:

the file postgresql.conf contains these lines:

listen_addresses = '*'
port = 5430

so sorry... here's correct log after connection logging turned on. log file contains after shutdown, restarted , run program:

2014-03-06 18:28:23 ist log: database system shut down @ 2014-03-06 18:28:22 ist 2014-03-06 18:28:23 ist log: connection received: host=[local] 2014-03-06 18:28:23 ist log: incomplete startup packet 2014-03-06 18:28:23 ist log: database system ready accept connections 2014-03-06 18:28:23 ist log: autovacuum launcher started 2014-03-06 18:28:24 ist log: connection received: host=[local] 2014-03-06 18:28:24 ist log: connection authorized: user=postgres database=postgres 2014-03-06 18:28:24 ist log: connection received: host=[local] 2014-03-06 18:28:24 ist log: connection authorized: user=postgres database=postgres 2014-03-06 18:28:25 ist log: connection received: host=[local] 2014-03-06 18:28:25 ist log: connection authorized: user=postgres database=postgres 2014-03-06 18:28:29 ist log: connection received: host=[local] 2014-03-06 18:28:29 ist log: incomplete startup packet

i realised missing when found link talked port: http://lists.lazarus.freepascal.org/pipermail/lazarus/2009-august/044403.html

so included following line in code connect: dbconn.params.text := 'port=5430';

i'm not sure if correct way of doing connection string because thinking there may other parameters in connection string used , above method may over-write params. reason put first line.

so method has worked me.

there's method tried did not work me. use append method (dbconn.params.append)

i found out parameters case-sensitive , had write 'port' ('port' did not work).