Who can help me?

Hi, I installed Horde/IMP with apache 1.3.6 and php4 on Cobalt Raq3. All tests mentionned in the docs are working.http: Now if I enter user name and password in http://mydomaine/horde/imp/ I got the following errors (Note that may database lies on a different machine with ip:10.1.6.5 (in the same subdomaine as machine horde/imp machine, users mail account lies also on a different machine (in my LAN), I enter its FQDN in the configuration wizard. After installation of IMAP I copying c-client.a, mail.h, libc-client.a in /usr/lib/ of the LAN machine, also files rfc822.h, mail.h, linckage.h in /usr/include directory. Warning: Unable to connect to PostgreSQL server: connectDB() -- connect() failed: Connection refused Is the postmaster running (with -i) at '10.1.6.5' and accepting connections on TCP/IP port '5583'? in /home/sites/home/web/horde/imp/lib/db.pgsql on line 266 Warning: Cannot add header information - headers already sent by (output started at /home/sites/home/web/horde/imp/lib/db.pgsql:266) in /home/sites/home/web/horde/lib/horde.lib on line 1156 Warning: Cannot add header information - headers already sent by (output started at /home/sites/home/web/horde/imp/lib/db.pgsql:266) in /home/apache/phplib/session.inc on line 447 Warning: Cannot add header information - headers already sent by (output started at /home/sites/home/web/horde/imp/lib/db.pgsql:266) in /home/apache/phplib/session.inc on line 448 Warning: Cannot add header information - headers already sent by (output started at /home/sites/home/web/horde/imp/lib/db.pgsql:266) in /home/apache/phplib/session.inc on line 449 Warning: Cannot add header information - headers already sent by (output started at /home/sites/home/web/horde/imp/lib/db.pgsql:266) in /home/sites/home/web/horde/lib/horde.lib on line 465