OCS Inventory Problem mit Paketerstellung

Hello,

i have problems to deploy machines. The server is installed on a RHEL5.4 Linux Workstation and it´s working good. Now i´ve wanted to create packages for windows xp clients. I did the following:
1. Create certificate on the ocs-server with:
openssl genrsa -out server.key 1024
openssl req -outform PEM -new -key server.key -x509 -days 1825 -out server.crt
2. Then i filled out the certificate. it creates a server.crt and server.key which i´ve copied in the folder /etc/pki/tls/certs and /etc/pki/tls/private
3. then i´ve restartet httpd
4. Now i´ve copied the certificate /etc/pki/tls/certs/server.crt to my windows machine into the file C:\ProgramFiles\OCS\cert.pem
5. Now i´ve created a deploy-package (it´s a zip files with LAUNCH:EXECUTE
6. After that i´ve typed HTTPS-URL :https://hostname.web.domain.com/download
Fragments-URL :http://hostname.web.domain.com/download
7. After that i can find only a info file in the directory /var/lib/ocsinventory-reports/download/123456789 where the information is written how i set up the deploy-package
8. When i start ocs_contact.exe i see that it creates a directory downloads and i hoped that now the installation will be done. After waiting and waiting there is nothing - no installation.
9. in the log file i found the following:
HTTP SERVER: Connection WITHOUT proxy
WMI Connect: Trying to connect to WMI namespace root\cimv2 on device <Localhost>...OK.
Registry Connect: Trying to connect to HKEY_LOCAL_MACHINE on device <Localhost>...OK.
CHECKINGS: read <XP-FRITZ-2009-11-26-16-37-49> and <00:50:56:00:00:11> in ocsinventory.dat
IpHlpAPI GetNetworkAdapters...
IpHlpAPI GetNetworkAdapters: Calling GetIfTable to determine network adapter properties...OK
IpHlpAPI GetNetworkAdapters: Calling GetAdapterInfo to determine IP Infos...OK
IpHlpAPI GetNetworkAdapters: OK (1 objects).
CHECKINGS: write <XP-hostname-2009-11-26-16-37-49> and <00:50:56:00:00:11> in ocsinventory.dat
HTTP SERVER: Creating CInternetSession to get inventory parameters...OK.
HTTP SERVER: Getting HTTP Connection to server hostname.domain.com port 80 using no authentication...OK.
HTTP SERVER: Sending prolog query...HTTP status 200 OK
OK.
HTTP SERVER: Receiving prolog response...OK.
DOWNLOAD: Package history file successfully cleaned for duplicate IDs
ERROR: DOWNLOAD: loading CA file and/or directory
ERROR:error:00000000:lib(0):func(0):reason(0)
DOWNLOAD: Info file for package 1272977656 is located at : hostname.domain.com:443/download
ERROR: DOWNLOAD: SSL: -Error with certificate at depth: 0
ERROR: DOWNLOAD: SSL: issuer = /C=UK/ST=England/L=London/O=Company/OU=Department/CN=hostname.domain.com/emailAddress=info@company.com
ERROR: DOWNLOAD: SSL: subject = /C=UK/ST=England/L=London/O=Company/OU=Department/CN=hostname.domain.com/emailAddress=info@company.com
ERROR: DOWNLOAD: SSL: err 18:self signed certificate
ERROR:error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

CAN SOMEONE TELL ME WHATS WRONG??????????????????
THANK YOU!!!!