zabbix报错listener failed: zbx_tcp_listen() fatal error: unable to serve on any address

I‘m trying to install zabbix on a new (virtual) server. But i have troubles with the zabbix_agentd on the zabbix server. I get the error below and don‘t know how to fix it... Can someone help me out or point me in the correct direction?

Error logging zabbix_agentd (on zabbix server):
16795:20130325:144550.564 Starting Zabbix Agent [server-adres]. Zabbix 2.0.3 (revision 30485).
16795:20130325:144550.580 listener failed: zbx_tcp_listen() fatal error: unable to serve on any address [[-]:10050]

configuration zabbix_agentd on the zabbix server:

PidFile=/var/run/zabbix/zabbix_agentd.pid
LogFile=/var/log/zabbix/zabbix_agentd.log
DebugLevel=4 # for now
Server=127.0.0.1
ServerActive=127.0.0.1
Hostname=server-adress also tried ip adress, same error


with command netstat:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:10050 0.0.0.0:* LISTEN 31428/./zabbix_agen
tcp 0 0 0.0.0.0:10051 0.0.0.0:* LISTEN 5690/./zabbix_serve