Zabbix agent: Allow hostname instead of IP

[Blinkiz]

In zabbix_agentd.conf I can read:

# List of comma delimited IP addresses (or hostnames) of ZABBIX servers.
# No spaces allowed. First entry is used for sending active checks.
# Note that hostnames must resolve hostname->IP address and
# IP address->hostname.

Okay, so I put in the hostname instead.

#Server=77.72.77.11
Server=nms3.mydomain.com

 28572:20111206:131212.065 Listener error: Connection from [77.72.77.11] rejected. Allowed server is [nms3.mydomain.com] 
 28568:20111206:131212.990 In update_cpustats()
 28568:20111206:131212.990 End of update_cpustats()
 28574:20111206:131212.993 In send_buffer() host:'nms3.mydomain.com' port:10051 values:0/100
 28574:20111206:131212.993 End of send_buffer():SUCCEED

nms3.mydomain.com resolve to 77.72.77.11.
It works without problem if I put in the IP number instead.
Zabbix agent version 1.8.5.