After creating a series of hosts using the api, and associating them with a template containing only item type of zabbix trapper. zabbix_sender is unable to update any of those items.

A work around is to edit a host configuration and change something ; it can be anything (ip, dns, proxy port, "connect to" drop down menu, etc). After confirming and using zabbix_sender, the host can have it's items updated.

Unfortunatly, a massive update on the hosts does not work, so does exporting all the hosts and re-importing them after doing a simple change. The only way the work around works is by going single handly on every host files.

I'm using a perl module to interface with the api. Here's the code I've been using to create the hosts :

my $z = Net::Zabbix->new($url,$user,$password);

my @lines = read_file('hostlist.log');

foreach my $hostname (@lines){
    my $host = $z->create('host',{host => $hostname, useip => '1', groups => [{groupid => '8'}], templates => [{templateid =>'10085'}]});
}