Agent "Timeout while waiting for data": test takes less than 3 seconds

[Dicko]

Hi all,

The timeout on the agent is set to the maximum of 30 seconds (service restarted after editing the conf file of course).
When testing...

zabbix_agentd -t vfs.dir.size[c:\path\to\directory]

...after about only 3 seconds already the error "Timeout while wating for data" shows.

Anybody got an idea?