Firing a standalone script

[nmattox]

I'm a Zabbix newbie. What I want to do is (seemingly) very simple: Execute a shell script. The script is located on the Zabbix host, in the ExternalScripts directory. The type is "External check", and the key form is: <scriptname:sh[], with nothing in the square brackets.
It's status is "active", however it's not being executed.
What did I do wrong?
Thanks.

[Calimero]

Are permissions fine (including all path components) ?

How do you now it isn't executed ? What if inside the script you try "date >> /tmp/mylog" ?

[nmattox]

Thank you for the suggestions. Permissions did turn out to be an issue on one of the files being written to. The script is working fine now. Thanks again.