[TYPO3-dev] datasource problem

[Achim Gerber JHF IT]

Hi Everybody,

I am new to developer. I anticipate to write my first extension. I want to
integrate HORDE webmail more in my website.

In order to authenticate my user I need to use the username and password
from HORDE.

My research lead me to the datasource extension in connection with
rlmp_extdbauth. Now comes the problem:

When I register my datasource and test it I see a popup window with the
Error 404 "Object not found"

WHY? 

Can anybody help?

Greetings - Achim