only directive is displayed in browser

[sm]

When I try to browse to my newly deployed web service
only the directive is displayed in the browser:

<%@ WebService Language="vb"
Codebehind="FaxingServices.asmx.vb"
Class="WebFaxQueue.FaxingServices" %>

Why is that?

The deployment server is running the same version of the
framework, 1.1.
I tried using the localhost url and the server url.
Could it be a security problem, I am running with
administrator rights, and aspx pages work fine.

thanks in advanced
sm