NAV 2009 - Access to Public Web Services Password Exception

Hi all.

We're having troubles setting up external connection to NAV Web Services through public IP.

We have no errors in the BPA.

Does anyone knows if there is a particularly setting or configuration to achieve this?

Currently, if we access, we've the following error:

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"&gt;
<s:Body>
<s:Fault>
<faultcode xmlns:a="urn:microsoft-dynamics-schemas/error">
a:Microsoft.Dynamics.Nav.Types.NavDatabasePasswordException
</faultcode>
<faultstring xml:lang="pt-PT">
The login failed when connecting to SQL Server SRVVMCDFPDB01.
</faultstring>
<detail>
<string xmlns="http://schemas.microsoft.com/2003/10/Serialization/"&gt;
The login failed when connecting to SQL Server SRVVMCDFPDB01.
</string>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>

Thanks in advance.