Web service Error

I got error when i am trying to run web service

<s:Envelope xmlns:s="">schemas.xmlsoap.org/…/">
<s:Body>
<s:Fault>

a:Microsoft.Dynamics.Nav.Types.NavDatabasePasswordException


The login failed when connecting to SQL Server DB01.


schemas.microsoft.com/.../">](http://schemas.microsoft.com/2003/10/Serialization/)
The login failed when connecting to SQL Server DB01.


</s:Fault>
</s:Body>
</s:Envelope>

Thanks in advance