Hello.

I don't get the solution yet. What I do not understand is whi the rest of the dnn page work fine, except the login module. ¿Is this module using another connection string?

When i install dnn in my PC (localhost),  i use sql server express, and the user "NT AUTHORITY\NETWORK SERVICE" have all permissions to access the database, now in the host i need to connect to SQL Sever 2005 whit this connection string:

<add name="SiteSqlServer" connectionString="data source=localhost;integrated security=SSPI;initial catalog=w1090867_geoandar" />

For all the modules WORK FINE except to the login module. I get the error that i post before. You can try it.

Do i need to change something in the login module or one registre in the some Table?

Again, sorry for my english. I hope you can't understand my.

Yes, i change both:

<connectionStrings>
    <!-- Connection String for SQL Server 2000/2005
    <add name="SiteSqlServer" connectionString="data source=localhost;integrated security=SSPI;initial catalog=w1090867_geoandar" />
 </connectionStrings>

and

  <appSettings>
    <add key="SiteSqlServer" value="data source=localhost;integrated security=SSPI;initial catalog=w1090867_geoandar"/>
....</appSettings>

any ideas?

that was an error of copy/paste 

<connectionStrings>
    <!-- Connection String for SQL Server 2000/2005
    -->
<add name="SiteSqlServer" connectionString="data source=localhost;integrated security=SSPI;initial catalog=w1090867_geoandar" />
 </connectionStrings>

and

  <appSettings>
    <add key="SiteSqlServer" value="data source=localhost;integrated security=SSPI;initial catalog=w1090867_geoandar"/>

.... other tags.....

</appSettings>