Not redirect to the original page in cross site authentication

hi,
We have multiple web applications(in one machine), we want all those  web applications to be authenticated by a single login page, that is, after logging in, you can visit any page in all those web applications. The login page is placed in a dedicated web application called Membership. The following is the config of the Membership web app.
<connectionStrings>
    <add name="MyMembershipConnString" connectionString="server=.;database=aspnetdb;trusted_connection=true" providerName="System.Data.SqlClient"/>
  </connectionStrings>
 
<membership defaultProvider="MyMembershipProvider">
      <providers>
        <add name="MyMembershipProvider" type="System.Web.Security.SqlMembershipProvider"
        connectio ...