Removed wrong constant string use.

src/main/java/org/gcube/portal/oidc/lr62/OpenIdConnectLoginFilter.java

@@ -63,7 +63,7 @@ public class OpenIdConnectLoginFilter extends BaseFilter {
                 // The auto login class will perform the portal auto login using the token
             } else {
                 String oidcRedirectURL = OpenIdConnectRESTHelper.buildLoginRequestURL(
-                        configuration.getAuthorizationURL(), "preprod2.d4science.org" , sessionId,
+                        configuration.getAuthorizationURL(), request.getServerName(), sessionId,
                         request.getRequestURL().toString());
 
                 if (log.isDebugEnabled()) {