New GILDA usage rule

Tutorials have precedence with respect to testing and pre-porting of applications on GILDA. In order to minimize the interference of testing during practicals, a mechanism has been put in place that filters ALL GILDA users out the gridmap-files of the GILDA RBs during tutorials. Look at the page https://gilda.ct.infn.it/tutorials.html to see when you can use GILDA for testing and when you can not.
If you try to submit jobs during a "forbidden" period you will most probably get errors like this:

Selected Virtual Organisation name (from --vo option): gilda
**** Error: API_NATIVE_ERROR ****
Error while calling the "NSClient::multi" native api
AuthenticationException: Failed to establish security context...
**** Error: UI_NO_NS_CONTACT ****
Unable to contact any Network Server

Please, take this new usage rule into account when you plan your testing activity.
IMPORTANT: if you are the organizer/tutor of a forthcoming tutorial, please inform the GILDA Team (using the support system http://gilda-support.ct.infn.it) as soon as possible and we will put your DN in the white list so that you can continue your light testing.