Logon to the shadow instance

Hi,

In processing upgrade to EHP6, we are at the step Preprocessing_Update_Preparation.

We musst logon now to the shadow instance in order to be able to include the repository modifications :

     You must now include your repository modifications in the new SAP import.

     The program has found 8 modified objects that you need to adjust and 0 objects are automatically maintained by import of an adjustment transport      that      you have included into this procedure.

      To adjust your repository, proceed as follows:

1. Logon to the shadow instance as user DDIC in client 000 on server dev_server instance 02.
2. Set the 'System Change' option with transaction SE06.
3. Logon to the shadow instance as ordinary user and make adjustments with transaction SPDD. For more information, see the update guide.

the shadow instance was started : /usr/sap/SID/SUM/abap/bin/SAPup startshd

If I try to open the system from saplogon, it returns the error : "partner 'server:sapdp02' not reached"

How can we logon to the shadow instance?

Thanks in advance

Regards