Hi Luciano,
What IE version are you using?
What service are you testing via SICF? Is it the WEBGUI service?
If you do a view source of this "Blank" page - what do you see?
The Portal will not contain any trace entrys - the ITS / WEBGUI trace entrys will be in the Developer Trace files (st22) in the ECC system.
Regards,
Oisin