Unable to login to iTunes from Os X

Hello,

As of this morning I cannot login anymore into iTunes from my iMac.

I don't receive an error message, just when I try to sign in nothing happens.

I tried to go through the steps described in Advanced steps for fixing issues with iTunes Store connection - Apple Support , but nothing seems to work.

I thought also that there might be an outage with iTunes but again at https://www.apple.com/support/systemstatus/ there are no outages detected.

Help

Luca