HP Officejet 6700 Premium Not connected for eprint

Good evening,

I bought a officejet 6700 Premium and I installed it 10 days ago, The printers worked properly for a couple of days.

Now, if I log on in ePrintcentre, a message says that the printer is not connected.

If I launch a print using the wireless net (e.g using my IPHONE while I'm at home and using my home wireless) it works.

But if I launch a print @ my HPe address the printer doesn't work and remains in pending message (on eprint centre) for a while and then become "failed".

Is there something to set in the printer panel?

Thank you very much