Portkey and Floo in Hogwarts.

[ratalman]

No: HPFGUIDX 81663

bboy_mn:

We have seen 'fire talking', but we have never seen anyone use 
the Floo Network to get into or out of Hogwarts. Although, we 
have seen the fireplaces used to transport a person from one 
room in the castle to another room in the castle. Just because 
the castle protections allow 'fire talking' does not mean the 
fireplaces do not have additional charms to prevent the transport 
of whole bodies.

Robyn:

But don't forget that Dumbledore arrives at his office via fireplace 
after the showdown at the Ministry of Magic:

"The empty fireplace burst into emerald-green flame, making 
Harry leap away from the door, staring at the man spinning 
inside the grate.  As Dumbledore's tall form unfolded itself from 
the fire, the wizards and witches on the surrounding walls jerked 
awake."  (OoP, p. 822, US ed.)

This is the only instance of floo travel to Hogwarts from outside 
the castle that I can think of.  Maybe Dumbledore, as 
headmaster, is the only wizard who can do so, and maybe 
because his office, and therefore, fireplace, is a specially 
protected space (Umbridge could not gain access to the 
headmaster's office whilst Dumbledore was away), but, then 
again, maybe not....

Robyn