Can't login in iMessage
I can't use iMessage for the last days. Messages were not delivered so I logged out and since then, I can't login. My user and password are OK, I can use them in iTunes or App Store with no problems.
Anyone else has got this problem? I'm using DSL provider Vodafone in Spain. Thank you.
MacBook Pro (13-inch Late 2011), OS X Mountain Lion (10.8.4)