I returned from vacation and found a new proxy installed in our network:-(
Now i am not able to download Seam 2.1.0.CR1 because of this:

URL:     http://heanet.dl.sourceforge.net/sourceforge/jboss/jboss-seam-2.1.0.CR1.zip
Content-Type:     application/zip
Transferred Bytes:     107034297/107035757
Transfer Time:     252 Seconds
Time Left:     0 Seconds
Transfer Rate:     413.43 KBytes/Second

Status: SORRY THERE WAS A VIRUS ...

Document http://heanet.dl.sourceforge.net/sourceforge/jboss/jboss-seam-2.1.0.CR1.zip contains one or more viruses!

VIRUS: Blocked Mime Type audio/mpeg.

I only want to assure that this file definitly does not contain a virus.