Hi Gerd,

Are your data nodes configured to use ports < 1024? You'll need to rever these to their default ports.

Here's the doc page from the enable security guide that talks about ports. You'll need to do the opposite.

http://www.cloudera.com/content/cloudera-content/cloudera-docs/CM4Ent/latest/Configuring-Hadoop-Secu...

Thanks,

Darren