- verifying the firewall settings between the SCCM und the DP
- verifying WMI connection with the DP using IPSec and WMIExplorer
- verifying IIS Settings on the DP (IIS 6 WMI Compatibility and Windows Authentication)
the issue was found. The cause of the issue was the time on the DP server. It was off for an hour. After the time of the DP server was corrected the DP started to work again.