I found a lab case from June, 2012, which the problem was identified as being with INET, and, when using Encrypted Communications (ECC), and was going to be fixed in subsequent General Release patch. It appears that this is part of the Core patch
Your note says you are on DP 6.20. I advise that you download and install the DP 6.21 patch bundle, plus subsequent patches issued after the patch bundle
The patch bundle and subsequent can be found, and downloaded from this URL:
http://support.openview.hp.com/selfsolve/patches
A HP Passport is requird to obtain the patches
Also, please keep in mind that support for DP 6.2x will go away on December 31, and you should start making plans to upgrade to a supported version, I recomend DP 7.x