I am running Axis Camera Station software to manage security cameras. Camera Station is based on Windows Communication Foundation. For some time now, I have been getting security errors when logging into the Client application. >>>> System.ServiceModel.Security.MessageSecurityException, Unable to decrypt an encrypted data block. Please verify that the encryption algorithm and keys used by the sender and receiver match. <<<< I finally resorted to logging into the Client App from a virtual machine on my network (not running NOD32). Axis has been working on the problem, but could not find a solution. In searching the web, I ran across the following link: http://faq.reversevision.com/doku.php?id=faq:installation:eset.nod32.antivirus.interference This is likely what has been causing the problem, and have been incorrectly pressing Axis Communications to fix it. The problem still occurs when I temporarily disable NOD32. My next step will be to uninstall NOD32 and see if the problem disappears. Are the Eset representatives here aware of this problem, and is there a fix available? Running Windows 7 SP1 x64 EAV 126.96.36.199 Link to Application - http://www.axis.com/products/cam_station_software/one.htm I am using the current version of ACS - 3.51.29 EDIT: Yep, that was it. I uninstalled NOD32 and I can log in to Axis Camera Station Client without a problem. Arrrgh...back to Security Essentials for a while until this gets sorted out.