Cannot install an existing certificate from control-panel error: "Failed to open PFX file"
This is a known bug in the GUI(3.6 SD for Win2K) application that is scheduled to be fixed in UP2 ,
You can manually install the certificate from IIS, by following these steps:
1. Go to the VDS in IIS
2. Right Click and select"properties"
3. Go to the "Directory Security" tab
4. Click "server certificate" and complete the wizard.