We have installed a DLL called "acecrypt.dll" from location D:/Program Files/DSX/AceEncrypt/. This DLL cannot be used by any domain setup through Plesk. We tried to use it through our domain xyz.com and did a second attempt by creating a new domain, admin.xyz.com, and it still didn't work. When we created a New Web Site directly through RDC and IIS, the DLL works correctly. Example: http://184.108.40.206/test.asp = correct http://admin.xyz.com/test.asp = bad Our guess is that Plesk is not assigning the right permissions (default IIS anonymous user, guest user, etc.) when we create a domain through the control panel. But, when we created a site directly through IIS, the default permissions and anonymous user account allow the system to access the DLL. Please advise and thank you in advance for your help.