If you upgraded SBS to IIS 4.0 and Proxy 2.0, your clients may receive:
87 The parameter is incorrect.
An error occurred while trying to retrieve your URL.
when connecting to a secure web site.
Previous versions of proxy required Sspifilt.dll and W3proxy.dll filter DLLs, which are no longer required. If the registry at:
contains these Filter DLLs, delete the Value Name.