SSL certificate can not be installed on domain on windows 2003 server.
The following error is shown in hsphere.log file
Psoft.HSphere.Transport.Protocols.ProtocolException: System.IO.FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)
msvcr71.dll library used by libeay32.dll that is in turn used by H-Sphere is missing in system32 folder.
Download msvcr71.dll file (attached file is for Windows 2003 R2).