To enhance the security of the Splashtop remote sessions, the current certificates of the Splashtop service are generated with SHA 256 (SHA2 256), instead of SHA 128.
However, Windows XP and Windows Server 2003 cannot obtain certificates from a Windows Server 2008-based certification authority (CA) if the CA is configured to use SHA2 256 or higher encryption
So, to be able to log in the streamer at Windows XP and Server 2003 machines, please you need to check the following items:
- Make sure it is XP SP3 and Server 2003 SP2 running on the machine with the steamer installed.
- Run Windows Updates on the machine to make sure the OS is up to date.
- Apply the hotfix from Microsoft: http://support.microsoft.com/kb/968730/en-us. (The link is no longer available due to Microsoft removing support for it.)