JSI Tip 0928. SMS Remote Control window closes without warning.

If this happems on your SP4 SMS Site Server, I suspect you installed SMS 1.2 SP4 after Windows NT 4.0 SP4.

The Sightnt.dll from NT SP4 was replaced with the older one from SMS.
Copy the NT 4.0 SP4 version to <sms_root_dir>\Site.srv\<Platform.bin>.

You must also update the clients if the SMS version overwrote the clients SP4 version.