Service Pack 6 (TSE SP6) provides the latest updates to Microsoft Windows NT Server 4.0 Terminal Server Edition.
This release is only available in High Encryption (128-bit) for Intel (x86) platforms.
IMPORTANT: If your terminal server is running the standard encryption (40-bit) version of Windows NT 4.0, Terminal Server Edition, and your Remote Desktop Protocol (RDP) encryption level is set to high, your client computers might be unable to connect after you apply TSE SP6. To correct this, first apply TSE SP6 on your server, and then upgrade your client computers using the Terminal Server Client Creator tool. Alternatively, you can lower your RDP encryption level to low or medium settings. This does not apply to Citrix ICA clients.