Several cases have been reported for “Error 1920. Service DraftSight API Service (DraftSight API Service) failed to start” while trying to install DraftSight.

The error has been found to occur when the port used for the DraftSight API Service, port 7776, is unavailable.  In these cases, another service “Check Point SSL Network Extender” was already using the same port. The workaround is to temporarily disable this service, install DraftSight, and re-enable it.

If you get this error message, check if the “Check Point SSL Network Extender” service appears in the list of services running on your machine.

1. On Windows 7 or Vista, enter Services in the Start menu. On Windows XP, click on Start, Control Panel, Administrative Tools, and Services.

2. You should see the DraftSight API Service; in addition look for “Check Point SSL Network Extender”.

3. Right-click on the “Check Point SSL Network Extender” service and select Stop.

4. Install DraftSight.

5. After installing DraftSight, go back to the Services window, stop the Draftsight API service and re-start the “Check Point SSL Network Extender” service (right-click on it and select Start).

What is the DraftSight API Service used for?

This service is required when using the API that involves JavaScript. The API requiring Visual Basic, VB/C # .Net and C++ is not affected by this service.

Tip: How can we verify which ports are being used?

The command “netstat” displays protocol statistics and current TCP/IP network connections.

Several options are possible:

netstat –a will display all connections and listening ports. Look for port 7776:

netstat –a  –b will display all connections and listening ports with the executable involved in creating the connection:

This would be useful to identify the application using the desired port.