What does the “unknown” SIC status shown on SmartConsole mean?

What does the “unknown” SIC status shown on SmartConsole mean?
A . The SMS can contact the Security Gateway but cannot establish Secure Internal Communication.
B . SIC activation key requires a reset.
C . The SIC activation key is not known by any administrator.
D . There is no connection between the Security Gateway and SM

Answer: D

Explanation:

The most typical status is Communicating. Any other status indicates that the SIC communication is problematic. For example, if the SIC status is Unknown then there is no connection between the Gateway and the Security Management server. If the SIC status is Not Communicating, the Security Management server is able to contact the gateway, but SIC communication cannot be established.

Reference: https://sc1.checkpoint.com/documents/R76/CP_R76_SecMan_WebAdmin/html_frameset.htm?topic=documents/R76/CP_R76_SecMan_WebAdmin/118037