This error will show if either

1) You've entered the license key incorrectly, such as an extra character. Check that you copied/pasted the right thing. Sometimes, you may need to manually type the license key to be sure there are no extra invisible characters picked up when using copy/paste.

2) There isn't access to the licensing server for the plugin. This could be because of a firewall. Make sure https://licensing.siliconpublishing.com is whitelisted. It uses the standard https port, 443.

3) You use a proxy and Connector hasn't auto-detected it's settings. To configure your proxy, edit the SCxxx.properties file for your Connector. (i.e. SC.properties or SCLibris.properties, etc.) This file can be found at 

Mac: /Users/username/Library/Preferences/SiliconConnector/SCxxx.properties

Windows: C:\Users\username\AppData\Local\SiliconConnector\SCxxx.properties


Here's an example SC.properties file from DALIM ES CC Connector:

#—————————————————————————————————————————————————————————————————————————————————————————————————-
# GENERAL CONNECTOR SETTINGS
#
# remove the leading # from the property to override the default value
#—————————————————————————————————————————————————————————————————————————————————————————————————-

#sc.link_status_interval is the number of seconds between link status updates (3 - 300)
#sc.link_status_interval=60

#sc.connect_timeout is the number of seconds to wait for a server to connect (0 for system default)
#sc.connect_timeout=120

#sc.html_linking specifies whether to support generic HTTP linking (true or false)
#sc.html_linking=true

#sc.connector_url is the URL targeted by the "Go to DALIM...” menu item
#sc.connector_url=http://www.dalim.com/


#—————————————————————————————————————————————————————————————————————————————————————————————————-
# HTTP PROXY SETTINGS
#
# remove the leading # from the property and set a valid value to use it
#—————————————————————————————————————————————————————————————————————————————————————————————————-

#sc.http.proxy_auto_detect specifies whether to automatically detect the system’s HTTP proxy settings
#sc.http.proxy_auto_detect=true

#sc.http.proxy_server is the HTTP proxy server to use
#sc.http.proxy_server=proxyserver.com

#sc.http.proxy_port is the HTTP proxy port to use
#sc.http.proxy_port=80

#sc.http.proxy_id is the HTTP proxy user id
#sc.http.proxy_id=user_id

#sc.http.proxy_pw is the HTTP proxy user password
#sc.http.proxy_pw=password


#—————————————————————————————————————————————————————————————————————————————————————————————————-
# HTTPS PROXY SETTINGS
#
# remove the leading # from the property and set a valid value to use it
#—————————————————————————————————————————————————————————————————————————————————————————————————-

#sc.https.proxy_auto_detect specifies whether to automatically detect the system’s HTTPS proxy settings (true or false)
#sc.https.proxy_auto_detect=true

#sc.https.proxy_server is the HTTPS proxy server to use
#sc.https.proxy_server=proxyserver.com

#sc.https.proxy_port is the HTTPS proxy port to use
#sc.https.proxy_port=80

#sc.https.proxy_id is the HTTPS proxy user id
#sc.https.proxy_id=user_id

#sc.https.proxy_pw is the HTTPS proxy user password
#sc.https.proxy_pw=password

#sc.https.verify_ssl_certifcate specifies whether to verify the peer's SSL certificate (true or false)
#sc.https.verify_ssl_certifcate=true




If you still get this error message, contact Silicon Publishing to troubleshoot further.