Why is this happening?
After a period of time, LinkedIn will set the connection to expire that allows NewsCred to publish to LinkedIn. It's normal that the connection expires, LinkedIn does this for a variety of security and technical reasons. When it does happen, all we can do is resync it from our side.
How to fix it:
1. Make sure you are logged into the correct LinkedIn account in your browser.
2. Navigate to Social Settings in CMC.
3. Click the "Sync Account" button for LinkedIn.