Create a new rule in a Web Access Layer. Set the Action to Deny.
In the Destination column, create and set a new Request URL object. Specify the following:
Select Advanced Match.
Set the Host to LinkedIn and change the drop-down to Contains and Set the Path to voyager and set the drop-down to Contains
In the Service column of the rule create a new Protocol Method object. Specify the following:
Set the Protocol to HTTP/HTTPS.
Select POST and Click OK.
Install the policy.
Note: The Possibility exists that in future Linkedin updates may break this rule. You can find the URL and apply the same logic. This word under "Path" is taken from a Policy trace. We have taken a policy trace and identified which request triggers LIKE. You can find this information by using the developer tool in your browser too. The URL which triggers for LIKE is "https://www.linkedin.com/voyager/api/feed/likes". Simply leaving it as voyager may block other Linkedin functionalities.