Rule to allow an specific application only

Question

Hello, 
 
 It's possible to create a rule to allow only one application? for example WhatsApp. 
 I tried, but the rule allows extra traffic

rfcat_vk · Accepted Answer

Hi Robert, 
 I have setup a rule at the bottom of my rule table, yours would be at the top so that the rule is used. 
 Please see the following screenshots. I have also but not required included match known users. I use clientless groups to manage access to various rules and networks. 
 The first screenshot shows the selection of the whatsapp applications. There is a screenshot missing and that is the one used to setup the application rule.

I hope you find this helpful? 
 Ian