Citrix Web Application Firewall : 400 Bad Request

Getting the error "The request failed with HTTP status 400:." when opening an application hosted using a Load balancing Virtual Server when Application Firewall Profile is bound. Sample entry seen in /var/log/ns.log : Nov 22 09:49:45 172.25.224.219 11/22/2018:09:49:45 GMT qahvpxlb09 0-PPE-1 :...