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Dropping cookie **** from request due to missing/invalid signature

Hi All

I have recently enabled WAF and it works fine. I am getting the following warning message 


[warn] [client 82.***.***.100] Dropping cookie 'nas_tree_y' from request due to missing/invalid signature, referer: https://*****.dyndns.org:****/cgi-bin/html/login.html?3.5.1.1002T 


I am connecting via SSL and I have the following options enabled:
NAS Firewall profile 
Mode: reject 
Attack Patterns: Cross Site Scripting
                     SQL Injection 
 
Cookie signing: enabled 
URL Hardening: disabled 
Form Hardening: disabled 
AntiVirus scanning: Single Scan (Uploads only) 
Block clients with bad reputation: enabled 
 
What do I need to do to fix this warning? Is it something I need to do on the webserver(i.e. enter the Cookie Signing Secret on the web server)?

Also I've noticed that the dashboard shows "Web Application Security is active, 0 requests served today" even though I am having multiple connections to the web server

THanks


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