Not seeing any HTTPCode_Backend Response on the Classic Load Balancer logs

Question

Hello,  
I have a classic LB with TCP 443 port forwarding to my backend instances, where I have SSL certificate configured on IIS.   
IIS logging is enabled.   
When deliberately hitting some URLs with wrong parameters, I get 403 errors from IIS, but I do not see any HTTPCode_Backend in teh CLoudwatch   
I don't see it in the Athena when trying to analyze the ELB logs either.   
elb_repsonse_code and backend_response_code in Athena are both empty.  
  
Can anyone point me in the troubleshooting direction?>  
  
Thanks

Answer

Ok, figured it out.   
Looks like my only option to have the HTTPBackend_response_2xx/3xx/4xx/5xx in the cloudwatch metrics is to switch to HTTPS listener, instead of TCP:443.

Not seeing any HTTPCode_Backend Response on the Classic Load Balancer logs

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