Hello Marco,
Is the traffic reaching the WEB_REMOTE_ACCESS_EXT on port 2081, are you seeing the packets reaching the ASA???
Have you place the ACL pointing to that IP address on port 2081
Regards,
Julio
Cisco Security Engineer
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Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC