And you logged into the router, forwarded port 81 to 192.168.1.12 and saved it?
When BI is open what does canyouseeme.org say for 81?
Also disable in the router uPNP once it's working.
Port Forwarding Portmap Table | ||||||||||||||
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This is my setting for the forward. and on canyouseeme.org port 81 is not seen