Blue Iris

When using the blue Iris 5 remote setup I have a "Red X" on the web server page - HTTP Listening Port 81 Web request Error 12002

I am pretty sure i have open Port 81 on my ATT Router. What else can i check to see if the port is open? also is port just"81" or is it "8081" ( hope that make sense)
also which option should i select TCP/UDP or a combo of both?

Try this:

https://www.canyouseeme.org/

CanYouSeeMe.org - Open Port Check Tool

"A free utility for remotely verifying if a port is open or closed. It is useful to users who wish to verify port forwarding and check to see if a server is running or a firewall or ISP is blocking certain ports."

the port must not be open, I cannot see my IP address. I will keep trying to open this port