HAProxy The service does not start 80 port

[mic.bummer]

Hello, I can not configure the HAProxy service, an error occurs on port 80 when the service starts :-\

Starting frontend SharedFrontend-merged: cannot bind socket [wan adress:80]

Tell me please what is the error of my settings, 80 port is free, the interface pfsense under another port. :-\

Used the latest manual
https://blog.briantruscott.com/how-to-serve-multiple-domains-from-a-single-public-ip-using-haproxy-on-pfsense/

Thank you!!

[mic.bummer]

Topic is closed
The 80 port was busy with the squid service, although the http [80port] parameter was disabled.
After removing the sguid everything works

Diagnostics/ Command Prompt
sockstat -4 -l

Thank you