Which zotonic branch are you using?
The thing is that zotonic always starts an ssl listener. Which port is used
depends on your zotonic.config. The default is 8443.
Which port is used can be seen in the console.log.
2016-10-13 11:27:01.234 [info] <0.248.0>@zotonic_sup:init:182 Web server
listening on IPv4 any:8000, IPv6 ::8000, SSL :8443
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