Sorry, I don't mean to hijack this reply, however I follow the steps, the port 8081 does not appear after reload the firewall and restarting mgmt service.
<service id='0017'>
<id>vSphereClient</id>
<rule id='0000'>
<direction>inbound</direction>
<protocol>tcp</protocol>
<porttype>dst</porttype>
<port>902</port>
</rule>
<rule id='0001'>
<direction>inbound</direction>
<protocol>tcp</protocol>
<porttype>dst</porttype>
<port>443</port>
</rule>
<rule id='0002'>
<direction>inbound</direction>
<protocol>tcp</protocol>
<porttype>dst</porttype>
<port>8081</port>
</rule>
<enabled>true</enabled>
<required>false</required>
/etc/vmware/firewall # esxcli network ip connection list | grep 8081
/etc/vmware/firewall #