[FS#1334] port forwarding not working

[LEDE Bugs]

The following task has a new comment added:

FS#1334 - port forwarding not working
User who did this - Robert Muth (robertmuth)

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Note sure if these experiments done from inside the router are meaningful, 
but the problem also occurs when coming from the outside:

 wget http://192.168.1.111:8877
--2018-02-08 01:06:24--  http://192.168.1.111:8877/
Connecting to 192.168.1.111:8877... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2711 (2.6K) [text/html]
Saving to: 'index.html'


index.html               100%[==================================>]   2.65K  --.-KB/s    in 0s      

2018-02-08 01:06:24 (45.3 MB/s) - 'index.html' saved [2711/2711]



BUT:

wget http://---wan-ip---:8877
--2018-02-08 01:08:01--  http://---wan-ip---:8877/
Connecting to ---wan-ip---:8877... failed: Connection refused.


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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1334#comment4275