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Cannot open any ports via NAT or firewall rule but existing ones work?

Hi All - I am trying to enable remote access for the Plex server and it requires the opening of ports in the 32xx range. 

I enabled the following DNAT rule: TCP 1:65535 → 32400.

Unfortunately the port remains closed when testing using this site and on Plex Server's network config:
Open Port Check Tool

I tried a variety of port numbers and none of them seemed to work which is very baffling. As a last resort, I tried some common port used by RDP such as 3389 and the connection worked....

Lastly, I am also using the following rule on my UTM:

Internal (Network) -> any -> any

I've also reviewed the firewall log and below is the dropped packet:

2015:10:19-12:30:19 homestation ulogd[6592]: id="2001" severity="info" sys="SecureNet" sub="packetfilter" name="Packet dropped" action="drop" fwrule="60001" initf="ppp0" srcip="54.193.168.189" dstip="24.140.238.16" proto="6" length="60" tos="0x00" prec="0x00" ttl="47" srcport="2985" dstport="32400" tcpflags="SYN"


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