Forums Bug Reports cannot change default DCC Server port 59

I try to connect to a mIRC server which is located in the same LAN
behind the NAT of a FritzBox 7490.

After changeing the DCC server listen port
(Options->DCC->Server->Listen on Port) in the CLIENT
to the SAME port as actually the server is listening to,
I'm getting these results:

a) /dcc fserve URL:port
result: nothing happens!

b/works!) /dcc fserve URL
result: I'm getting the 'File Server Warning'
popup window on the server side - after clicking 'OK' the connection is working!
On the client I can read this line:
Client: URL (Port I defined in the client's settings!)

c/works!) /dcc URL port
result: same as b)! - connection works!
No change if I use a DIFFERENT port here!
It really looks as if the mIRC client is using the port that has been defined
as it's DCC server port, even if that server ISN'T enabled.

As I cannot test it with a client outside of my LAN I'm curious
if the behaviour is to be expected the same...

Ah, btw.: Is mIRC capable of SDCC connections?
And if not are there any plans to implement it?