Two apps sharing same port

Hi, I have two applications running on Windows 7 Home premium which both use port 443 - Battlefield 4 and WD MyCloud.
With the remote access enabled on the Mycloud, battlefield4 loses server connectivity after a period, typically 30 minutes or so.
Turning off the Mycloud remote facility removes the battlefield4 server disconnects - but this is not an ideal fix.
I'm new to port forwarding but did attempt to forward port 43 to 491 (random choice on my part). This port config on the BT Router I named bf4. However this did not work and I wonder how the router knows I only want the Battlefied4 forwarded and not
WD Mycloud. Am i going about this the right way?
Any advice gratefully received.
Regards
Graham

Hi,
Skype might use port 443, but all depends on your configuration, you can refer to this guide to change the settings
Which ports need to be open to use Skype for Windows desktop?
https://support.skype.com/en/faq/FA148/which-ports-need-to-be-open-to-use-skype-for-windows-desktop
1) can several running applications use the same port e.g. Skype, BF4 and MyCloud?
Extracted from the MSDN article
The TCP/IP protocol uses a 16-bit number, called a port, to differentiate connections to multiple network applications running on the same machine. If an application is listening on a port, then all TCP traffic for that port goes to that application.
Other applications cannot listen on that port at the same time.
http://msdn.microsoft.com/en-us/library/aa395195(v=vs.110).aspx
I also would like to sharing this link with you
http://stackoverflow.com/questions/1694144/can-two-applications-listen-to-the-same-port
2) If I forward port 443 to a different port on my PC, how does this only work for a specific app?
Personally, the application declares on which port it is listening. to change the port for an applciation, I suggest you contact the application vender, or you need to check with the documentation of that specific application.
NOTE
This
response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you.
Microsoft
does not control these sites and has not tested any software or information found on these sites.
Yolanda Zhu
TechNet Community Support

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