Fortigate 60b Custom Service Not Working Port 1935

I have added a custom service for incomming traffic on port 1935 to a Fortigate 60b firewall - all of the preprogrammed ports that they give you to select as typical work fine - ie - HTTP, HTTPS, FTP etc. - but when I create a custom port at 1935 for Flash Media Server Communication under TCP (I even added UDP) it won't show the port open - I do a port scan and all the other ports show open but this one - I need this to work !!!! and I don't know why it won't -

Please help -
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kova4Author Commented:
I figured it out - you need to make the source ports from 1024 to 65535 - and then it works - I guess the orginating port can be anything - however this does not make too much sense - maybe somone can explain this - I will pay to 500 points any way for a good explaination - thanks a bunch

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