DynDns problem client!

Hey all,i have one problem...i open dydns server and in my client i can normal enter in my server,but other cant because they get log out when always try login in client....i think its problem in exe....so can anyone help me how i can create client exe for dydns server? See the video ::confused:
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Hello, are you sure you do not ave missed some step ... This problem usually occurs when you skip a step or do something wrong in check and let me know :)

hmm i do all good.. but i dont understand this problem i can logging on but other people cant :/