Check if your DayZ server is online
DayZ keeps its game port and its Steam query port apart, and it is the query port that decides whether anyone can see your server.
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The ports DayZ uses
Both are UDP, and the numbers have nothing to do with each other: the query port sits in the Steam range instead of next to the game port. With only the game port open, the server works for anyone who has the address and is hidden from everyone else.
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Still offline? Try this
Forwarded both and still no luck? Let startup run its course. DayZ brings up the central economy and fills the map with loot before it replies to anything, which is not quick, and a modded server stretches it further.