You didn't post a transaction ID.    Without that, all that can be suggested is that there was a transaction in which 2.44 BTC has been received to that address and then that amount was spent to 1FyySthyrzTbqqqjQL6QczwncHweMzX5NR (for 2.4395 BTC).  Both of those have confirmed.

 - https://blockchain.info/address/15s17qYWvj9vTJrjKnywGPiduM7NvbhNx7

If your client isn't showing that as confirmed, then your client probably hasn't reached "sync" yet. 

Now if you have some other transaction for this address then there's varying reasons why the network doesn't know about them but that's probably not what you are describing.