I was wondering if it is common to see zero confirmations for a transaction after over two hours. I did not include any transaction reward, but I have never had any issues with that before. Quite a few blocks have been found and the transaction wasn't confirmed in any of them  . Should I be worried? Here is the wallet address if it helps:

15s17qYWvj9vTJrjKnywGPiduM7NvbhNx7

Transaction ID:
2176854c0ed2e2a8e6c2f4aeb429e4548452ba59088cc63ff36634cdeae062a4

If anyone could put my mind at ease, that would be great. 2.44 btcs is a lot these days...

Cheers!

[Edit]
5 hours and blockchain has no record of the transaction: http://blockchain.info/search/2176854c0ed2e2a8e6c2f4aeb429e4548452ba59088cc63ff36634cdeae062a4