The American Hockey League works as a development league for National Hockey League clubs, because of that AHL employees often have access to NHL information. That information is always intended to remain confidential.
The Senators were very vague surrounding their reasoning, but this morning additional information leaked on the situation. According to Claire Hanna of TSN, Troy was terminated for leaking private information to other NHL teams.
To make this situation even more awkward, Troy's younger brother Trent, still works for the Senators as an Assistant General Manager. Leaking information to other teams is a definite reason for termination, and if proven true will likely cost Troy any future career within the industry.