my 5th generation iPod touch wont sync via wifi
i have an iPod touch 5 on ios 8.1 which i sync very often with my compute which runs windows 8.1 rand i turned on iTunes wi-fi sync feature but when i go to settings>general>iTunes wi-fi Sync and then select my pc on the list it says that it'll sync when my com puter is available but i have my computer turned on and itunes running and connected to the same wi-fi network. how do I fix this problem.
sorry for bad english
iPod touch, iOS 8.1.3, 5th generation 32 gb