My assumptions from reading the previous posts. If they are wrong let me know.

• SSH works when you have a wired connection
• SSH doesn’t work over a wireless connection
• The wireless device can access the internet
• You can’t ping the pi over a wireless connection

Questions:
Is the computer attempting to connect to the pi wired or wireless?

Things to Check:
You can try checking your routers settings. Some routers are able to isolate each wifi client from each other and the lan. Look for something mentioning isolation.