I had the same issue. VS 2015 can launch the VS emulator but can't deploy the app.
I was able to solve the issue like this:
- Launch the emulator (F5 in VS, then cancel the deployment using the Build/Cancel menu)
- Click on the chevron icon (?) in the toolbar to the right of the emulator
- Select the Network tab
- Locate the preferred network ip address
- Back in VS, click on the Open Adb Command Prompt toolbar button
- Type adb connect [the emulator ip address]
- Press F5 again in VS
Looks like a VS bug to me.
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