your SEPM IPS is detecting it
try this
open sepm
.1Go to Policies --> Intrusion Prevention Policies
2.Right Click Edit --> On the Exceptions tab
3.Click Add --> Look for the ID ( Skype id)
4.click Next
5. On the Signature Action select "Allow" and click OK.
For notification disabling follow this id.
1. Go to Clients tab in SEPM, then the client group you want to remove this ability from.
2. Click the Policies tab on the right, then expand 'Location-specific Settings'.
3. Click on 'Server Control', then Customize.
4. In the Intrusion Prevention Notifications Uncheck the "Display Intrusion Prevention notifications."