@Berny in the blocked application, the port is configurable. So, I solved the problem by changing the port assignment in the blocked app. Everything is working fine now. My questions are: Does KPM really need to use the address/port? If it does, should the port be also configurable in KPM? (If the other app was not configurable, I would have been in trouble.)As suggested by another poster, I have already asked the Kaspersky Tech Support these questions. They are supposed get back to me via email. I will post their response here.