Hi Igor, Thank you for your immediate reaction and the forwarded solution. As I mentioned I have tried every possible solution I found on the Internet including the one of Martin’s without success. There is no “LocalServiceControl” in my system and even switching the protocol from TCP to UDP did not help me. Downgrade to previous KIS version is not possible unfortunately, but it would be a solution until you find the root cause. As you may learn from other user’s experiences this is not a separate problem, but general happening with KIS versions 21.* BR, Sandor