Flash Login in Chrome

when switching from “Safe Mode” to “Custom Ruleset”, I can’t login any more in a flash application running in Chrome. In Firefox, it works.
In Firefox there was an alert of CIS for the Flash Plugin and I allowed the access, but in Chrome there is no alert.
Has someone an idea?

Ok, I got it: I had to open ports 443 and 843.
Strange, that it still worked in Firefox.