Update 152->153:Gameserver not reachable

Hi everyone,
after Update from 152 to 153 i can’t connect to gameserver like CS:Go anymore. With 152 everything is working. I can reproduce that behaviour switching between the two versions.
I want to ask for advice where to look for errors because Firewalllog shows nothing to me.
Thanks in advance!

Are there any entries in the IPS log? Maybe a new Suricata rule that is triggered by traffic to the gameserver?

Sorry for the late reply, there is no free time but sunday!
IPS is deactivated so no logs. The is no difference with acitvated IPS

I’ve tried a fresh install with 153 on another Computer. With default settings it is the same problem as mentioned in my first post, no connection to CSGo-Servers.