F-Secure has published a hotfix regarding Client Security 10.00. This hotfix solves the issue that the access to some websites is blocked, when the Stateful Inspection level is set to RFC in the Policy Manager console. This setting is accessible in the Advanced mode from: Policy tab > F-Secure Internet Shield > Firewall Engine > Stateful Inspection Level.
Note: Restart is not required by the hotfix but is needed to finalize the installation.
You can download the hotfix files from the Client Security 10.00 Downloads web page.
Feel free to post questions or discuss about this hotfix in this thread.