Hi,
We have on the Content Server Scanner this erro message in log file :
F-Secure Anti-Virus for Microsoft Exchange Real-Time Scanner cannot connect to F-Secure Content Scanner Server on 127.0.0.1 [defport: 18971] due to error FNP/SCIP error 10. Couldn't send the SCIP/FNP request to the server
We must restart f-secure services to resolve this message, if we don't do that we have many mails you are block by css !
For the moment the don't have respond from f-secure support 
Than you for your help !