Hi some body can tell me, how config the network shield to block a specific port or how i do it
thanks!!
Network shield is not a full firewall. avast is not a firewall (just an antivirus).
Generally, you won’t be able to ‘block’ anything, just scan.
Network Shield is a protection against known Internet worms/attacks. It analyses all network traffic and scans it for malicious contents. It can be also taken as a lightweight firewall (or more precisely, an IDS (Intrusion Detection System).
Network Shield protects you from internet worms that spread themselves via various security holes in your system. Typicaly these kind of viruses don’t infect files but instead they attack running processes on your PC (either Windows components or some server programs like SQL Server, IIS etc.). These kind of attacks are not easily catched by ordinary antivirus during file or mail scanning. It is not a duplicate work with Standard Shield. 
ok, thank