as far as Google has translated your post correctly I can tell you that you do not need to worry about VirusScan blocking any port during regular signature update at 17:00 or any other scheduled time. An update is merely a connection to a http or ftp source for downloading files.
On the other hand Virusscan does have a module that is capable of blocking, for example, ports (it can also block opening, writing etc. files, etc.). This is achieved by using/enab ling factory defined rules and/or user defined rules in this module. Not all factory rules are blocking ports, that is, they are not shown as being port blocking rules.
If you are curious whether port blocking occurs or not on Inconcert server, please open accessProtectionLog.txt and locate the line of a particlar time (or scroll to the bottom) and you'll see if blocking occurred or not.