Nov 18, 2008

Avast! and firewall software


What should I know about using avast! 4 in combination with a firewall?
Solution

You may receive warnings from your firewall once you install avast!, because avast! tries to connect to our servers to look for virus definition file updates and for program updates. It also acts as a transparent proxy. You should allow avast! to connect, otherwise the update feature will not work or your will not be able to browse internet websites.

Here is some useful information:

• The components of avast! 4 that should be allowed to connect:
avast.setup
avastXX.setup (where "XX" are some numbers)
aswUpdSv.exe
ashServ.exe
ashWebSv.exe
• How does the update service work?

At first, avast! tries to detect if the computer is connected to the Internet - it sends a 'packet' (message) to one of our servers and waits for reply. If the 'packet' is received, avast! "knows" that the computer is connected and the update may begin. If there´s no reply to the 'packet' sent, avast! will try to ping (connect to) the server again every 40 seconds. If the ping is successful, avast! connects to our server and checks if there´s any new updates available. If there is, avast! will download and install them. If not, avast! will wait for 4 hours and then try to connect and check for updates again. In short: avast! detects the connection to the Internet every 40 seconds and looks for new updates every 4 hours.

• Optimization for dial-up connections

If you use dial-up connection only, there´s another way to detect if the computer is connected to the Internet or not. avast! can elicit the connection status from the modem status - so it will NOT ping our servers every 40 seconds. To set avast! this way, follow these steps:
In Notepad, open the file AVAST4.INI
(C:\PROGRAM FILES\ALWIL SOFTWARE\AVAST4\DATA)
Find section [InetWD]. If this section doesn´t exist, create it.
Into this section insert this row:
UseRAS=1
Save the file and restart your computer.
NOTE: Your avast! build must be 4.0.172 or higher!

• Optimization for permanent connections

If your computer has a permanent connection to the Internet, you can let avast! know this fact so that it can bypass the connection checks. To do so, follow these steps:
In Notepad, open the file AVAST4.INI
(C:\PROGRAM FILES\ALWIL SOFTWARE\AVAST4\DATA)
Find the section [InetWD]. If this section doesn´t exist, create it.
Into this section insert this row:
AssumeAlwaysConnected=1

NOTE: Your avast! build must be 4.0.172 or higher!

 
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