User Manual

The Configuration dialog box is displayed. You are in the configuration section
Application rules.
Activate the Expert mode option.
Select the configuration section Adapter rules.
Click add rule.
Select UDP in the section Incoming rules.
Type the name of the rule in the Section Name of the rule.
Click OK.
Check if the rule is directly above the rule Deny all IP packets.
Warning
This rule is potentially dangerous because it will allow UDP packets without any
filtering! After working with the virtual machine change to your previous security
level.
Virtual Private Network (VPN) Connection is blocked, if the security level of Avira
FireWall is set to medium or high.
FAQ, Tips
Reason: This problem is caused by the last rule Deny all IP packets which discards all
packets that do not comply with any of the rules above it. The type of packages dispatched
by the VPN software (so-called GRE packets) do not fit into the other categories and
therefore they are filtered by this rule.
Replace the rule Deny all IP packets with two new rules which will deny the TCP and
UPD packets. In this way there is the possibility to allow packets of other protocols.
An email sent via a TLS connection has been blocked by Mail Protection.
Reason: Transport Layer Security (TLS: encryption protocol for data transfers on the
Internet) is not supported by Mail Protection at this time. The following options are
available for sending the email:
Use a different port from port 25, which is used by SMTP. This will bypass monitoring
by Mail Protection.
Turn off the TLS encrypted connection and disable TLS support in your email client.
Disable (temporarily) monitoring of outgoing emails by Mail Protection in the
configuration under Mail Protection > Scan.
Webchat is not operational: Chat messages are not displayed; data are being loaded
in the browser.
This phenomenon may occur during chats, which are based on the HTTP protocol with
'transfer-encoding: chunked’.
Avira Professional Security - User Manual (Status: 30 Mar. 2012) 65