FAQ, Tips
49
Reason: The virtual machine emulates a network card by means of software. This
emulation encapsulates the data packages of the guest system in special packages (UDP
packages) and routes them via the external gateway back to the host system. Avira
FireWall rejects these packages coming from outside, starting from security level
medium.
To avoid this behavior do the following:
Go to Control Center and select the section
Online protection :: FireWall
.
Click the
Configuration
link.
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.
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 TSL connection has been blocked by MailGuard.
Reason: Transport Layer Security (TLS: encryption protocol for data transfers on the
Internet) is not supported by MailGuard 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 MailGuard.
Turn off the TSL encrypted connection and disable TSL support in your email
client.
Disable (temporarily) monitoring of outgoing emails by MailGuard in the
configuration under MailGuard::Scan.
Webchat is not operational: Chat messages are not displayed; data are being
loaded in the browser.
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