Access to data transmission
You can allow or deny access to data transmission over Wi-Fi 
, mobile networks 
, or over mobile networks when roaming 
for an app by tapping the corresponding icon (see Access to Data Transmission).
Block all connections not allowed by the rules
To block all connections for an app by default, select the Block all connections not allowed by the rules check box. With no allowing rules set, the app will be unable to initiate any connections.
An allowing rule for port 53 is automatically added when enabling the Block all connections not allowed by the rules setting for this app. This rule (set for the DNS, UDP, or ALL protocols) is mandatory for the functioning of allowing rules with domain names.
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To ensure that this setting works as intended in the presence of allowing rules with domain names, disable the use of a private DNS server in your device settings. |
Do not control the app
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The setting is available on devices running Android 5.0 or later. The setting is not available for some system apps. |
Dr.Web Firewall is based on the VPN for Android technology. VPN prevents apps from functioning if they use a technology which is incompatible with VPN, e.g. Wi-Fi Direct. This can result in inability to connect your device to other devices. In this case you should disable Dr.Web Firewall control for the app (or app group) by selecting the Do not control the app check box.
It is recommended to disable Dr.Web Firewall control only for your trusted apps.
When the option is enabled, Dr.Web Firewall does not control network connections of the app even if you customize traffic settings for it in the Dr.Web Firewall settings. The app traffic is not monitored.