Little Snitch Help

Managing rules

When we talk about rules and connections in the Connection List, you should keep one thing in mind: A line in Network Monitor does not really represent one connection, it represents a class of connections matching the line’s criteria.

On the first level, the class consists of all connections established by instances of the same program. On the second level, the class is restricted to servers in a particular domain. And on the third level, it’s restricted to particular server names or addresses. That can still be a bunch of connections with various protocols, to various ports and different Internet addresses for the same name.

The Rule Management Button is part of every line in the Connection List. It displays whether all or any connections represented by the line are covered by an allow or deny rule.

When you click the allow- or deny-part of the button, you create a rule which matches exactly the same class of connections as the line represents. We call it an associated rule. This is a very quick and convenient way to create rules for all your connections at any hierarchy level.

The button can have the following states:

STATE DESCRIPTION
Rule Button None of the connections represented by the line is matched by a rule (button is only shown when hovering with the mouse). Any new connections in its class trigger a connection alert or Silent Mode Activity Indication (see below).
Rule Button There is an allow rule associated with the line. It matches the same class of connections as represented by the line.
Rule Button There is a deny rule associated with the line.
Rule Button Connections represented by this line are matched by an allow rule. The rule may match more connections than represented by the line or it may match only a subset. You may find the allow rule at a deeper or higher level, if it can be represented in Network Monitor (port- or protocol-specific rules, rules for “Any Process” cannot be represented).
Rule Button Connections represented by this line are matched by a deny rule, analogous to above.
Rule Button There is an associated allow rule for the line, but some or all connections are also matched by a deny rule which takes precedence over the allow rule. You may find it at a deeper level, if it can be represented in Network Monitor.
Rule Button Analogous to above, but deny and allow exchanged.
Rule Button Some of the rules represented by the line are matched by an allow rule, some by a deny rule. Neither the allow, nor the deny rule matches the same class of connections as represented by the line.
Rule Button At least some of the connections represented by the line are not covered by a rule and had activity during Silent Mode. They would have triggered a connection alert without Silent Mode. Click disclosure triangles to see more properties of the not-yet-covered connections and decide at which level you want to create a rule.
Rule Button A (possibly minimized) connection alert is pending for at least one of the connections represented by the line. The connection is said to be stalled because it’s waiting for you to create a rule, either directly in Network Monitor by clicking the Rule Management Button or via the connection alert. Click disclosure triangles to see more details and create a more specific rule.
Rule Button An extra-high priority deny rule isolates the process from the Internet. This rule was created as a consequence of a failed process identity check. Click the button to delete the rule and accept the modification to the process.

Context Menu

All lines in the Connection List have a context menu shown on right-click. The following options are relevant for rule management:

If an application does not perform as expected and you suspect that Little Snitch may be blocking a connection which is essential for the app, you can analyze the issue in Network Monitor.

Check the Rule Management Button for the application. Is the deny-part red or gray, indicating the existence of a deny rule affecting it? Choose Show Corresponding Rule… from the context menu to see all rules affecting the application at the respective level.


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