# UA Settings

This section describes the general communication settings of the OPC UA server.

**Allow Anonymous Login:** allows OPC UA client not to provide username and password when opening a connection.

**Enable UA TCP Endpoint:** allows connection to the OPC UA Server using the UA TCP protocol (binary protocol).

{% hint style="info" %}
Please note that by default anonymous connection to the OPC UA server is allowed
{% endhint %}

**Max Notification Queue Size:** specifies the maximum number of notifications stored in the queue for each monitored data change item.

**Max Notifications per Publish:** indicates the maximum number of messages sent in one publication response.

**Max Message Queue Size:** specifies the maximum number of sent messages that are saved in the queue for each subscription.

**Min Session Timeout:** indicates the minimum number of milliseconds during which the session remains open.

**Max Session Timeout:** specifies the maximum number of milliseconds during which the session remains open.

**Max Session Count:** indicates the maximum number of simultaneous sessions.

**Max Browse Continuation Points:** specifies the maximum number of continuation points used in Browse/BrowseNext operations.

**Min Subscription Lifetime:** sets the minimum subscription lifetime, which can be specified by OPC UA client when creating a subscription.

**Max Subscription Lifetime:** sets the maximum subscription lifetime, which can be specified by OPC UA client when creating a subscription.

**Min Publishing Interval:** sets the minimum subscription publishing interval, which can be specified by OPC UA client when creating a subscription.

**Max Publishing Interval:** sets the maximum subscription publishing interval, which can be specified by OPC UA client when creating a subscription.

**Min Sampling Interval:** sets the minimum sampling rate, which can be specified by OPC UA client when creating a monitoring item.

After changing and synchronizing the settings described above the OPC UA server will be automatically restarted.