Network proxies are devices that sit on the network and allow control of the internet access from the internal network. In general, proxies only support the TCP transport protocol and do not support proxying UDP traffic. However, TCP is not recommended for real-time video conferencing applications. UDP is the protocol of choice for real-time applications as it delivers the best user experience.

For these reasons, if an organization is looking to deploy real-time video conferencing on the network, the best approach is to configure the network to allow the UDP video conferencing traffic through.

StarLeaf video conferencing makes this configuration very simple and secure. StarLeaf has developed advanced firewall/NAT traversal technology, which requires minimal configuration on the network while maintaining a secure network.

Proxy support in StarLeaf

Connections through HTTP proxies are supported on StarLeaf for Windows, Click-to-Call, and the Scheduler for Outlook Exchange. Select one of these below to learn more.

StarLeaf for Windows proxy support

Settings for connecting through proxies on StarLeaf for Windows can be configured in Account > Proxy settings or on the StarLeaf sign-in screen:

Proxy configurations

There are three proxy configurations available as outlined below.

Depending on the chosen configuration, the type of authentication can be Basic, Windows Authentication (NTLM), or None.

Use system settings (default)

Use system settings is selected by default as the proxy configuration type in your settings. To use system settings, you must also select the type of Authentication and complete any further information as outlined in the required parameters below.


If Manual is selected as the proxy configuration type, you must select the type of Authentication and complete any further information as outlined in the required parameters below.

Required parameters Description

Use default credentials

This is the default state of StarLeaf proxy settings. When Use default credentials is selected, StarLeaf uses the saved username and password in Windows Credential Manager.
Username and Password

The username and password already associated with the proxy you are using. If you have never had to enter a username and password for the proxy, Use default credentials might work instead.


StarLeaf only supports proxy types that begin with http:// or https://

http:// will be assumed if neither of these are included in the URL. The proxy URL must be less than 255 characters.


Part of the proxy address.

URLs in the Windows proxy settings or a PAC file might not have a port number. In this case, StarLeaf assumes port 80 if the URL is http or port 443 if the URL is https.

None No additional details required
Using a PAC file

If your setup uses a PAC file, enure that:

  • StarLeaf proxy settings are in Use system settings mode.
  • Windows proxy settings have one of the toggle buttons in the Automatic proxy setup section enabled.

If all other programs are successfully using the proxy, the Windows proxy settings must be correct and should not need to be changed.

No proxy

If No proxy is selected as the Proxy configuration type, no Authentication entry is required.

An overview of the Configuration and Authentication combinations available:

Configuration Authentication Required parameters

Use system settings

Windows Authentication (NTLM)

Use default credentials or

Username and Password

Use system settings


Username and Password
Use system settings None None
Manual Windows Authentication (NTLM) Address


Use default credentials or

Username and Password
Manual Basic


Username and Password
Manual None Address
No proxy None None

Click-to-Call proxy support

Click-to-Call supports connections through proxies that support the use of HTTP CONNECT on port 443. StarLeaf uses HTTP CONNECT to open an end-to-end TCP connection between the browser and the StarLeaf Border Controller. Click-to-Call will use the proxy settings that are configured in the user’s browser settings.

The proxy must allow connections to <subdomain>

StarLeaf Scheduler for Outlook Exchange proxy support

StarLeaf Scheduler for Outlook Exchange Server supports connection through proxies. The add-in supports the HTTP-CONNECT proxy protocol and it uses the proxy configuration from a user’s Internet Explorer proxy settings. The add-in supports all HTTP proxies that Internet Explorer supports. For scheduling meetings, the add-in communicates with