System Requirements

Please refer to the appropriate section:

Operating Systems
- Microsoft Windows
- MacOS
- Linux
- Chrome OS
- Mobile
Internet Connection
Supported Connection Methods
Supported Network Types
Supported Connection Types

Supported web browsers (for ISL Light for web)

Operating Systems

Microsoft Windows

Client Version	Server Version	ISL Light Version
Microsoft Windows 11	Microsoft Windows Server 2025	ISL Light 4.0.0 - The latest version available
	Microsoft Windows Server 2022	ISL Light 4.0.0 - The latest version available
	Microsoft Windows Server 2019	ISL Light 4.0.0 - The latest version available
Microsoft Windows 10 (32-bit and 64-bit)	Microsoft Windows Server 2016	ISL Light 4.0.0 - The latest version available
Microsoft Windows 8.1 (32-bit and 64-bit)	Microsoft Windows Server 2012 R2	ISL Light 4.0.0 - The latest version available
Microsoft Windows 8 (32-bit and 64-bit)	Microsoft Windows Server 2012	ISL Light 4.0.0 - The latest version available
Microsoft Windows 7 (32-bit and 64-bit)	Microsoft Windows Server 2008 R2	ISL Light 4.0.0 - The latest version available
Microsoft Windows Vista (32-bit and 64-bit)	Microsoft Windows Server 2008	ISL Light 3.0.0 - 3.5.5
Windows XP (32-bit and 64-bit)	Microsoft Windows Server 2003 R2	ISL Light 3.0.0 - 3.5.5
	Microsoft Windows Server 2003	ISL Light 3.0.0 - 3.5.5

Note: Windows devices with ARM architecture are not supported.

Mac OS

The Client Version	The ISL Light Version
macOS 15.X Sequoia	ISL Light 4.0.0 - The latest version available
macOS 14.X Sonoma	ISL Light 4.0.0 - The latest version available
macOS 13.X Ventura	ISL Light 4.0.0 - The latest version available
macOS 12.X Monterey	ISL Light 4.0.0 - The latest version available
macOS 11.X Big Sur	ISL Light 4.0.0 - The latest version available
macOS 10.15 Catalina	ISL Light 4.0.0 - The latest version available
macOS 10.14 Mojave	ISL Light 4.0.0 - The latest version available
macOS 10.13 High Sierra	ISL Light 4.0.0 - 4.4.2031.107
macOS 10.12 Sierra	ISL Light 4.0.0 - 4.4.2031.107
OS X 10.11 El Capitan	ISL Light 4.0.0 - 4.4.2031.107
OS X 10.10 Yosemite	ISL Light 4.0.0 - 4.4.2031.107
OS X 10.9 Mavericks	ISL Light 4.0.0 - 4.4.2031.107
OS X 10.8 Mountain Lion	ISL Light 4.0.0 - 4.4.2031.107
Mac OS X 10.7 Lion	ISL Light 4.0.0 - 4.0.4
Mac OS X 10.6 Snow Leopard	ISL Light 4.0.0 - 4.0.4

Important: With macOS 10.14 Mojave, Apple and macOS 10.15 Catalina Apple introduced additional changes to its Security settings, which further affect the workflow when running ISL Online applications.

Please refer to the following topic for an explanation:

ISL Online programs compatibility with macOS 10.15 Catalina

ISL Online programs compatibility with macOS 10.14 Mojave

Linux

Linux kernel 2.4 and higher (64-bit)
glibc 2.12 or newer
systemd
X Window System

Tested on:

Ubuntu 16.04, 18.04, 20.04, 22.04
Debian 9, 10, 11, 12
CentOS 8

Not supported:

Wayland
Linux 32-bit
arm64 architecture

Note: ISL Light 4.0.4 for Linux was the last version to support 32-bit kernels.

Chrome OS

ISL Online provides remote viewing (but not remote control) of Chrome OS devices with the Android subsystem installed. On the other hand, Chrome OS users (with the Android subsystem installed) can access, view, and control any Windows, Mac, or Linux remote computer.

Mobile

iOS
Android

Internet Connection

Minimal bandwidth requirement: 56 Kbps

Bandwidth consumption during an audio/video call in ISL Light:

Video quality and mic/consumption	Network consumption resource manager [kb/s]	Network consumption net balancer [kb/s]
Video quality default high	21,5	23 - 62
Video quality default high + mic	25,5	20,5 - 69
Video quality snapshot high	13,2	10 - 12,5
Video quality snapshot medium	5,8 - 6,2	6 - 7
Video quality snapshot low	5,5	5,5 - 6,6
Mic only	3 - 4,5	7 - 8

Supported connection methods:

ISL Light can work with any of the following methods:

direct outgoing TCP/IP connection to TCP port 7615 on the ISL Conference Proxy server
WININET HTTPS connection to TCP port 443 on the ISL Conference Proxy server
WININET HTTP connection to TCP port 80 on the ISL Conference Proxy server
direct HTTPS connection to TCP port 443 on the ISL Conference Proxy server
direct HTTP connection to TCP port 80 on the ISL Conference Proxy server
Timeout for a specific connection method is 20 seconds for connection establishment, so the total timeout for connection is less than 1 minute.

Supported network types:

ISL Light supports any of the following:

a computer with a static public IP
a computer with a dynamic public IP
a computer in a private network behind a firewall with a public IP, performing NAT
a computer in a private network behind an HTTP proxy offering HTTP and/or HTTPS protocols

Supported connection types

ISL Online automatically selects the most effective connection type, either by establishing a session tunnel directly between the local and remote device (direct connection) or through a routed connection (standard connection).

Direct Connection

For direct connection to work, the following two domains must be accessible/whitelisted:

stun.cloudflare.com (port 3478/udp)
turn.cloudflare.com (port 3478/udp)

Standard Connection

For standard connection to work, no special configuration is needed. In case you are running ISL Light in a restricted environment, one of the Supported connection methods must be allowed for ISL Light to work.

ISL Light for Web

Supported minimum browser versions:

Chrome version 68
Edge version 79
Safari version 15.2
Firefox version 79 (Asynchronous Clipboard API fully supported in version 125)
Opera version 114
Chrome for Android version 131
Safari on iOS version 15.2
Samsung Internet version 15.0 (Asynchronous Clipboard API fully supported in version 25)
Opera Mobile version 80
Firefox for Android version 132

Browser API dependencies: