Attention! This menu item is accessible in BitrixVA/BitrixEnv starting from version 7.1.0.
Push-server (Pulling-server, Instant messages server) is designed for fast exchange of messages between users, who enter the portal via browser or get connected via desktop or mobile applications.
Nginx-PushStreamModule module is used by default for Push&Pull server in BitrixVA/BitrixEnv. Its main drawback: if the service is offline, then the undelivered messages get lost, which creates a high load on the PHP-backend due to the specifics of Nginx module operation. New module, based on NodeJS does not have these drawbacks.