Orbix active connection management (ACM) lets servers scale up to large numbers of clients without encountering connection limits. Using active connection management, Orbix recycles least recently used connections as new connections are required. You can control active connection management in Orbix with configuration variables, that specify the maximum number of incoming and outgoing client-server connections. Two settings are available for both client-side and server-side connections:
- A hard limit specifies the number of connections beyond which no new connections are permitted.
- A soft limit specifies the number of connections at which Orbix begins closing connections.

Active Connection Management in Orbix can be configured through the following configuration variables:

plugins:iiop:incoming_connections:hard_limit specifies the maximum number of incoming (server-side) connections permitted to IIOP. IIOP does not accept new connections above this limit. Defaults to -1 (disabled).

plugins:iiop:outgoing_connections:hard_limit sets the maximum number of outgoing (client-side) connections permitted to IIOP. IIOP does not allow new outgoing connections above this limit. Defaults to -1 (disabled).

plugins:iiop:incoming_connections:soft_limit sets the number of connections at which IIOP begins closing incoming (server-side) connections. Defaults to -1 (disabled).

plugins:iiop:outgoing_connections:soft_limit specifies the number of connections at which IIOP begins closing outgoing (client-side) connections. Defaults to -1 (disabled).