Start/notes.ini Parameters/Server_MaxSessions

Server_MaxSessions

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Parameter: Server_MaxSessions
Short description: Maximum number of concurrently active NRPC sessions on the server.

Profile

Parameter
Server_MaxSessions
Category
Performance / Memory
Component
Server
Available since
R5
Supported versions
9.0.1, 10.0, 11.0, 12.0, 14.0, 14.5
GUI equivalent
Server document (Server Tasks → Limits)
Possible values
Integer, default ≈ 65535; 0 = no limit

Description

Server_MaxSessions defines how many active NRPC sessions the server may handle concurrently. A session typically bundles one NRPC connection of a Notes client or another Domino server (replicator, router, admin tools).
In contrast to Server_MaxUsers, which limits the number of distinct users, Server_MaxSessions limits the technical connections. The two values work together.

Example configuration

Server_MaxSessions=20000

Notes & pitfalls

  • The default is very high (≈65535) – on most servers it is not the limiting factor.
  • 0 disables the limit entirely (not recommended for internet-facing servers).
  • When the limit is reached, the server rejects new NRPC connections – users see connection errors.
  • Monitoring: show stat Server.Sessions, Server.Sessions.Peak.
  • Mis-sized in combination with cluster failover scenarios (failover load adds up).
  • Together with Server_Session_Timeout, it defines the lifecycle policy.