Parent topic: Performance tuning for IBM Content Navigator
Related information:
The error message "A connection cannot be established" is logged in the IBM® Content Navigator server log if there is no connection available between Content Manager OnDemand and its clients, such as IBM Content Navigator.
The "connection cannot be established" error might occur when all of the network ports are either occupied or in a TIME_WAIT state. The issue is most common with Microsoft Windows, where the default number of ports is low.
When the ports are occupied or in the TIME_WAIT state, no new socket connections can be made and the error is logged. You can use the netstat -an command to monitor the state and the number of network ports currently in use. The maximum number of ports that are configured in the environment is determined based on the platform. For example, for AIX®, use the no -p -a command to determine the maximum number of configured ports by subtracting the tcp_ephemeral_high and tcp_ephemeral_low values.
The solution to the connection error is to increase the maximum number of network ports that are allowed. You also can evaluate lowering the configured network TCP time wait delay.
