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If your monitoring station server has a TOE-enabled network card, you may need to disable it. TOE is intended to accelerate long-running TCP connections. Since up.time Because Uptime Infrastructure Monitor uses many short-lived connections to contact agents, its process can be mismanaged by the TOE. Please perform the following commands on the monitoring station to disable TOE:
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Windows TCP Stack is overloaded
If up.time Uptime Infrastructure Monitor is monitoring more than 500 services, you may find that the default Windows TCP stack options are not sufficient to maintain the outbound up.time Uptime Infrastructure Monitor connections. In this case, we recommend adjusting registry settings on the monitoring station to relieve some common TCP bottlenecks:
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- Value Name: MaxUserPort
- Value Type: REG_DWORD
- Value data: 65534
- Valid Range: 5000-65534 (decimal)
- Default: 0x1388 (5000 decimal)
Description Description: this parameter controls the maximum port number that is used when a program requests an available user port from the system.
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- Value Name: TcpTimedWaitDelay
- Value Type: REG_DWORD—time in seconds
- Value data: 30
- Valid Range: 30-300 (decimal)
- Default: 0xF0 (240 decimal)
Description Description: this parameter determines the length of time that a connection stays in the TIME_WAIT state when being closed. While a connection is in the TIME_WAIT state, the socket pair cannot be re-used.
This is also known as the 2MSL state because the value should be twice the maximum segment lifetime on the network. See RFC 793 for further details.
How to Disable TCP Chimney Offload
TCP Chimney Offload is a networking technology that helps transfer the workload from the CPU to a network adapter during network data transfer. In Windows Server 2008, TCP Chimney Offload enables the Windows networking subsystem to offload the processing of a TCP/IP connection to a network adapter that includes special support for TCP/IP offload processing.
Please review - Information about the TCP Chimney Offload for detailed explanation of what the TCP Chimney Offload is and instructions (including an option to run a wizard) to guide you through this change.
Related KB - Increasing Windows TCP socket limits