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| - | TCP/UDP/IP/Large Send/Large Receive/etc Offload tasks have been known to cause significant performance degradation as load increases on Windows 2003 and Windows 2008 servers running any Cisco Unified Contact Center software.
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| - | Cisco has released a number of field notices regarding these issues and steps to address the settings.
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| - | Windows 2003:
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| - | Here is the collated recommendations for Windows 2003 SP2 servers if they are part of a Contact Centre deployment.
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| - | *NIC Device driver updated to latest version
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| - | *KB948496 downloaded and installed and server rebooted
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| - | *Disable RSS and TCP Offload in the network adapter driver, with these steps:
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| - | *Click Start, click Run, type ncpa.cpl, and then click OK.
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| - | *Right-click a network adapter object, and then click Properties.
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| - | *Click Configure, and then click the Advanced tab.
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| - | *In the Property list, click Receive Side Scaling, click Disable in the Value list, and then click OK.
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| - | *In the Property list, click TCP/IP Offload (IPv4 Checksum Offload), click Disable in the Value list, and then click OK.
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| - | *Repeat steps for Public and Private interfaces.
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| - | *Check the registry to confirm settings applied after KB patch
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| - | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
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| - | EnableTCPChimney = 0
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| - | EnableRSS = 0
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| - | EnableTCPA = 0
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| - | *Add the following key in the registry to globally disable TCP Offload
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| - | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
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| - | New dword DisableTaskOffload = 1
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| - | *Reboot the server again and check settings in TCP
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| - | These have shown to provide a significant improvment in buffering and latency issues across private network links.
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| - | or Windows 2008, please check the following link for TCP offload settings.
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| - | http://support.microsoft.com/kb/951037
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| - | [[Category:Unified_Contact_Center_Enterprise]]
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