Problem:

You receive an error, after synchronization or leaving Linnworks running for a some time.

A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)

Cause:

Client disconnects from the server and connection cannot be restored immediately. Server dumps all connections that do not respond in reasonable time or heavily throttled, in order to restore connection software restrat is required or even a PC reboot.

This is caused by the client side, for the following reasons:

PC went into sleep mode
Network card turned off - Power Saving
Router closed the inactive connection
Router buffer overflow (well known problem with BT and SKY routers, in fact most ISP's freebie routers are not designed for heavy internet use)

Solution:

(Instructions are for Windows 7)

Ensure PC is not turning off network card when going to sleep:

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Go to the Start Menu
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Select Control Panel
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Select 'Hardware and Sound'
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Under 'Power Options', select 'Change power-saving settings'

For the option that has been enabled, click on 'Change plan settings'

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Select 'Change advanced power settings.
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Click on the '+' to expand  'Wireless Adapter settings' or 'Network Adapter settings'

Click on the '+' to expand 'Power saving mode'

Change setting in drop down box to 'Maximum Performance' to prevent it being powered down.

Ensure Network adaptare power saving is turned off

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Open the Start Menu
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Right Click 'Computer' or 'My Computer'
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Select 'Manage', and say 'Yes' if asked for permission

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Click on 'Device Manager'
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Click on 'Network adapters'
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Select Network adapter in use
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Right click the adapter's entry, and select 'properties'

Select the tab labelled 'Power Management'

Ensure the option 'Allow the computer to turn off this device to save power' is not checked/enabled.

Ensure your router is a robust model, and has a Keep Alive setting on
Do not use any Free Antivirus/Firewall software