CSS - problems copying files from mapped drives

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May 20th, 2008
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We're having problems copying large files (> 3.5 GB) between a server in front of and behind the CSS.

On the server behind the CSS (let's say, the user maps a drive \\\c$, finds the file he wishes to copy, and initiates the transfer. After about 5 minutes an error pops up saying "The Volume is no Longer Available".

In the past I've experienced extreme slowness when copying via SMB through the CSS but never pursued it. Any thoughts?

Outbound traffic hits group rule:

group from-server1

vip address

add service server1-any


service server1-any

ip address


Does the server outside the CSS ever need to initiate communication to the load balanced server in order for this to work?



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Gilles Dufour Tue, 05/20/2008 - 08:59
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  • Cisco Employee,

All I can think of is flow timeout.

If you have a gap of a few sec between 2 packets, the CSS will consider the connection dead and will sooner or later kill it - not immediately which is what is confusing a lot of people.

Try to configure a 'flow-timeout-multiplier 20' under the group.

we'll need the complete config, server's ip's and a sniffer trace of frontend and backend.


joe.arnstein Tue, 05/20/2008 - 09:46
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I added the flow timeout multiplier and will have the user test it out.



joe.arnstein Tue, 05/20/2008 - 12:41
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Hey Giles,

So far we're able to copy the file! I'll try to reply again tomorrow after further testing.



joe.arnstein Thu, 05/22/2008 - 06:45
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Thanks, Gilles. Seems to work! Now that I see this, there have been a few other applications that might have been malfunctioning because of the same problem! I better make some phone calls...



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