Windows Scaling is enabled by default on Cacheflow.

It can be disabled by executing the *hidden* commands below:

CF3x5#conf t
Enter configuration commands, one per line.  End with CTRL-Z.

CF3x5#(config)tcp-ip rfc-1323 disable
  ok

CF3x5#(config)sh config
...
...
!- BEGIN networking
tcp-ip rfc-1323 disable
!- END networking
...

To re-enable Windows Scaling:

CF3x5#(config)tcp-ip rfc-1323 enable
  ok

CF3x5#(config)sh tcp-ip
...
...
!- BEGIN networking

!- END networking
...

Blue Coat recommends that RFC 1323 remains enabled in production environment because it improves performance, especially for large downloads. The only reason to toggle the RFC 1323 setting is for troubleshooting purpose and it should be re-enabled once troubleshooting is completed.