Description
This article explains how to disable TCP window scaling with FortiMail v4.0.
FortiMail v3.0 had a CLI command to modify the Linux sysctl variables.
Scope
FortiMail v4.0 MR3
Solution
In FortiMail v4.0 there is no command to modify these variables however in some instances TCP window scaling might have to be disabled.
To disable TCP window scaling, connect to the CLI of the FortiMail and run the following CLI command:
config system kernel
edit sys.net.ipv4.tcp_window_scaling
set value 0
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