In certain situation where the ProxySG is still in staging mode and administrator is trying to install static route but fail.
One possibility here could be because the proxy is not directly connected to the gateway which these static routes is configured. Causing the installation to be rejected.
0:0 - 188.8.131.52
(All other interface are not connected)
Intended static route to be installed but fail.
10.10.10.1 255.255.255.0 184.108.40.206
So in this example as the proxy is not part of 172.1.100.x network the installation of static route would fail. So you got to assign the right IP to the interface prior to installing static route.