After upgrading to ProxySG or Advanced Secure Gateway 6.7.4.x, the administrator would get logout of the Management Console and an error "Error connecting to SG" would show whenever the Home link is clicked.
"Error connecting to SG"
Proxy SG and Advanced Secure Gateway 6.7.4.x
This issue has been identified as bug SG-1693.
A workaround is to avoid using the Home link for now and use the Overview button instead.