My /etc/ibm/sgenvironment.conf file has a ACL_FILE:
# Access Control List File
# If manually modifying the following, accepted values are the absolute path to your ACL files ('none' if no file, separated by '--' otherwise)
ACL_FILE=/home/snowch/securegateway_acl
What is the format of the ACL_FILE? Where can I find documentation on this?
I found it here in the end:
https://console.ng.bluemix.net/docs/services/SecureGateway/sg_010.html#sg_015
I'm adding an answer because I think it will be useful to other users: