We are planning to release a fix for this issue in Version 9.202.
Similar issue appears if I try to run the WebAdmin on port 443, then I can not run web server protection on port 443 even though the WebAdmin is limited to internal lan only and the web server runs on an additional address only added to external interface.
All my web server protections are limited to specific additional IP addresses on external interface, so will 9.202 let me then enable SSO for transparent web proxy? Any idea when 9.202 will be available?