c1 cms - Failed to build preview for function. Reason: PhantomServerIncorrectRespons (C1ConsoleAccess.xml) -

we have internet facing instance of composite-c1 using qa'ing our site, , when try force https console access (forcehttps), functionpreview broken in page editor. there valid ssl cert on server. our side support https, it's not required public content.

<clientprotocol forcehttps="true" allowfallbacktohttp="false" customhttpsportnumber="" /> 

we seeing these errors in c1 logs

failed build preview function. reason: phantomserverincorrectresponse; output: error, page.open: fail

shutting down phantomjs server. reason: phantomserverincorrectresponse, output: error, page.open: fail

setting forcehttps="false" in ~/app_data/composite/configuration/c1consoleaccess.xml file along server restart bring functionpreview.

any debugging tips?

with release of composite c1 5.1, surgically pulled out updated version of phantomjs.exe , copied on our c1 5.0 deployment. appears fix problems experiencing.

phantonjs.exe

old version: 1.9.7.0

new version: 2.1.1.1

folder: /app_data/composite/phantomjs