Preflight CORS request fail on some versions of Firefox -


using firefox 45.8.0 esr on windows.

trying load https://secure.scheduleonce.com/dana

the page doesn't load, , in network panel see crossed padlock icon instead of green padlock icon request: 

options https://cfproxy.scheduleonce.com/get-data/getlandingpagelayout

when floating on padlock see following message:

the connection used fetch request not secure.

the page loads fine on chrome / safari / ie , more recent version of ff.

is there way debug what's wrong request resource ? ff doesn't give me information went wrong.

i suspect might related fact it's preflight cors request (the requested domain different hosted page domain).

attaching har file of network : https://www.dropbox.com/s/i59k66a2w8p3ast/archive%2017-09-10%2007-06-15.har?dl=0

can viewer here: (https://toolbox.googleapps.com/apps/har_analyzer)

thanks.

problem cipher suite choice on server.

i used site change it: https://mozilla.github.io/server-side-tls/ssl-config-generator/

to support older browsers well.

i don't know in ff 45.8.0 esr made not respect security of server.


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