php - When form validation fails behind CloudFront, user is sent to root rather than back to form -


i have silverstripe website running on 2 servers behind load balancer, behind cloudfront. redis stores session information , have sync task syncs assets required. working fine.

i have form has various required fields. when form filled in correctly works fine , directs person correct place. if user misses field should redirect form. instead redirects them /. if click in browser takes me form , correct fields highlighted missing.

if test on local machine works expected. if fix myself 1 of servers in prod works fine, if switch between 2 servers manually.

i did in travels realise needed define load balancer in _ss_environment.php file:

define('ss_trusted_proxy_ips', 'x.x.x.x/16'); define('ss_trusted_proxy_ip_header', 'x-forwarded-for'); define('ss_trusted_proxy_protocol_header', 'x-forwarded-proto');

i couldn't find trusted_proxy defined in framework added 

define('trusted_proxy', '1');

as well.

however form still redirecting / when validation fails.

what going on? there other things i'm missing define lb?

edit

i've removed cloudfront (lb still in place) , it's working expected. i'd prefer put on unsure causing issue. far can tell thing needs forward phpsessid cookie, should there else?

for cloudfront have whitelist several headers. issue believe referer header.


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