Hi guys,
Thanks for you support. I solved the isses and the issues is management portal misconfigurations.
When I disable "PRVIENT LOGIN CSRF ATTACK" then it will work as expected.

Not Found

The requested URL /flynth/default.csp was not found on this server.

this is the issue im facing but the server contains csp.default.cls file

and its working on server 1 not working on server 2

I checked the both server management portal configuration and nothing is different

I try this but its not working.
I have an two server and my url is : http://localhost/test/default.csp
but I dont have the actual default.csp page in my both server insted i have the csp to cls converted code
ex: default.csp -> csp.default.cls

server 1 is working but server 2 shows page not found

Thanks for your support Robert.

But my issue is, I have an backup file when i restored it
server 1:
default.csp -> login.csp page are open
server 2:
default.csp -> login.csp (shows invalid action and its not point out the file)

I am using custom login page
and my server use the csp to cls converted pages. when I import the login.csp page it will work but csp.login.cls file not work