Session destroyed after post from different ip

1) read the server log files.
2) set the env file to CI_ENVIRONMENT = development for debugging, rename to .env.
3) turn on CodeIgniters logger set the threshold  t0 9.
4) hit F12 in your web browser to see what is going on console and network tabs.

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What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )