php - How to debug ERR_CONNECTION_TIMED_OUT -

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i trying build site saves (checkbox) value using php txtfile. , worked fine. however, i'm rearranging files on server in order make easier later create more.

i think rewrote path's files right (including fopen(_ dir _ . 'pathname')), when im changing checkbox (wich form submits on-click) "err_connection_timed_out" error , site links error page of host.

my question is, how can debug error? via console cant find error's , it's not giving me information missing links or files on server.

thanks in advance help.


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