first of all, i'm sorry for my bad english

greetings,

i'm using paypal as my payment gateway for my website development in my final project,

i'm using php as my language, codeigniter as my framework.

i'm having a problem with IPN thing. the problem is the last time i check, my ipn doesnt work.

when i check my ipn history, the result is "retrying", but when i checked with ipn simulator, my ipn works just fine, the result is complete and verifed.

im having  aproblem finding my mistakes. any help would be great. thank you all