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Paypal IPN not working on one server

Beta server works "VERIFIED", production server doesn't work

     
9:50 pm on Jul 14, 2014 (gmt 0)

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Hi webmasters we are currently developing a paypal integration for a client and after following the documentation we found it doesn't work as expected.

We have 2 servers:
  1. Server A is our testing server
  2. Server B is the production server (not ours)
  3. Both have php, mysql etc.


Both servers work regarding sending the notification to Paypal and both receive the IPN notification (and send it back). Both servers are running the same scripts and both receive the post values/keys.

BUT... the production server is missing the "VERIFIED" value. There are several verifies but that server misses the most important (empty string). After some research we found the only difference is the PHP versions. Server A: 5.2.17 while the production server has 5.3.10. Could that be the issue?

We already researched all the pending points even called Paypal and they were clueless even hanged up. Any help will be appreciated.
6:24 pm on July 17, 2014 (gmt 0)

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Everthing was perfect, someone closed one port...