Every alternate Paypal IPN transaction is failing (HTTP code 400) -

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i have weird issue paypal ipn. every alternate transaction failing. let's if first transactions goes second 1 fails. if 3rd 1 goes 4th 1 fails. http status code getting failed transactions in ipn history 400. have implemented new paypal host header changes newly introduced them.

any idea why happening?

ipn history
http://i.imgur.com/nfqrsgi.png

ipn detail
http://i.imgur.com/hckdasw.png

edit
using php curl ipn work (using same sample code available on paypal website)

another edit
ok found code sample php 5.2 paypal site. 1 different 1 using. tested on paypal sandbox twice , worked. later on test on live see if working fine or not.

error 400 = bad request, means requests being made on application layer (by browser) may contain errors or transport layer (syn, syn, ack, syn) 3 way hand shack being interrupted. check pc mallware on safe side. netstat -b in dos , see what's trying connections external network.

also scan malware bytes , virus scanner eset nod32.. let know how on^^


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