Cryptographic hash BUG /Error

[Giladd]

Hi,

I could not find a solution on the forum, maybe Some one here can help.....
Most of the time the PayPal plug in is working just fine, but once or twice a week week I get this error, what seems to be IPN error. I am not a developer so I attach the error log that you can see for yourself.
Any help will be highly appreciated.

Thank you very much.

Best regards,
Gilad.


[attachment cleanup by admin]

[Giladd]

I open a case at PayPal support and i got this answer from them:

"I have checked our flow logs am I see that the issue with the language encryption is solved.
Also I see that for some transaction we receive a Validation_Result=Incorrect Signature;
which means that cryptographic hash we've stored for that IPN, doesn't mach one we receive back from your IPN listener.
You have to get in touch with your developer to check your IPN listener and see why it returns this Validation Result."

Any help from the Developers will be highly appreciated.

Thank you.