Paypl IPN HTTP error code 403 and not sending IPN, invoice not getting marked as paid

[neoice]

Hi, I use Paypal basic module last 6/7 years without any issue.  its just last 1 week I am having issue with paypal IPN. It says HTTP error code 403 and its not sending any IPN to my site. All was working ok and I didnt do any recent change.  Also in my WHMCS Gateway log it says "IPN Handshake Invalid" and no info about payment. Of course invoice not getting marked as paid. I saw few months old post where it says update whmcs to 8.4 and also untick "Default to Client Area"......its already unticked and I am using latest WHMCS 8.5.1. Can anyone help me to understand or if anyone else having same issue while everything was working all good without any change in my site.

[Fran]

Hello,

 

Did you find a solution??? We are having the same issue recently.

 

Thanks.

[Evolve Web Hosting]

@neoice and @Fran have you checked this? https://docs.whmcs.com/PayPal_Basic#Charset_Configuration

[Fran]

13 hours ago, Evolve Web Hosting said:

@neoice and @Fran have you checked this? https://docs.whmcs.com/PayPal_Basic#Charset_Configuration

Yes, we have checked that both sides are utf-8, talked like 4 hours on the phone with PayPal, and no solution yet. Paypal did a full reset on my domain but need to wait 72 hours, my fingers are crossed now.

 

 

 

 

[Walther]

On 13/01/2024 at 7:22 PM, Fran said:

Yes, we have checked that both sides are utf-8, talked like 4 hours on the phone with PayPal, and no solution yet. Paypal did a full reset on my domain but need to wait 72 hours, my fingers are crossed now.

Did the full reset fix the issue?
I've been experiencing this very same issue since 15/1 ... and I just wrote my own post about it, with a few further details