Hi, New to the board but have a background in website hosting and ipn from various providers. Firstly you want to check your settings in your paypal account are correct the ipn url specifically. I assume you have an api key and use that on your website. Go to your website settings and verify that they match. Assuming all is correct and no changes need to be made before this point you are going to have to do some digging here are some tips. look in your server logs, firstly check access logs should see logs for the callback from PayPal in there easily identifyable. check error logs for any errors from the script and fix any errors found. (No access logs points to a firewall port needing opening the firewall log should help to identify that by telling you it denied PayPal callback) if you see no access log entries (recent) or errors from the script you will need to look into how your website runs its backend, its common for shopping carts to use curl for a lot of the backend/api work which needs specific ports open in the firewall both inbound and outbound ports (these carts also usually have good logging with error codes to help identify the problem). this can be a big problem especially if your server is upated and the firewall config file is reset to default. Fix that issue, open ports for curl. I hope you get your problem sorted soon. Good luck.
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