Hi Daryl,

I just tested this on my test portal and ite returning back fine from PayPal on success and cancel. The cart does send the success and cancel url to PayPal which takes precedence over what you enter at PayPal in your account although you still need to enter the url to your site in your paypal account. Also you need to have a PayPal business account in order for it to work. The following are some possibilities as to why the return form paypal is not working with your portal:

1. Firendly URLs are not enabled in your portal or you have a regex defined in your web config that is masking out the return from paypal

2. If you have ifinity URL Master installed there could be a configuration issue with URL rewriting

3. IIS/SSL Setup - you could have and issue with your IIS and/or SSL setup on your web server that is preventing the https return from PayPal. Also, in IIS you can configure URL redirection and rewriting that could be the cause of the issue as well

4. Firewall - There could be a rule in your firewall that is filtering, blocking or changing the return url from PayPal.

5. PayPal Config issue - Make sure you have a business or premium PayPal account. The regular standard accounts dont work. Make sure your PayPal account is configured properly and also the PayPal doc.

Lastly, I would try setting up a new dnn sandbox and installing cart v.4.52 on your desktop or laptop so you can see it working which should isolate the issue as being in the cart or your server/dnn portal setup.

Thanks,