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I am using Payment Data Transfer and I am attempting to use Paypal Sandbox for testing. It stopped working correctly but I haven't made any changes so it looks like the issue is on Paypal's end.
When I click on a subscription button it takes me to Sandbox Paypal where it offers me to create a paypal account or login with Paypal.
Choosing the login option, a warning screen is showned and indicates the following information:
"Your connection is not private Attackers might be trying to steal your information from www.sandbox3.paypal.com (for example, passwords, messages, or credit cards). NET::ERR_CERT_COMMON_NAME_INVALID This server could not prove that it is www.sandbox3.paypal.com; its security certificate is from www.sandbox.paypal.com. This may be caused by a miconfiguration or an attacker intercepting your connection. Proceed to www.sandbo3.paypal.com (unsafe)" .
If I tell chrome to proceed anyway it allows me to view the generic login in the following url: https://www.sandbox3.paypal.com/signin/?returnUri=https%3a%2f%2fwww%2esandbox3%2epaypal%2ecom%2fus%2... (note that the htpps:// is red and scratched).
After logging in, it takes me to "my account" and doesn't ask me to confirm the payment.
NOTE: Before the request error, this issue was already happening.
Here is a stackoverflow question showing the problem - https://stackoverflow.com/questions/44640024/paypal-sandbox-ssl-issue-redirect-issue/44652397
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The issue should be resolved now.
The domain will still show "sandbox3.paypal.com", but the invalid security certificate message should no longer appear and we'll resolve the incorrect domain name soon
Was my post helpful? If so, please give me a kudos!
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I'm with the same problem and the owner of that stack overflow topic told me that he contacted PayPal and they assumed its an error from them and they were trying to resolve it! But this was on June 20, no solution yet?? 8 days already. I can't test the website and client is getting mad
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I made a question in their support site www.paypal-techsupport.com and still no answer from them.
I can't test the website either and can't do the upgrade until this problem is solved!!!
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Any update?
One more morning where I had to cancel a meeting where I was supposed to show to the client the final product of the website

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@Alex_cp - Can you post the button code you are using, and also can you ping me the MTS ticket number please?
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@MTS_Ciaran, here is my button code:
<form method="post" target="_top" id="form_subscribe" ng-click="saveInvoiceInfo('paypal'); invoice_form.$submitted = true;"> <input type="hidden" name="cmd" value="_s-xclick"> <input type="hidden" name="hosted_button_id" value="{{hosted_id}}"> <input type="hidden" name="custom" value="{{invoice.actor_id}}_{{tax_id}}_{{buy_id}}"> <input type="image" src="https://www.paypalobjects.com/pt_PT/PT/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit" alt="PayPal - A forma mais fácil e segura de efetuar pagamentos online!"> <img alt="" border="0" src="https://www.paypalobjects.com/pt_PT/i/scr/pixel.gif" width="1" height="1" /> </form>
My MTS ticket number is 170621-000273 (Reference Number).
Thanks in advance!

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So this is working ok for me at the moment, no SSL connection no private error. If you havent already, can you try the aul clearing cache and cookies?
<snip>
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I just tried after clearing cache and cookies. Still the same... After clicking the login button, the "Your connection is not private" page still appears... And i can't make the payment...
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@MTS_Ciaran I'm sorry, could you remove the image, please? It's a private website that is still under development and should not be public 🙂

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