Not receiving any IPN messages from PayPal

[sandboxwoes]

Sandbox Merchant ID: <Removed>

IPN was working perfectly until August 18, then it just stopped.  All payment transactions are going through both the client and the business accounts, but there is nothing in the IPN history about any IPN message being sent. 

We have tested thoroughly, including resending an old IPN that had worked previously - nothing happened.  We have turned the IPN off and on again in Paypal sandbox.  

I see from previous posts that this was a known issue in February and July of 2020.  Is this happening again, or is there something we can do with this account to fix it?  Would creating a new sandbox account help?

[ck_bai]

The problem looks like fixed today? ipn notification arrived and works well.

[VA23]

It looks like the old IPN sandbox endpoint is no longer working again.

Instead of this:

https://ipnpb.sandbox.paypal.com/cgi-bin/webscr

Use this:

https://www.sandbox.paypal.com/cgi-bin/webscr

And it's working again. This was not the case a day ago as I tested both URLs when I noticed the IPNs were not coming through.

So not sure what changed?

[BerndOstermann]

Hello,

so how VA23 told:

yesterday I changed the Sanbox Endpoint 

from

https://ipnpb.sandbox.paypal.com/cgi-bin/webscr

to this:

https://www.sandbox.paypal.com/cgi-bin/webscr

Justin, could you confirm that the endpoint url has changed?

If so, where is this documented?

The Example Code hasn't changed.

https://github.com/paypal/ipn-code-samples/blob/master/php/PaypalIPN.php

So  the IPN Simulator now works fine. Befor I got an BAD REQUEST Error.

But that doesn't solve the problem, that no IPN messages are sent from PayPal.

Bernd

[sandboxwoes]

Hi all:

We were always using https://www.sandbox.paypal.com/cgi-bin/webscr 

We've given up on the sandbox, though, and are now testing on the live platform with prices set to just a few cents.  I must say I'm completely unimpressed with the sandbox and with the lack of support for this issue.

[MTS_Justin]

Hello,

You can use either of the endpoints for IPN validation.

"https://www.sandbox.paypal.com" or "https://ipnpb.sandbox.paypal.com". Both are always active, one did not replace another.

Due to an issue with IPN validation returning initially a HTTP 400 and now a HTTP 403 error with the "https://ipnpb.sandbox.paypal.com" endpoint, I recommended in another post where the issue was first reported to use "https://www.sandbox.paypal.com" for validation whilst we investigated the issue.

https://www.paypal-community.com/t5/Sandbox-Environment/Sandbox-ipn-validation-enpoint-returning-404...

Thanks !

[MTS_Justin]

Hello All,

This issue should now be resolved and IPN messages delivered as expected.

Apologies for any inconvenience caused and thanks for your patience as we worked to resolve this issue.

Thanks !

[ppazos]

I have just tested with both URLs, and NO, this one is NOT working, returning 400

https://ipnpb.sandbox.paypal.com/cgi-bin/webscr

This one works

https://www.sandbox.paypal.com/cgi-bin/webscr

[MTS_Justin]

Hello,

Thanks for the update.

I've asked the IPN team to take a look at this, as it was working when I posted the response above.

I'll revert back here once they've confirmed it's been resolved.

Thanks

[MTS_Justin]

Hello,

The IPN team have reviewed and found an issue and resolved it.

Thanks

[rjvj]

Hello,

my merchant id in sandbox is 4VEX8DNAVZ9BJ

I see the IPN message is sent to my IPN post back url. But, the PayPal response is empty when I receive it. It was working before (for a few years now) and not sure if something changed. However, IPN simulator is able to successfully post to my URL.

Our server supports TLS1.2 and when I open connection with PayPal, I get the following exception java.lang.ClassNotFoundException: com.ibm.jsse2.SSLSocketFactoryImpl; java.lang.ClassNotFoundException: com.ibm.jsse2.SSLSocketFactoryImpl

Here are the supported protocol versions - [TLSv1.3, TLSv1.2, TLSv1.1, TLSv1, SSLv3, SSLv2Hello]

When I run the TlsCheck.java, get inputstream from https://tlstest.paypal.com connection is empty (PayPal_Connection_OK message is not present). Please help. Let me know if any other information is needed.

Thanks.